v3.25.4
Condensed financial information of the parent company - Statement of changes in equity (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items]      
Balance start of period € 53,698 € 55,628 € 57,004
Net results 8,599 5,592 4,374
Other comprehensive income 30 1,357 985
Total comprehensive income 8,628 6,948 5,360
Dividends and other cash distributions (3,886) (4,377) (2,671)
Share buyback programmes, commitment (3,100) (4,500) (4,000)
Share buyback programmes, cancellation of shares 0 0 0
Employee share-based compensation plans 52 45 34
Other changes in treasury shares 6 2 (7)
Transfers 0 0 0
Other changes 5 (5) (50)
Balance end of period 55,339 53,698 55,628
Other reserves      
Condensed Financial Statements, Captions [Line Items]      
Balance start of period (687) (2,767) (2,192)
Net results 14 125 336
Other comprehensive income (151) 1,311 776
Total comprehensive income (137) 1,436 1,112
Share buyback programmes, cancellation of shares 2,000 5,000 2,701
Employee share-based compensation plans 60 43 41
Other changes in treasury shares 6 2 (7)
Transfers (616) (585) (899)
Balance end of period (3,080) (687) (2,767)
Unappropriated results      
Condensed Financial Statements, Captions [Line Items]      
Balance start of period 36,243 40,299 41,538
Net results 8,310 5,209 3,804
Total comprehensive income 8,310 5,209 3,804
Dividends and other cash distributions (3,691) (4,124) (2,668)
Share buyback programmes, commitment (3,100) (4,500) (4,000)
Share buyback programmes, cancellation of shares (1,999) (4,996) (2,699)
Employee share-based compensation plans (8) 1 (7)
Transfers 616 585 899
Balance end of period 40,016 36,243 40,299
Parent company      
Condensed Financial Statements, Captions [Line Items]      
Balance start of period 52,703 54,684 56,500
Net results 8,324 5,334 4,140
Other comprehensive income (151) 1,311 776
Total comprehensive income 8,173 6,645 4,916
Dividends and other cash distributions (3,691) (4,124) (2,668)
Share buyback programmes, commitment (3,100)    
Share buyback programmes, cancellation of shares
Employee share-based compensation plans (12) 2 (7)
Other changes in treasury shares 6 2 (7)
Transfers
Balance end of period 54,083 52,703 54,684
Parent company | Share capital      
Condensed Financial Statements, Captions [Line Items]      
Balance start of period 31 35 37
Share buyback programmes, cancellation of shares (1) (4) (2)
Balance end of period 30 31 35
Parent company | Share premium      
Condensed Financial Statements, Captions [Line Items]      
Balance start of period 17,116 17,116 17,116
Balance end of period 17,116 17,116 17,116
Parent company | Legal and statutory reserves      
Condensed Financial Statements, Captions [Line Items]      
Balance start of period 78 (773) (986)
Net results 14 125 336
Other comprehensive income (151) 1,311 776
Total comprehensive income (137) 1,436 1,112
Transfers (616) (585) (899)
Balance end of period (675) 78 (773)
Parent company | Other reserves      
Condensed Financial Statements, Captions [Line Items]      
Balance start of period 31,397 35,761 29,002
Total comprehensive income    
Dividends and other cash distributions (500) (498)
Share buyback programmes, commitment (3,100) (4,500) (4,000)
Share buyback programmes, cancellation of shares 1 4 2
Employee share-based compensation plans (12) 2 (7)
Other changes in treasury shares 6 2 (7)
Transfers 2,544 631 10,823
Other changes 5 (5) (50)
Balance end of period 30,341 31,397 35,761
Parent company | Unappropriated results      
Condensed Financial Statements, Captions [Line Items]      
Balance start of period 4,080 2,544 11,331
Net results 8,310 5,209 3,804
Other comprehensive income    
Total comprehensive income 8,310 5,209 3,804
Dividends and other cash distributions (3,191) (3,626) (2,668)
Transfers (1,928) (47) (9,923)
Balance end of period € 7,271 € 4,080 € 2,544