v3.25.4
Note 25 Defined benefits (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period € 5,299 € 5,989 € 5,715
Current service cost, defined benefit plans 44 51 52
Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) 475 472 425
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan 15 16 10
Contributions to plan by employer, net defined benefit liability (asset) 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from past service cost [1] 6 7 36
Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income 726 (202) 375
Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense [2] 0 0 0
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions 21 2 (86)
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions 520 (362) 248
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments 185 158 212
Decrease (increase) in net defined benefit liability (asset) resulting from payments from plan 546 564 655
Decrease (increase) in net defined benefit liability (asset) resulting from payments in respect of settlements 0 (1) (76)
Increase (decrease) in net defined benefit liability (asset) resulting from business combinations and disposals 0 0 (1)
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) (100) (467) 124
Conversions to defined contributions 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from other changes (4) (3) (15)
Net assets available for benefits at end of period 5,915 5,299 5,989
Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 2,951 3,419 3,084
Current service cost, defined benefit plans 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) 369 356 311
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan 15 16 10
Contributions to plan by employer, net defined benefit liability (asset) (330) (143) (106)
Increase (decrease) in net defined benefit liability (asset) resulting from past service cost [1] 0 0 0
Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income 352 (330) 68
Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense [2] 352 (330) 68
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions 0 0 0
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions 0 0 0
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments 0 0 0
Decrease (increase) in net defined benefit liability (asset) resulting from payments from plan 275 230 232
Decrease (increase) in net defined benefit liability (asset) resulting from payments in respect of settlements 0 (1) (75)
Increase (decrease) in net defined benefit liability (asset) resulting from business combinations and disposals 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) (83) (416) 153
Conversions to defined contributions 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from other changes (7) (7) (7)
Net assets available for benefits at end of period 3,650 2,951 3,419
Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 2,348 2,571 2,632
Current service cost, defined benefit plans 44 51 52
Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) 105 115 114
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan 0 0 0
Contributions to plan by employer, net defined benefit liability (asset) (330) (143) (106)
Increase (decrease) in net defined benefit liability (asset) resulting from past service cost [1] 6 7 36
Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income 373 128 307
Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense [2] (352) 330 (68)
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions 21 2 (86)
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions 520 (362) 248
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments 185 158 212
Decrease (increase) in net defined benefit liability (asset) resulting from payments from plan (271) (334) (424)
Decrease (increase) in net defined benefit liability (asset) resulting from payments in respect of settlements 0 0 (1)
Increase (decrease) in net defined benefit liability (asset) resulting from business combinations and disposals 0 0 (1)
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) (17) (51) (29)
Conversions to defined contributions 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from other changes 4 4 (8)
Net assets available for benefits at end of period 2,265 2,348 2,571
SPAIN | Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 2,078 2,310  
Net assets available for benefits at end of period 1,770 2,078 2,310
SPAIN | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 114 129  
Net assets available for benefits at end of period 96 114 129
SPAIN | Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 1,964 2,181  
Net assets available for benefits at end of period 1,674 1,964 2,181
MEXICO | Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 2,385 2,988  
Net assets available for benefits at end of period 3,218 2,385 2,988
MEXICO | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 2,114 2,702  
Net assets available for benefits at end of period 2,733 2,114 2,702
MEXICO | Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 271 286  
Net assets available for benefits at end of period 485 271 286
TURKEY | Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 567 435  
Net assets available for benefits at end of period 675 567 435
TURKEY | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 488 363  
Net assets available for benefits at end of period 599 488 363
TURKEY | Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 80 72  
Net assets available for benefits at end of period € 77 € 80 € 72
[1] (1) Including gains and losses arising from settlements
[2]
(2) Excluding interest, which is recorded under "Interest income or expense".