3.25.4 html 1487 957 1 true 357 0 false 11 false false R1.htm 0000001 - Document - Document and Entity Information Sheet http://www.telefonica.com.br/role/DocumentandEntityInformation Document and Entity Information Cover 1 false false R2.htm 0000002 - Document - Audit Information Sheet http://www.telefonica.com.br/role/AuditInformation Audit Information Cover 2 false false R3.htm 9952151 - Statement - Consolidated Balance Sheets Sheet http://www.telefonica.com.br/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 3 false false R4.htm 9952152 - Statement - Consolidated Statements of Income Sheet http://www.telefonica.com.br/role/ConsolidatedStatementsofIncome Consolidated Statements of Income Statements 4 false false R5.htm 9952153 - Statement - Consolidated Statements of Other Comprehensive Income Sheet http://www.telefonica.com.br/role/ConsolidatedStatementsofOtherComprehensiveIncome Consolidated Statements of Other Comprehensive Income Statements 5 false false R6.htm 9952154 - Statement - Consolidated Statements of Changes in Equity Sheet http://www.telefonica.com.br/role/ConsolidatedStatementsofChangesinEquity Consolidated Statements of Changes in Equity Statements 6 false false R7.htm 9952155 - Statement - Consolidated Statements of Cash Flows Sheet http://www.telefonica.com.br/role/ConsolidatedStatementsofCashFlows Consolidated Statements of Cash Flows Statements 7 false false R8.htm 9952156 - Disclosure - Insider Trading Policies and Procedures Sheet http://www.telefonica.com.br/role/InsiderTradingPoliciesandProcedures Insider Trading Policies and Procedures Notes 8 false false R9.htm 9952157 - Disclosure - Cybersecurity Sheet http://www.telefonica.com.br/role/Cybersecurity Cybersecurity Notes 9 false false R10.htm 9952158 - Disclosure - OPERATIONS Sheet http://www.telefonica.com.br/role/OPERATIONS OPERATIONS Notes 10 false false R11.htm 9952159 - Disclosure - BASIS OF PREPARATION AND PRESENTATION OF FINANCIAL STATEMENTS Sheet http://www.telefonica.com.br/role/BASISOFPREPARATIONANDPRESENTATIONOFFINANCIALSTATEMENTS BASIS OF PREPARATION AND PRESENTATION OF FINANCIAL STATEMENTS Notes 11 false false R12.htm 9952160 - Disclosure - CASH AND CASH EQUIVALENTS Sheet http://www.telefonica.com.br/role/CASHANDCASHEQUIVALENTS CASH AND CASH EQUIVALENTS Notes 12 false false R13.htm 9952161 - Disclosure - FINANCIAL INVESTMENTS Sheet http://www.telefonica.com.br/role/FINANCIALINVESTMENTS FINANCIAL INVESTMENTS Notes 13 false false R14.htm 9952162 - Disclosure - TRADE ACCOUNTS RECEIVABLE Sheet http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLE TRADE ACCOUNTS RECEIVABLE Notes 14 false false R15.htm 9952163 - Disclosure - INVENTORIES Sheet http://www.telefonica.com.br/role/INVENTORIES INVENTORIES Notes 15 false false R16.htm 9952164 - Disclosure - PREPAID EXPENSES Sheet http://www.telefonica.com.br/role/PREPAIDEXPENSES PREPAID EXPENSES Notes 16 false false R17.htm 9952165 - Disclosure - INCOME AND SOCIAL CONTRIBUTION TAXES Sheet http://www.telefonica.com.br/role/INCOMEANDSOCIALCONTRIBUTIONTAXES INCOME AND SOCIAL CONTRIBUTION TAXES Notes 17 false false R18.htm 9952166 - Disclosure - TAXES, CHARGES AND CONTRIBUTIONS RECOVERABLE Sheet http://www.telefonica.com.br/role/TAXESCHARGESANDCONTRIBUTIONSRECOVERABLE TAXES, CHARGES AND CONTRIBUTIONS RECOVERABLE Notes 18 false false R19.htm 9952167 - Disclosure - JUDICIAL DEPOSITS AND GARNISHMENTS Sheet http://www.telefonica.com.br/role/JUDICIALDEPOSITSANDGARNISHMENTS JUDICIAL DEPOSITS AND GARNISHMENTS Notes 19 false false R20.htm 9952168 - Disclosure - OTHER ASSETS Sheet http://www.telefonica.com.br/role/OTHERASSETS OTHER ASSETS Notes 20 false false R21.htm 9952169 - Disclosure - INVESTMENTS Sheet http://www.telefonica.com.br/role/INVESTMENTS INVESTMENTS Notes 21 false false R22.htm 9952170 - Disclosure - PROPERTY, PLANT AND EQUIPMENT Sheet http://www.telefonica.com.br/role/PROPERTYPLANTANDEQUIPMENT PROPERTY, PLANT AND EQUIPMENT Notes 22 false false R23.htm 9952171 - Disclosure - INTANGIBLE ASSETS Sheet http://www.telefonica.com.br/role/INTANGIBLEASSETS INTANGIBLE ASSETS Notes 23 false false R24.htm 9952172 - Disclosure - IMPAIRMENT OF NON-FINANCIAL ASSETS Sheet http://www.telefonica.com.br/role/IMPAIRMENTOFNONFINANCIALASSETS IMPAIRMENT OF NON-FINANCIAL ASSETS Notes 24 false false R25.htm 9952173 - Disclosure - PERSONNEL, SOCIAL CHARGES AND BENEFITS Sheet http://www.telefonica.com.br/role/PERSONNELSOCIALCHARGESANDBENEFITS PERSONNEL, SOCIAL CHARGES AND BENEFITS Notes 25 false false R26.htm 9952174 - Disclosure - TRADE ACCOUNTS PAYABLE Sheet http://www.telefonica.com.br/role/TRADEACCOUNTSPAYABLE TRADE ACCOUNTS PAYABLE Notes 26 false false R27.htm 9952175 - Disclosure - TAXES, CHARGES AND CONTRIBUTIONS PAYABLE Sheet http://www.telefonica.com.br/role/TAXESCHARGESANDCONTRIBUTIONSPAYABLE TAXES, CHARGES AND CONTRIBUTIONS PAYABLE Notes 27 false false R28.htm 9952176 - Disclosure - DIVIDENDS AND INTEREST ON EQUITY Sheet http://www.telefonica.com.br/role/DIVIDENDSANDINTERESTONEQUITY DIVIDENDS AND INTEREST ON EQUITY Notes 28 false false R29.htm 9952177 - Disclosure - PROVISION AND CONTINGENCIES Sheet http://www.telefonica.com.br/role/PROVISIONANDCONTINGENCIES PROVISION AND CONTINGENCIES Notes 29 false false R30.htm 9952178 - Disclosure - PROVISION AND CONTINGENCIES Sheet http://www.telefonica.com.br/role/PROVISIONANDCONTINGENCIES_1 PROVISION AND CONTINGENCIES Notes 30 false false R31.htm 9952179 - Disclosure - LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY Sheet http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANY LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY Notes 31 false false R32.htm 9952180 - Disclosure - DEFERRED INCOME Sheet http://www.telefonica.com.br/role/DEFERREDINCOME DEFERRED INCOME Notes 32 false false R33.htm 9952181 - Disclosure - OTHER LIABILITIES Sheet http://www.telefonica.com.br/role/OTHERLIABILITIES OTHER LIABILITIES Notes 33 false false R34.htm 9952182 - Disclosure - EQUITY Sheet http://www.telefonica.com.br/role/EQUITY EQUITY Notes 34 false false R35.htm 9952183 - Disclosure - NET OPERATING REVENUE Sheet http://www.telefonica.com.br/role/NETOPERATINGREVENUE NET OPERATING REVENUE Notes 35 false false R36.htm 9952184 - Disclosure - OPERATING COSTS AND EXPENSES Sheet http://www.telefonica.com.br/role/OPERATINGCOSTSANDEXPENSES OPERATING COSTS AND EXPENSES Notes 36 false false R37.htm 9952185 - Disclosure - OTHER OPERATING INCOME, NET (EXPENSES) Sheet http://www.telefonica.com.br/role/OTHEROPERATINGINCOMENETEXPENSES OTHER OPERATING INCOME, NET (EXPENSES) Notes 37 false false R38.htm 9952186 - Disclosure - FINANCIAL INCOME (EXPENSES) Sheet http://www.telefonica.com.br/role/FINANCIALINCOMEEXPENSES FINANCIAL INCOME (EXPENSES) Notes 38 false false R39.htm 9952187 - Disclosure - BALANCES AND TRANSACTIONS WITH RELATED PARTIES Sheet http://www.telefonica.com.br/role/BALANCESANDTRANSACTIONSWITHRELATEDPARTIES BALANCES AND TRANSACTIONS WITH RELATED PARTIES Notes 39 false false R40.htm 9952188 - Disclosure - PENSION PLANS AND OTHER POST-EMPLOYMENT BENEFITS Sheet http://www.telefonica.com.br/role/PENSIONPLANSANDOTHERPOSTEMPLOYMENTBENEFITS PENSION PLANS AND OTHER POST-EMPLOYMENT BENEFITS Notes 40 false false R41.htm 9952189 - Disclosure - SHARE-BASED PAYMENT PLANS Sheet http://www.telefonica.com.br/role/SHAREBASEDPAYMENTPLANS SHARE-BASED PAYMENT PLANS Notes 41 false false R42.htm 9952190 - Disclosure - FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT Sheet http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENT FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT Notes 42 false false R43.htm 9952191 - Disclosure - ADDITIONAL INFORMATION ON CASH FLOWS Sheet http://www.telefonica.com.br/role/ADDITIONALINFORMATIONONCASHFLOWS ADDITIONAL INFORMATION ON CASH FLOWS Notes 43 false false R44.htm 9952192 - Disclosure - CONTRACTUAL COMMITMENTS AND GUARANTEES Sheet http://www.telefonica.com.br/role/CONTRACTUALCOMMITMENTSANDGUARANTEES CONTRACTUAL COMMITMENTS AND GUARANTEES Notes 44 false false R45.htm 9952193 - Disclosure - OTHER MATTERS Sheet http://www.telefonica.com.br/role/OTHERMATTERS OTHER MATTERS Notes 45 false false R46.htm 9952194 - Disclosure - SUBSEQUENT EVENTS Sheet http://www.telefonica.com.br/role/SUBSEQUENTEVENTS SUBSEQUENT EVENTS Notes 46 false false R47.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 47 false false R48.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 48 false false R49.htm 9955511 - Disclosure - Cash And Cash Equivalents (Policies) Sheet http://www.telefonica.com.br/role/CashAndCashEquivalentsPolicies Cash And Cash Equivalents (Policies) Policies 49 false false R50.htm 9955512 - Disclosure - TRADE ACCOUNTS RECEIVABLE (Policies) Sheet http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLEPolicies TRADE ACCOUNTS RECEIVABLE (Policies) Policies 50 false false R51.htm 9955513 - Disclosure - Subclassifications of assets, liabilities and equities (Policies) Sheet http://www.telefonica.com.br/role/SubclassificationsofassetsliabilitiesandequitiesPolicies Subclassifications of assets, liabilities and equities (Policies) Policies 51 false false R52.htm 9955514 - Disclosure - INCOME AND SOCIAL CONTRIBUTION TAXES (Policies) Sheet http://www.telefonica.com.br/role/INCOMEANDSOCIALCONTRIBUTIONTAXESPolicies INCOME AND SOCIAL CONTRIBUTION TAXES (Policies) Policies 52 false false R53.htm 9955515 - Disclosure - INVESTMENTS (Policies) Sheet http://www.telefonica.com.br/role/INVESTMENTSPolicies INVESTMENTS (Policies) Policies 53 false false R54.htm 9955516 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Policies) Sheet http://www.telefonica.com.br/role/PROPERTYPLANTANDEQUIPMENTPolicies PROPERTY, PLANT AND EQUIPMENT (Policies) Policies 54 false false R55.htm 9955517 - Disclosure - INTANGIBLE ASSETS (Policies) Sheet http://www.telefonica.com.br/role/INTANGIBLEASSETSPolicies INTANGIBLE ASSETS (Policies) Policies 55 false false R56.htm 9955518 - Disclosure - IMPAIRMENT OF NON-FINANCIAL ASSETS (Policies) Sheet http://www.telefonica.com.br/role/IMPAIRMENTOFNONFINANCIALASSETSPolicies IMPAIRMENT OF NON-FINANCIAL ASSETS (Policies) Policies 56 false false R57.htm 9955519 - Disclosure - PERSONNEL, SOCIAL CHARGES AND BENEFITS (Policies) Sheet http://www.telefonica.com.br/role/PERSONNELSOCIALCHARGESANDBENEFITSPolicies PERSONNEL, SOCIAL CHARGES AND BENEFITS (Policies) Policies 57 false false R58.htm 9955520 - Disclosure - Financial Services, Banking and Thrift (Policies) Sheet http://www.telefonica.com.br/role/FinancialServicesBankingandThriftPolicies Financial Services, Banking and Thrift (Policies) Policies 58 false false R59.htm 9955521 - Disclosure - DIVIDENDS AND INTEREST ON EQUITY (Policies) Sheet http://www.telefonica.com.br/role/DIVIDENDSANDINTERESTONEQUITYPolicies DIVIDENDS AND INTEREST ON EQUITY (Policies) Policies 59 false false R60.htm 9955522 - Disclosure - PROVISION AND CONTINGENCIES (Policies) Sheet http://www.telefonica.com.br/role/PROVISIONANDCONTINGENCIESPolicies PROVISION AND CONTINGENCIES (Policies) Policies 60 false false R61.htm 9955523 - Disclosure - LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Policies) Sheet http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYPolicies LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Policies) Policies 61 false false R62.htm 9955524 - Disclosure - NET OPERATING REVENUE (Policies) Sheet http://www.telefonica.com.br/role/NETOPERATINGREVENUEPolicies NET OPERATING REVENUE (Policies) Policies 62 false false R63.htm 9955525 - Disclosure - FINANCIAL INCOME (Policies) Sheet http://www.telefonica.com.br/role/FINANCIALINCOMEPolicies FINANCIAL INCOME (Policies) Policies 63 false false R64.htm 9955526 - Disclosure - PENSION PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Policies) Sheet http://www.telefonica.com.br/role/PENSIONPLANSANDOTHERPOSTEMPLOYMENTBENEFITSPolicies PENSION PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Policies) Policies 64 false false R65.htm 9955527 - Disclosure - FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Policies) Sheet http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTPolicies FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Policies) Policies 65 false false R66.htm 9955528 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING PRACTICES (Policies) Sheet http://www.telefonica.com.br/role/SUMMARYOFSIGNIFICANTACCOUNTINGPRACTICESPolicies SUMMARY OF SIGNIFICANT ACCOUNTING PRACTICES (Policies) Policies 66 false false R67.htm 9955529 - Disclosure - Operations (Tables) Sheet http://www.telefonica.com.br/role/OperationsTables Operations (Tables) Tables 67 false false R68.htm 9955530 - Disclosure - CASH AND CASH EQUIVALENTS (Tables) Sheet http://www.telefonica.com.br/role/CASHANDCASHEQUIVALENTSTables CASH AND CASH EQUIVALENTS (Tables) Tables http://www.telefonica.com.br/role/CASHANDCASHEQUIVALENTS 68 false false R69.htm 9955531 - Disclosure - FINANCIAL INVESTMENTS (Tables) Sheet http://www.telefonica.com.br/role/FINANCIALINVESTMENTSTables FINANCIAL INVESTMENTS (Tables) Tables http://www.telefonica.com.br/role/FINANCIALINVESTMENTS 69 false false R70.htm 9955532 - Disclosure - TRADE ACCOUNTS RECEIVABLE (Tables) Sheet http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLETables TRADE ACCOUNTS RECEIVABLE (Tables) Tables http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLE 70 false false R71.htm 9955533 - Disclosure - INVENTORIES (Tables) Sheet http://www.telefonica.com.br/role/INVENTORIESTables INVENTORIES (Tables) Tables http://www.telefonica.com.br/role/INVENTORIES 71 false false R72.htm 9955534 - Disclosure - PREPAID EXPENSES (Tables) Sheet http://www.telefonica.com.br/role/PREPAIDEXPENSESTables PREPAID EXPENSES (Tables) Tables http://www.telefonica.com.br/role/PREPAIDEXPENSES 72 false false R73.htm 9955535 - Disclosure - INCOME AND SOCIAL CONTRIBUTION TAXES (Tables) Sheet http://www.telefonica.com.br/role/INCOMEANDSOCIALCONTRIBUTIONTAXESTables INCOME AND SOCIAL CONTRIBUTION TAXES (Tables) Tables http://www.telefonica.com.br/role/INCOMEANDSOCIALCONTRIBUTIONTAXES 73 false false R74.htm 9955536 - Disclosure - TAXES, CHARGES AND CONTRIBUTIONS RECOVERABLE (Tables) Sheet http://www.telefonica.com.br/role/TAXESCHARGESANDCONTRIBUTIONSRECOVERABLETables TAXES, CHARGES AND CONTRIBUTIONS RECOVERABLE (Tables) Tables http://www.telefonica.com.br/role/TAXESCHARGESANDCONTRIBUTIONSRECOVERABLE 74 false false R75.htm 9955537 - Disclosure - JUDICIAL DEPOSITS AND GARNISHMENTS (Tables) Sheet http://www.telefonica.com.br/role/JUDICIALDEPOSITSANDGARNISHMENTSTables JUDICIAL DEPOSITS AND GARNISHMENTS (Tables) Tables http://www.telefonica.com.br/role/JUDICIALDEPOSITSANDGARNISHMENTS 75 false false R76.htm 9955538 - Disclosure - OTHER ASSETS (Tables) Sheet http://www.telefonica.com.br/role/OTHERASSETSTables OTHER ASSETS (Tables) Tables http://www.telefonica.com.br/role/OTHERASSETS 76 false false R77.htm 9955539 - Disclosure - INVESTMENTS (Tables) Sheet http://www.telefonica.com.br/role/INVESTMENTSTables INVESTMENTS (Tables) Tables http://www.telefonica.com.br/role/INVESTMENTS 77 false false R78.htm 9955540 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Tables) Sheet http://www.telefonica.com.br/role/PROPERTYPLANTANDEQUIPMENTTables PROPERTY, PLANT AND EQUIPMENT (Tables) Tables http://www.telefonica.com.br/role/PROPERTYPLANTANDEQUIPMENT 78 false false R79.htm 9955541 - Disclosure - INTANGIBLE ASSETS (Tables) Sheet http://www.telefonica.com.br/role/INTANGIBLEASSETSTables INTANGIBLE ASSETS (Tables) Tables http://www.telefonica.com.br/role/INTANGIBLEASSETS 79 false false R80.htm 9955542 - Disclosure - PERSONNEL, SOCIAL CHARGES AND BENEFITS (Tables) Sheet http://www.telefonica.com.br/role/PERSONNELSOCIALCHARGESANDBENEFITSTables PERSONNEL, SOCIAL CHARGES AND BENEFITS (Tables) Tables http://www.telefonica.com.br/role/PERSONNELSOCIALCHARGESANDBENEFITS 80 false false R81.htm 9955543 - Disclosure - TRADE ACCOUNTS PAYABLE (Tables) Sheet http://www.telefonica.com.br/role/TRADEACCOUNTSPAYABLETables TRADE ACCOUNTS PAYABLE (Tables) Tables http://www.telefonica.com.br/role/TRADEACCOUNTSPAYABLE 81 false false R82.htm 9955544 - Disclosure - TAXES, CHARGES AND CONTRIBUTIONS PAYABLE (Tables) Sheet http://www.telefonica.com.br/role/TAXESCHARGESANDCONTRIBUTIONSPAYABLETables TAXES, CHARGES AND CONTRIBUTIONS PAYABLE (Tables) Tables http://www.telefonica.com.br/role/TAXESCHARGESANDCONTRIBUTIONSRECOVERABLE 82 false false R83.htm 9955545 - Disclosure - DIVIDENDS AND INTEREST ON EQUITY (Tables) Sheet http://www.telefonica.com.br/role/DIVIDENDSANDINTERESTONEQUITYTables DIVIDENDS AND INTEREST ON EQUITY (Tables) Tables http://www.telefonica.com.br/role/DIVIDENDSANDINTERESTONEQUITY 83 false false R84.htm 9955546 - Disclosure - PROVISION AND CONTINGENCIES (Tables) Sheet http://www.telefonica.com.br/role/PROVISIONANDCONTINGENCIESTables PROVISION AND CONTINGENCIES (Tables) Tables http://www.telefonica.com.br/role/PROVISIONANDCONTINGENCIES 84 false false R85.htm 9955547 - Disclosure - PROVISION AND CONTINGENCIES (Tables) Sheet http://www.telefonica.com.br/role/PROVISIONANDCONTINGENCIESTables_1 PROVISION AND CONTINGENCIES (Tables) Tables http://www.telefonica.com.br/role/PROVISIONANDCONTINGENCIES 85 false false R86.htm 9955548 - Disclosure - LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Tables) Sheet http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYTables LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Tables) Tables http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANY 86 false false R87.htm 9955549 - Disclosure - DEFERRED INCOME (Tables) Sheet http://www.telefonica.com.br/role/DEFERREDINCOMETables DEFERRED INCOME (Tables) Tables http://www.telefonica.com.br/role/DEFERREDINCOME 87 false false R88.htm 9955550 - Disclosure - OTHER LIABILITIES (Tables) Sheet http://www.telefonica.com.br/role/OTHERLIABILITIESTables OTHER LIABILITIES (Tables) Tables http://www.telefonica.com.br/role/OTHERLIABILITIES 88 false false R89.htm 9955551 - Disclosure - EQUITY (Tables) Sheet http://www.telefonica.com.br/role/EQUITYTables EQUITY (Tables) Tables http://www.telefonica.com.br/role/EQUITY 89 false false R90.htm 9955552 - Disclosure - NET OPERATING REVENUE (Tables) Sheet http://www.telefonica.com.br/role/NETOPERATINGREVENUETables NET OPERATING REVENUE (Tables) Tables http://www.telefonica.com.br/role/NETOPERATINGREVENUE 90 false false R91.htm 9955553 - Disclosure - OPERATING COSTS AND EXPENSES (Tables) Sheet http://www.telefonica.com.br/role/OPERATINGCOSTSANDEXPENSESTables OPERATING COSTS AND EXPENSES (Tables) Tables http://www.telefonica.com.br/role/OPERATINGCOSTSANDEXPENSES 91 false false R92.htm 9955554 - Disclosure - OTHER OPERATING INCOME, NET (Tables) Sheet http://www.telefonica.com.br/role/OTHEROPERATINGINCOMENETTables OTHER OPERATING INCOME, NET (Tables) Tables http://www.telefonica.com.br/role/OTHEROPERATINGINCOMENETEXPENSES 92 false false R93.htm 9955555 - Disclosure - FINANCIAL INCOME (EXPENSES) (Tables) Sheet http://www.telefonica.com.br/role/FINANCIALINCOMEEXPENSESTables FINANCIAL INCOME (EXPENSES) (Tables) Tables http://www.telefonica.com.br/role/FINANCIALINCOMEEXPENSES 93 false false R94.htm 9955556 - Disclosure - BALANCES AND TRANSACTIONS WITH RELATED PARTIES (Tables) Sheet http://www.telefonica.com.br/role/BALANCESANDTRANSACTIONSWITHRELATEDPARTIESTables BALANCES AND TRANSACTIONS WITH RELATED PARTIES (Tables) Tables http://www.telefonica.com.br/role/BALANCESANDTRANSACTIONSWITHRELATEDPARTIES 94 false false R95.htm 9955557 - Disclosure - PENSION PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Tables) Sheet http://www.telefonica.com.br/role/PENSIONPLANSANDOTHERPOSTEMPLOYMENTBENEFITSTables PENSION PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Tables) Tables http://www.telefonica.com.br/role/PENSIONPLANSANDOTHERPOSTEMPLOYMENTBENEFITS 95 false false R96.htm 9955558 - Disclosure - SHARE-BASED PAYMENT PLANS (Tables) Sheet http://www.telefonica.com.br/role/SHAREBASEDPAYMENTPLANSTables SHARE-BASED PAYMENT PLANS (Tables) Tables http://www.telefonica.com.br/role/SHAREBASEDPAYMENTPLANS 96 false false R97.htm 9955559 - Disclosure - FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Tables) Sheet http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTTables FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Tables) Tables http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENT 97 false false R98.htm 9955560 - Disclosure - ADDITIONAL INFORMATION ON CASH FLOWS (Tables) Sheet http://www.telefonica.com.br/role/ADDITIONALINFORMATIONONCASHFLOWSTables ADDITIONAL INFORMATION ON CASH FLOWS (Tables) Tables http://www.telefonica.com.br/role/ADDITIONALINFORMATIONONCASHFLOWS 98 false false R99.htm 9955561 - Disclosure - CONTRACTUAL COMMITMENTS AND GUARANTEES (Tables) Sheet http://www.telefonica.com.br/role/CONTRACTUALCOMMITMENTSANDGUARANTEESTables CONTRACTUAL COMMITMENTS AND GUARANTEES (Tables) Tables http://www.telefonica.com.br/role/CONTRACTUALCOMMITMENTSANDGUARANTEES 99 false false R100.htm 9955562 - Disclosure - OTHER MATTERS (Details) Sheet http://www.telefonica.com.br/role/OTHERMATTERSDetails OTHER MATTERS (Details) Details http://www.telefonica.com.br/role/OTHERMATTERS 100 false false R101.htm 9955563 - Disclosure - OPERATIONS - (Detail 1) Sheet http://www.telefonica.com.br/role/OPERATIONSDetail1 OPERATIONS - (Detail 1) Details http://www.telefonica.com.br/role/OPERATIONS 101 false false R102.htm 9955564 - Disclosure - OPERATIONS - (Detail 2) Sheet http://www.telefonica.com.br/role/OPERATIONSDetail2 OPERATIONS - (Detail 2) Details http://www.telefonica.com.br/role/OPERATIONS 102 false false R103.htm 9955565 - Disclosure - OPERATIONS - (Detail 3) Sheet http://www.telefonica.com.br/role/OPERATIONSDetail3 OPERATIONS - (Detail 3) Details http://www.telefonica.com.br/role/OPERATIONS 103 false false R104.htm 9955566 - Disclosure - OPERATIONS - (Detail 4) Sheet http://www.telefonica.com.br/role/OPERATIONSDetail4 OPERATIONS - (Detail 4) Details http://www.telefonica.com.br/role/OPERATIONS 104 false false R105.htm 9955567 - Disclosure - OPERATIONS - Additional Information (Details) Sheet http://www.telefonica.com.br/role/OPERATIONSAdditionalInformationDetails OPERATIONS - Additional Information (Details) Details 105 false false R106.htm 9955568 - Disclosure - CASH AND CASH EQUIVALENTS (Details) Sheet http://www.telefonica.com.br/role/CASHANDCASHEQUIVALENTSDetails CASH AND CASH EQUIVALENTS (Details) Details http://www.telefonica.com.br/role/CASHANDCASHEQUIVALENTSTables 106 false false R107.htm 9955569 - Disclosure - Cash and Cash Equivalents - Additional Information (Details) Sheet http://www.telefonica.com.br/role/CashandCashEquivalentsAdditionalInformationDetails Cash and Cash Equivalents - Additional Information (Details) Details 107 false false R108.htm 9955570 - Disclosure - FINANCIAL INVESTMENTS (Details) Sheet http://www.telefonica.com.br/role/FINANCIALINVESTMENTSDetails FINANCIAL INVESTMENTS (Details) Details http://www.telefonica.com.br/role/FINANCIALINVESTMENTSTables 108 false false R109.htm 9955571 - Disclosure - TRADE ACCOUNTS RECEIVABLE (Detail 1) Sheet http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLEDetail1 TRADE ACCOUNTS RECEIVABLE (Detail 1) Details http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLETables 109 false false R110.htm 9955572 - Disclosure - TRADE ACCOUNTS RECEIVABLE (Detail 2) Sheet http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLEDetail2 TRADE ACCOUNTS RECEIVABLE (Detail 2) Details http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLETables 110 false false R111.htm 9955573 - Disclosure - TRADE ACCOUNTS RECEIVABLE (Detail 3) Sheet http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLEDetail3 TRADE ACCOUNTS RECEIVABLE (Detail 3) Details http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLETables 111 false false R112.htm 9955574 - Disclosure - TRADE ACCOUNTS RECEIVABLE - (Detail 4) Sheet http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLEDetail4 TRADE ACCOUNTS RECEIVABLE - (Detail 4) Details http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLETables 112 false false R113.htm 9955575 - Disclosure - TRADE ACCOUNTS RECEIVABLE - Additional information (Details) Sheet http://www.telefonica.com.br/role/TRADEACCOUNTSRECEIVABLEAdditionalinformationDetails TRADE ACCOUNTS RECEIVABLE - Additional information (Details) Details 113 false false R114.htm 9955576 - Disclosure - INVENTORIES (Details) Sheet http://www.telefonica.com.br/role/INVENTORIESDetails INVENTORIES (Details) Details http://www.telefonica.com.br/role/INVENTORIESTables 114 false false R115.htm 9955577 - Disclosure - PREPAID EXPENSES (Details) Sheet http://www.telefonica.com.br/role/PREPAIDEXPENSESDetails PREPAID EXPENSES (Details) Details http://www.telefonica.com.br/role/PREPAIDEXPENSESTables 115 false false R116.htm 9955578 - Disclosure - PREPAID EXPENSES (Details 2) Sheet http://www.telefonica.com.br/role/PREPAIDEXPENSESDetails2 PREPAID EXPENSES (Details 2) Details http://www.telefonica.com.br/role/PREPAIDEXPENSESTables 116 false false R117.htm 9955579 - Disclosure - INCOME AND SOCIAL CONTRIBUTION TAXES - Income and Social Contribution taxes recoverable (Details) Sheet http://www.telefonica.com.br/role/INCOMEANDSOCIALCONTRIBUTIONTAXESIncomeandSocialContributiontaxesrecoverableDetails INCOME AND SOCIAL CONTRIBUTION TAXES - Income and Social Contribution taxes recoverable (Details) Details 117 false false R118.htm 9955580 - Disclosure - INCOME AND SOCIAL CONTRIBUTION TAXES - Income and Social Contribution taxes payable (Details) Sheet http://www.telefonica.com.br/role/INCOMEANDSOCIALCONTRIBUTIONTAXESIncomeandSocialContributiontaxespayableDetails INCOME AND SOCIAL CONTRIBUTION TAXES - Income and Social Contribution taxes payable (Details) Details 118 false false R119.htm 9955581 - Disclosure - INCOME AND SOCIAL CONTRIBUTION TAXES - Deferred taxes (Details) Sheet http://www.telefonica.com.br/role/INCOMEANDSOCIALCONTRIBUTIONTAXESDeferredtaxesDetails INCOME AND SOCIAL CONTRIBUTION TAXES - Deferred taxes (Details) Details 119 false false R120.htm 9955582 - Disclosure - INCOME AND SOCIAL CONTRIBUTION TAXES - Projections (Details) Sheet http://www.telefonica.com.br/role/INCOMEANDSOCIALCONTRIBUTIONTAXESProjectionsDetails INCOME AND SOCIAL CONTRIBUTION TAXES - Projections (Details) Details 120 false false R121.htm 9955583 - Disclosure - INCOME AND SOCIAL CONTRIBUTION TAXES - Reconciliation of income tax and social contribution expense (Details) Sheet http://www.telefonica.com.br/role/INCOMEANDSOCIALCONTRIBUTIONTAXESReconciliationofincometaxandsocialcontributionexpenseDetails INCOME AND SOCIAL CONTRIBUTION TAXES - Reconciliation of income tax and social contribution expense (Details) Details 121 false false R122.htm 9955584 - Disclosure - INCOME AND SOCIAL CONTRIBUTION TAXES - Uncertainties about Income Tax Treatments (Details) Sheet http://www.telefonica.com.br/role/INCOMEANDSOCIALCONTRIBUTIONTAXESUncertaintiesaboutIncomeTaxTreatmentsDetails INCOME AND SOCIAL CONTRIBUTION TAXES - Uncertainties about Income Tax Treatments (Details) Details 122 false false R123.htm 9955585 - Disclosure - TAXES, CHARGES AND CONTRIBUTIONS RECOVERABLE (Details) Sheet http://www.telefonica.com.br/role/TAXESCHARGESANDCONTRIBUTIONSRECOVERABLEDetails TAXES, CHARGES AND CONTRIBUTIONS RECOVERABLE (Details) Details http://www.telefonica.com.br/role/TAXESCHARGESANDCONTRIBUTIONSRECOVERABLETables 123 false false R124.htm 9955587 - Disclosure - JUDICIAL DEPOSITS AND GARNISHMENTS - Judicial Deposits and garnishments (Details) Sheet http://www.telefonica.com.br/role/JUDICIALDEPOSITSANDGARNISHMENTSJudicialDepositsandgarnishmentsDetails JUDICIAL DEPOSITS AND GARNISHMENTS - Judicial Deposits and garnishments (Details) Details 124 false false R125.htm 9955588 - Disclosure - JUDICIAL DEPOSITS AND GARNISHMENTS - Tax related judicial Deposits (Details) Sheet http://www.telefonica.com.br/role/JUDICIALDEPOSITSANDGARNISHMENTSTaxrelatedjudicialDepositsDetails JUDICIAL DEPOSITS AND GARNISHMENTS - Tax related judicial Deposits (Details) Details 125 false false R126.htm 9955589 - Disclosure - OTHER ASSETS (Details) Sheet http://www.telefonica.com.br/role/OTHERASSETSDetails OTHER ASSETS (Details) Details http://www.telefonica.com.br/role/OTHERASSETSTables 126 false false R127.htm 9955591 - Disclosure - INVESTMENTS - Direct equity interests in subsidiaries and jointly controlled companies (Details) Sheet http://www.telefonica.com.br/role/INVESTMENTSDirectequityinterestsinsubsidiariesandjointlycontrolledcompaniesDetails INVESTMENTS - Direct equity interests in subsidiaries and jointly controlled companies (Details) Details 127 false false R128.htm 9955592 - Disclosure - INVESTMENTS - Disclosure of joint ventures (Details) Sheet http://www.telefonica.com.br/role/INVESTMENTSDisclosureofjointventuresDetails INVESTMENTS - Disclosure of joint ventures (Details) Details 128 false false R129.htm 9955593 - Disclosure - INVESTMENTS - Disclosure of changes in investments (Details) Sheet http://www.telefonica.com.br/role/INVESTMENTSDisclosureofchangesininvestmentsDetails INVESTMENTS - Disclosure of changes in investments (Details) Details 129 false false R130.htm 9955594 - Disclosure - Property, Plant And Equipment (Details 1) Sheet http://www.telefonica.com.br/role/PropertyPlantAndEquipmentDetails1 Property, Plant And Equipment (Details 1) Details 130 false false R131.htm 9955595 - Disclosure - Property, plant and equipment (Details 2) Sheet http://www.telefonica.com.br/role/PropertyplantandequipmentDetails2 Property, plant and equipment (Details 2) Details 131 false false R132.htm 9955596 - Disclosure - Property, plant and equipment (Details 3) Sheet http://www.telefonica.com.br/role/PropertyplantandequipmentDetails3 Property, plant and equipment (Details 3) Details 132 false false R133.htm 9955597 - Disclosure - Property, plant and equipment (Details 4) Sheet http://www.telefonica.com.br/role/PropertyplantandequipmentDetails4 Property, plant and equipment (Details 4) Details 133 false false R134.htm 9955598 - Disclosure - Property, plant and equipment - Additional Information (Details) Sheet http://www.telefonica.com.br/role/PropertyplantandequipmentAdditionalInformationDetails Property, plant and equipment - Additional Information (Details) Details 134 false false R135.htm 9955599 - Disclosure - Intangible Assets (Details 1) Sheet http://www.telefonica.com.br/role/IntangibleAssetsDetails1 Intangible Assets (Details 1) Details 135 false false R136.htm 9955600 - Disclosure - Intangible Assets (Details 2) Sheet http://www.telefonica.com.br/role/IntangibleAssetsDetails2 Intangible Assets (Details 2) Details 136 false false R137.htm 9955601 - Disclosure - IMPAIRMENT OF NON-FINANCIAL ASSETS - Additional Information (Details) Sheet http://www.telefonica.com.br/role/IMPAIRMENTOFNONFINANCIALASSETSAdditionalInformationDetails IMPAIRMENT OF NON-FINANCIAL ASSETS - Additional Information (Details) Details 137 false false R138.htm 9955602 - Disclosure - PERSONNEL, SOCIAL CHARGES AND BENEFITS (Details) Sheet http://www.telefonica.com.br/role/PERSONNELSOCIALCHARGESANDBENEFITSDetails PERSONNEL, SOCIAL CHARGES AND BENEFITS (Details) Details http://www.telefonica.com.br/role/PERSONNELSOCIALCHARGESANDBENEFITSTables 138 false false R139.htm 9955604 - Disclosure - TRADE ACCOUNTS PAYABLE (Details) Sheet http://www.telefonica.com.br/role/TRADEACCOUNTSPAYABLEDetails TRADE ACCOUNTS PAYABLE (Details) Details http://www.telefonica.com.br/role/TRADEACCOUNTSPAYABLETables 139 false false R140.htm 9955605 - Disclosure - TAXES, CHARGES AND CONTRIBUTIONS PAYABLE (Details) Sheet http://www.telefonica.com.br/role/TAXESCHARGESANDCONTRIBUTIONSPAYABLEDetails TAXES, CHARGES AND CONTRIBUTIONS PAYABLE (Details) Details http://www.telefonica.com.br/role/TAXESCHARGESANDCONTRIBUTIONSRECOVERABLETables 140 false false R141.htm 9955606 - Disclosure - DIVIDENDS AND INTEREST ON EQUITY - Breakdown (Details) Sheet http://www.telefonica.com.br/role/DIVIDENDSANDINTERESTONEQUITYBreakdownDetails DIVIDENDS AND INTEREST ON EQUITY - Breakdown (Details) Details 141 false false R142.htm 9955607 - Disclosure - DIVIDENDS AND INTEREST ON EQUITY - Changes (Details) Sheet http://www.telefonica.com.br/role/DIVIDENDSANDINTERESTONEQUITYChangesDetails DIVIDENDS AND INTEREST ON EQUITY - Changes (Details) Details 142 false false R143.htm 9955608 - Disclosure - PREPAID EXPENSE - Movement of incremental costs in obtaining contracts with customers (Details) Sheet http://www.telefonica.com.br/role/PREPAIDEXPENSEMovementofincrementalcostsinobtainingcontractswithcustomersDetails PREPAID EXPENSE - Movement of incremental costs in obtaining contracts with customers (Details) Details 143 false false R144.htm 9955609 - Disclosure - PROVISIONS AND CONTINGENCIES - Breakdown of changes in provisions (Details) Sheet http://www.telefonica.com.br/role/PROVISIONSANDCONTINGENCIESBreakdownofchangesinprovisionsDetails PROVISIONS AND CONTINGENCIES - Breakdown of changes in provisions (Details) Details 144 false false R145.htm 9955610 - Disclosure - PROVISIONS AND CONTINGENCIES - Tax Provision and Contingencies (Details) Sheet http://www.telefonica.com.br/role/PROVISIONSANDCONTINGENCIESTaxProvisionandContingenciesDetails PROVISIONS AND CONTINGENCIES - Tax Provision and Contingencies (Details) Details 145 false false R146.htm 9955611 - Disclosure - PROVISIONS AND CONTINGENCIES - Labor provisions and contingencies (Details) Sheet http://www.telefonica.com.br/role/PROVISIONSANDCONTINGENCIESLaborprovisionsandcontingenciesDetails PROVISIONS AND CONTINGENCIES - Labor provisions and contingencies (Details) Details 146 false false R147.htm 9955612 - Disclosure - LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Details 1) Sheet http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYDetails1 LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Details 1) Details http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYTables 147 false false R148.htm 9955613 - Disclosure - LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Details 2) Sheet http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYDetails2 LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Details 2) Details http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYTables 148 false false R149.htm 9955614 - Disclosure - LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Details 3) Sheet http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYDetails3 LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Details 3) Details http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYTables 149 false false R150.htm 9955615 - Disclosure - LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Details 4) Sheet http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYDetails4 LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Details 4) Details http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYTables 150 false false R151.htm 9955616 - Disclosure - LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Details 5) Sheet http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYDetails5 LOANS, FINANCING, DEBENTURES, LEASE, 5G LICENSES AND LIABILITIES FOR THE ACQUISITION OF A COMPANY (Details 5) Details http://www.telefonica.com.br/role/LOANSFINANCINGDEBENTURESLEASE5GLICENSESANDLIABILITIESFORTHEACQUISITIONOFACOMPANYTables 151 false false R152.htm 9955617 - Disclosure - DEFERRED INCOME - Schedule of deferred income (Details) Sheet http://www.telefonica.com.br/role/DEFERREDINCOMEScheduleofdeferredincomeDetails DEFERRED INCOME - Schedule of deferred income (Details) Details 152 false false R153.htm 9955618 - Disclosure - DEFERRED INCOME - Changes in contractual liabilities (Details) Sheet http://www.telefonica.com.br/role/DEFERREDINCOMEChangesincontractualliabilitiesDetails DEFERRED INCOME - Changes in contractual liabilities (Details) Details 153 false false R154.htm 9955619 - Disclosure - DEFERRED INCOME - Expected periods of realization of contractual liabilities (Details) Sheet http://www.telefonica.com.br/role/DEFERREDINCOMEExpectedperiodsofrealizationofcontractualliabilitiesDetails DEFERRED INCOME - Expected periods of realization of contractual liabilities (Details) Details 154 false false R155.htm 9955620 - Disclosure - OTHER LIABILITIES (Details) Sheet http://www.telefonica.com.br/role/OTHERLIABILITIESDetails OTHER LIABILITIES (Details) Details http://www.telefonica.com.br/role/OTHERLIABILITIESTables 155 false false R156.htm 9955622 - Disclosure - Equity - Additional Information (Details) Sheet http://www.telefonica.com.br/role/EquityAdditionalInformationDetails Equity - Additional Information (Details) Details 156 false false R157.htm 9955623 - Disclosure - Equtiy (Details 1) Sheet http://www.telefonica.com.br/role/EqutiyDetails1 Equtiy (Details 1) Details 157 false false R158.htm 9955624 - Disclosure - Equtiy (Details 2) Sheet http://www.telefonica.com.br/role/EqutiyDetails2 Equtiy (Details 2) Details 158 false false R159.htm 9955625 - Disclosure - Equtiy (Details 3) Sheet http://www.telefonica.com.br/role/EqutiyDetails3 Equtiy (Details 3) Details 159 false false R160.htm 9955626 - Disclosure - Equity (Details 4) Sheet http://www.telefonica.com.br/role/EquityDetails4 Equity (Details 4) Details 160 false false R161.htm 9955627 - Disclosure - Equity (Details 5) Sheet http://www.telefonica.com.br/role/EquityDetails5 Equity (Details 5) Details 161 false false R162.htm 9955628 - Disclosure - Equity (Details 6) Sheet http://www.telefonica.com.br/role/EquityDetails6 Equity (Details 6) Details 162 false false R163.htm 9955629 - Disclosure - Equity (Details 7) Sheet http://www.telefonica.com.br/role/EquityDetails7 Equity (Details 7) Details 163 false false R164.htm 9955630 - Disclosure - NET OPERATING REVENUE (Details) Sheet http://www.telefonica.com.br/role/NETOPERATINGREVENUEDetails NET OPERATING REVENUE (Details) Details http://www.telefonica.com.br/role/NETOPERATINGREVENUETables 164 false false R165.htm 9955631 - Disclosure - OPERATING COSTS AND EXPENSES (Details) Sheet http://www.telefonica.com.br/role/OPERATINGCOSTSANDEXPENSESDetails OPERATING COSTS AND EXPENSES (Details) Details http://www.telefonica.com.br/role/OPERATINGCOSTSANDEXPENSESTables 165 false false R166.htm 9955632 - Disclosure - OPERATING COSTS AND EXPENSES (Details 2) Sheet http://www.telefonica.com.br/role/OPERATINGCOSTSANDEXPENSESDetails2 OPERATING COSTS AND EXPENSES (Details 2) Details http://www.telefonica.com.br/role/OPERATINGCOSTSANDEXPENSESTables 166 false false R167.htm 9955633 - Disclosure - OTHER OPERATING INCOME, NET - Additional Information (Details) Sheet http://www.telefonica.com.br/role/OTHEROPERATINGINCOMENETAdditionalInformationDetails OTHER OPERATING INCOME, NET - Additional Information (Details) Details 167 false false R168.htm 9955634 - Disclosure - OTHER OPERATING INCOME, NET (Details) Sheet http://www.telefonica.com.br/role/OTHEROPERATINGINCOMENETDetails OTHER OPERATING INCOME, NET (Details) Details http://www.telefonica.com.br/role/OTHEROPERATINGINCOMENETTables 168 false false R169.htm 9955635 - Disclosure - FINANCIAL INCOME (EXPENSES) (Details) Sheet http://www.telefonica.com.br/role/FINANCIALINCOMEEXPENSESDetails FINANCIAL INCOME (EXPENSES) (Details) Details http://www.telefonica.com.br/role/FINANCIALINCOMEEXPENSESTables 169 false false R170.htm 9955636 - Disclosure - BALANCES AND TRANSACTIONS WITH RELATED PARTIES - Balance Sheet (Details 1) Sheet http://www.telefonica.com.br/role/BALANCESANDTRANSACTIONSWITHRELATEDPARTIESBalanceSheetDetails1 BALANCES AND TRANSACTIONS WITH RELATED PARTIES - Balance Sheet (Details 1) Details 170 false false R171.htm 9955637 - Disclosure - BALANCES AND TRANSACTIONS WITH RELATED PARTIES - Balance Sheet (Details 2) Sheet http://www.telefonica.com.br/role/BALANCESANDTRANSACTIONSWITHRELATEDPARTIESBalanceSheetDetails2 BALANCES AND TRANSACTIONS WITH RELATED PARTIES - Balance Sheet (Details 2) Details 171 false false R172.htm 9955638 - Disclosure - BALANCES AND TRANSACTIONS WITH RELATED PARTIES - Income Statement (Details 3) Sheet http://www.telefonica.com.br/role/BALANCESANDTRANSACTIONSWITHRELATEDPARTIESIncomeStatementDetails3 BALANCES AND TRANSACTIONS WITH RELATED PARTIES - Income Statement (Details 3) Details 172 false false R173.htm 9955639 - Disclosure - BALANCES AND TRANSACTIONS WITH RELATED PARTIES - Management compensation - Additional Information (Details) Sheet http://www.telefonica.com.br/role/BALANCESANDTRANSACTIONSWITHRELATEDPARTIESManagementcompensationAdditionalInformationDetails BALANCES AND TRANSACTIONS WITH RELATED PARTIES - Management compensation - Additional Information (Details) Details 173 false false R174.htm 9955640 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 1) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails1 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 1) Details 174 false false R175.htm 9955641 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 2) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails2 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 2) Details 175 false false R176.htm 9955642 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 3) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails3 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 3) Details 176 false false R177.htm 9955643 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 4) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails4 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 4) Details 177 false false R178.htm 9955644 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 5) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails5 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 5) Details 178 false false R179.htm 9955645 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 6) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails6 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 6) Details 179 false false R180.htm 9955646 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 7) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails7 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 7) Details 180 false false R181.htm 9955647 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 8) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails8 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 8) Details 181 false false R182.htm 9955648 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 9) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails9 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 9) Details 182 false false R183.htm 9955649 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 10) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails10 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 10) Details 183 false false R184.htm 9955650 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 11) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails11 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 11) Details 184 false false R185.htm 9955651 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 12) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails12 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 12) Details 185 false false R186.htm 9955652 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 13) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails13 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 13) Details 186 false false R187.htm 9955653 - Disclosure - PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 14) Sheet http://www.telefonica.com.br/role/PENSIONSPLANSANDOTHERPOSTEMPLOYMENTBENEFITSDetails14 PENSIONS PLANS AND OTHER POST-EMPLOYMENT BENEFITS (Details 14) Details 187 false false R188.htm 9955654 - Disclosure - PENSION PLANS AND OTHER POST-EMPLOYMENT BENEFITS - Additional Information (Details) Sheet http://www.telefonica.com.br/role/PENSIONPLANSANDOTHERPOSTEMPLOYMENTBENEFITSAdditionalInformationDetails PENSION PLANS AND OTHER POST-EMPLOYMENT BENEFITS - Additional Information (Details) Details 188 false false R189.htm 9955655 - Disclosure - SHARE-BASED PAYMENT PLANS (Details) Sheet http://www.telefonica.com.br/role/SHAREBASEDPAYMENTPLANSDetails SHARE-BASED PAYMENT PLANS (Details) Details http://www.telefonica.com.br/role/SHAREBASEDPAYMENTPLANSTables 189 false false R190.htm 9955656 - Disclosure - FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 1) Sheet http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTDetails1 FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 1) Details http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTTables 190 false false R191.htm 9955657 - Disclosure - FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 2) Sheet http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTDetails2 FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 2) Details http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTTables 191 false false R192.htm 9955658 - Disclosure - FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 3) Sheet http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTDetails3 FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 3) Details http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTTables 192 false false R193.htm 9955659 - Disclosure - FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 4) Sheet http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTDetails4 FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 4) Details http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTTables 193 false false R194.htm 9955660 - Disclosure - FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 5) Sheet http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTDetails5 FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 5) Details http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTTables 194 false false R195.htm 9955661 - Disclosure - FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 6) Sheet http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTDetails6 FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 6) Details http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTTables 195 false false R196.htm 9955662 - Disclosure - FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 7) Sheet http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTDetails7 FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT (Details 7) Details http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTTables 196 false false R197.htm 9955663 - Disclosure - FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT - Additional Information (Details) Sheet http://www.telefonica.com.br/role/FINANCIALINSTRUMENTSANDRISKANDCAPITALMANAGEMENTAdditionalInformationDetails FINANCIAL INSTRUMENTS AND RISK AND CAPITAL MANAGEMENT - Additional Information (Details) Details 197 false false R198.htm 9955664 - Disclosure - ADDITIONAL INFORMATION ON CASH FLOWS (Details) Sheet http://www.telefonica.com.br/role/ADDITIONALINFORMATIONONCASHFLOWSDetails ADDITIONAL INFORMATION ON CASH FLOWS (Details) Details http://www.telefonica.com.br/role/ADDITIONALINFORMATIONONCASHFLOWSTables 198 false false R199.htm 9955665 - Disclosure - CONTRACTUAL COMMITMENTS AND GUARANTEES - Contractual commitments (Details) Sheet http://www.telefonica.com.br/role/CONTRACTUALCOMMITMENTSANDGUARANTEESContractualcommitmentsDetails CONTRACTUAL COMMITMENTS AND GUARANTEES - Contractual commitments (Details) Details 199 false false R200.htm 9955666 - Disclosure - CONTRACTUAL COMMITMENTS AND GUARANTEES - Guarantees (Details) Sheet http://www.telefonica.com.br/role/CONTRACTUALCOMMITMENTSANDGUARANTEESGuaranteesDetails CONTRACTUAL COMMITMENTS AND GUARANTEES - Guarantees (Details) Details 200 false false R201.htm 9955667 - Disclosure - SUBSEQUENT EVENTS (Details) Sheet http://www.telefonica.com.br/role/SUBSEQUENTEVENTSDetails SUBSEQUENT EVENTS (Details) Details http://www.telefonica.com.br/role/SUBSEQUENTEVENTS 201 false false All Reports Book All Reports viv-20251231.htm viv-20251231.xsd viv-20251231_cal.xml viv-20251231_def.xml viv-20251231_lab.xml viv-20251231_pre.xml viv-20251231_g1.jpg http://fasb.org/srt/2025 http://xbrl.sec.gov/cyd/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full true true