v3.26.1
Tax matters - Schedule of changes in deferred tax assets and liabilities (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets at beginning of period € 19,170 € 20,767 € 20,787
(Charge)/Credit to income 1,107 119 629
Foreign currency balance translation differences and other items (102) (1,670) (130)
(Charge)/Credit to asset and liability valuation adjustments (132) (41) (422)
Reclassification no-current asset held for sale (1,130)    
Acquisition for the year (net) 31 (5) (97)
Deferred tax assets at end of period 18,944 19,170 20,767
Deferred tax liabilities at beginning of period (6,276) (6,086) (6,428)
(Charge)/Credit to income (572) (547) 663
Foreign currency balance translation differences and other items 108 142 3
(Charge)/Credit to asset and liability valuation adjustments (232) 215 (338)
Reclassification no-current asset held for sale 1,064    
Acquisition for the year (net) 0 0 14
Deferred tax liabilities at end of period (5,904) (6,276) (6,086)
Deferred tax liability (asset) at beginning of period 12,894 14,681 14,359
(Charge)/Credit to income 535 (428) 1,292
Foreign currency balance translation differences and other items 6 (1,528) (127)
(Charge)/Credit to asset and liability valuation adjustments (364) 174 (760)
Reclassification no-current asset held for sale (66)    
Acquisition for the year (net) 31 (5) (83)
Deferred tax liability (asset) at end of period 13,040 12,894 14,681
Monetizable      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets at beginning of period 10,309 11,099  
Deferred tax assets at end of period 10,725 10,309 11,099
Tax losses and tax credits      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets at beginning of period 2,367 2,393 1,778
(Charge)/Credit to income 82 114 392
Foreign currency balance translation differences and other items (107) (139) 224
(Charge)/Credit to asset and liability valuation adjustments 0 0 0
Reclassification no-current asset held for sale 0    
Acquisition for the year (net) 12 (1) (1)
Deferred tax assets at end of period 2,354 2,367 2,393
Temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets at beginning of period 16,803 18,374 19,009
(Charge)/Credit to income 1,025 5 237
Foreign currency balance translation differences and other items 5 (1,531) (354)
(Charge)/Credit to asset and liability valuation adjustments (132) (41) (422)
Reclassification no-current asset held for sale (1,130)    
Acquisition for the year (net) 19 (4) (96)
Deferred tax assets at end of period 16,590 16,803 18,374
Deferred tax liabilities at beginning of period (6,276) (6,086) (6,428)
(Charge)/Credit to income (572) (547) 663
Foreign currency balance translation differences and other items 108 142 3
(Charge)/Credit to asset and liability valuation adjustments (232) 215 (338)
Reclassification no-current asset held for sale 1,064    
Acquisition for the year (net) 4 0 14
Deferred tax liabilities at end of period (5,904) (6,276) (6,086)
Temporary differences | Monetizable      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets at beginning of period 10,309 11,099 10,660
(Charge)/Credit to income 455 147 1,232
Foreign currency balance translation differences and other items (39) (937) (787)
(Charge)/Credit to asset and liability valuation adjustments 0 0 0
Reclassification no-current asset held for sale    
Acquisition for the year (net) 0 0 (6)
Deferred tax assets at end of period € 10,725 € 10,309 € 11,099