v3.25.4
Property, plant and equipment - Additional Information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment R$ 47,357,040 R$ 46,812,381 R$ 46,318,147
Additions [1] 10,108,587 11,075,032  
Revaluation increase (decrease), property, plant and equipment [2] (239,653) (141,532)  
Net transfers [3] (1,298) (35,058)  
Subletting (4,873) (65,290)  
Depreciation, property, plant and equipment (10,994,217) (10,339,983)  
Write Offs, Net Related To Cancellation Of Lease Agreements 213,077 (74,258)  
Decrease in depreciation expense 864,182 432,091  
Property, plant and equipment, pledged as security 9,675 29,414  
Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 13,116,047 13,247,618 12,080,117
Additions 3,700,137 4,774,379  
Subletting (4,873) (65,290)  
Gross carrying amount      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 195,098,914 185,180,626  
Gross carrying amount | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 32,845,934 30,069,796  
Accumulated depreciation and amortisation      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment (147,741,874) (138,368,245)  
Accumulated depreciation and amortisation | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment (19,729,887) (16,822,178)  
Liabilities for the acquisition of a company - Vita IT      
PROPERTY, PLANT AND EQUIPMENT      
Acquisitions through business combinations, property, plant and equipment   1,065  
Switching and transmission equipment      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 21,709,525 22,770,806 23,266,868
Additions [1] 140,156 162,171  
Revaluation increase (decrease), property, plant and equipment [2] (2,810) (10,653)  
Net transfers [3] 3,235,811 3,266,774  
Depreciation, property, plant and equipment (4,437,238) (3,914,354)  
Switching and transmission equipment | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 290,486 253,131 203,519
Additions R$ 128,257 R$ 139,125  
Switching and transmission equipment | Minimum | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 10.00% 10.00%  
Switching and transmission equipment | Maximum | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 66.67% 66.67%  
Switching and transmission equipment | Gross carrying amount      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment R$ 94,868,938 R$ 91,758,158  
Switching and transmission equipment | Gross carrying amount | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 638,473 520,634  
Switching and transmission equipment | Accumulated depreciation and amortisation      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment (73,159,413) (68,987,352)  
Switching and transmission equipment | Accumulated depreciation and amortisation | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment (347,987) (267,503)  
Infrastructure      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 17,402,210 15,990,041 14,929,179
Additions [1] 3,636,211 4,707,950  
Revaluation increase (decrease), property, plant and equipment [2] (217,861) (111,421)  
Net transfers [3] 547,154 358,091  
Subletting (4,873) (65,290)  
Depreciation, property, plant and equipment (4,105,108) (3,829,001)  
Infrastructure | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 12,775,310 12,989,228 11,862,992
Additions 3,508,375 4,634,552  
Subletting R$ (4,873) R$ (65,290)  
Infrastructure | Minimum      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 2.50% 2.50%  
Infrastructure | Minimum | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 2.36% 2.36%  
Infrastructure | Maximum      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 50.00% 50.00%  
Infrastructure | Maximum | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 92.31% 92.31%  
Infrastructure | Gross carrying amount      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment R$ 52,291,576 R$ 47,318,029  
Infrastructure | Gross carrying amount | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 32,014,344 29,418,847  
Infrastructure | Accumulated depreciation and amortisation      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment (34,889,366) (31,327,988)  
Infrastructure | Accumulated depreciation and amortisation | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment (19,239,034) (16,429,619)  
Infrastructure | Liabilities for the acquisition of a company - Vita IT      
PROPERTY, PLANT AND EQUIPMENT      
Acquisitions through business combinations, property, plant and equipment   533  
Lending equipment      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 5,356,093 5,510,213 5,401,694
Additions [1] 90,341 85,285  
Revaluation increase (decrease), property, plant and equipment [2] (17) (469)  
Net transfers [3] 1,961,984 2,185,708  
Depreciation, property, plant and equipment R$ (2,206,428) R$ (2,162,005)  
Lending equipment | Minimum      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 20.00% 20.00%  
Lending equipment | Maximum      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 50.00% 50.00%  
Lending equipment | Gross carrying amount      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment R$ 32,937,369 R$ 31,701,975  
Lending equipment | Accumulated depreciation and amortisation      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment (27,581,276) (26,191,762)  
Terminal equipment      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 117,604 212,486 421,385
Additions [1] 590 32  
Revaluation increase (decrease), property, plant and equipment [2]   (536)  
Net transfers [3] 17,612 36,752  
Depreciation, property, plant and equipment R$ (113,084) R$ (245,147)  
Terminal equipment | Minimum      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 10.00% 10.00%  
Terminal equipment | Maximum      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 50.00% 50.00%  
Terminal equipment | Gross carrying amount      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment R$ 6,585,887 R$ 6,582,403  
Terminal equipment | Accumulated depreciation and amortisation      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment (6,468,283) (6,369,917)  
Land      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 238,078 239,265 249,536
Revaluation increase (decrease), property, plant and equipment [2] (643) (10,271)  
Land | Gross carrying amount      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 238,078 239,265  
Land | Accumulated depreciation and amortisation      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 0 0  
Other property, plant and equipment      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 434,919 453,959 512,930
Additions [1] 171,553 117,026  
Revaluation increase (decrease), property, plant and equipment [2] (6,750)    
Net transfers [3] (53,752) 12,947  
Depreciation, property, plant and equipment (132,359) (189,476)  
Other property, plant and equipment | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 50,251 5,259 13,606
Additions R$ 63,505 R$ 702  
Other property, plant and equipment | Minimum | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 26.09% 26.09%  
Other property, plant and equipment | Maximum | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 37.50% 40.00%  
Other property, plant and equipment | Gross carrying amount      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment R$ 6,078,455 R$ 5,945,185  
Other property, plant and equipment | Gross carrying amount | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 193,117 130,315  
Other property, plant and equipment | Accumulated depreciation and amortisation      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment (5,643,536) (5,491,226)  
Other property, plant and equipment | Accumulated depreciation and amortisation | Changes in leases, after the adoption of IFRS 16      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment (142,866) (125,056)  
Other property, plant and equipment | Liabilities for the acquisition of a company - Vita IT      
PROPERTY, PLANT AND EQUIPMENT      
Acquisitions through business combinations, property, plant and equipment   532  
Construction in progress      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 2,098,611 1,635,611 R$ 1,536,555
Additions [1] 6,069,736 6,002,568  
Revaluation increase (decrease), property, plant and equipment [2] (11,572) (8,182)  
Net transfers [3] (5,710,107) (5,895,330)  
Construction in progress | Gross carrying amount      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment 2,098,611 1,635,611  
Construction in progress | Accumulated depreciation and amortisation      
PROPERTY, PLANT AND EQUIPMENT      
Property, plant and equipment R$ 0 R$ 0  
Switching and transmission equipment and media | Minimum      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 2.50% 2.50%  
Switching and transmission equipment and media | Maximum      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 66.67% 66.67%  
Other P&E assets | Minimum      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 10.00% 10.00%  
Other P&E assets | Maximum      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation rate, property, plant and equipment 50.00% 50.00%  
[1] Additions from property and equipment mainly refers to: (i) in 2025 Investments were primarily directed towards expanding the 5G mobile network and strengthening FTTH to support the growth of connected customers. These investments demonstrate the Company's commitment to the quality of services provided, ensuring robust and consistent commercial performance throughout the year, in both B2C and B2B; .(ii) in 2024: Investments were primarily directed towards accelerating the 5G mobile network, as well as strengthening transmission backhaul, backbone and network, and FTTH customers. These were some of the initiatives that boosted our commercial growth this year, reinforcing our commitment to the quality of our services and ensuring healthy and consistent growth.
[2] In infrastructure, includes the amounts of R$213,077 and R$74,258 in 2025 and 2024, respectively, referring to the cancellation of lease agreements.
[3] Total balances refer to transfers between classes of fixed and intangible assets (Note 14.c.).