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Note 25 Defined benefits (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
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 € 5,989 € 5,715 € 6,547
Current service cost, defined benefit plans 51 52 45
Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) 472 425 333
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan 16 10 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] 7 36 34
Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income (202) 375 (741)
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 2 (86) (29)
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions (362) 248 (812)
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments 158 212 100
Decrease (increase) in net defined benefit liability (asset) resulting from payments from plan 564 655 676
Decrease (increase) in net defined benefit liability (asset) resulting from payments in respect of settlements (1) (76) (4)
Increase (decrease) in net defined benefit liability (asset) resulting from business combinations and disposals 0 (1) 0
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) (467) 124 161
Conversions to defined contributions 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from other changes (3) (15) 7
Net assets available for benefits at end of period 5,299 5,989 5,715
Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 3,419 3,084 2,988
Current service cost, defined benefit plans 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) 356 311 267
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan 16 10 10
Contributions to plan by employer, net defined benefit liability (asset) (143) (106) (67)
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 (330) 68 (240)
Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense [2] (330) 68 (240)
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 230 232 184
Decrease (increase) in net defined benefit liability (asset) resulting from payments in respect of settlements (1) (75) (4)
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) (416) 153 180
Conversions to defined contributions 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from other changes (7) (7) 0
Net assets available for benefits at end of period 2,951 3,419 3,084
Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 2,571 2,632 3,560
Current service cost, defined benefit plans 51 52 45
Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) 115 114 65
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) (143) (106) (67)
Increase (decrease) in net defined benefit liability (asset) resulting from past service cost [1] 7 36 34
Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income 128 307 (501)
Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense [2] 330 (68) 240
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions 2 (86) (29)
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions (362) 248 (812)
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments 158 212 100
Decrease (increase) in net defined benefit liability (asset) resulting from payments from plan (334) (424) (492)
Decrease (increase) in net defined benefit liability (asset) resulting from payments in respect of settlements 0 (1) 0
Increase (decrease) in net defined benefit liability (asset) resulting from business combinations and disposals 0 (1) 0
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) (51) (29) (20)
Conversions to defined contributions 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from other changes 4 (8) 7
Net assets available for benefits at end of period 2,348 2,571 2,632
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 2,310 2,546  
Net assets available for benefits at end of period 2,078 2,310 2,546
SPAIN | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 129 147  
Net assets available for benefits at end of period 114 129 147
SPAIN | Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 2,181 2,399  
Net assets available for benefits at end of period 1,964 2,181 2,399
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 2,988 2,426  
Net assets available for benefits at end of period 2,385 2,988 2,426
MEXICO | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 2,702 2,329  
Net assets available for benefits at end of period 2,114 2,702 2,329
MEXICO | Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 286 97  
Net assets available for benefits at end of period 271 286 97
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 435 418  
Net assets available for benefits at end of period 567 435 418
TURKEY | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 363 315  
Net assets available for benefits at end of period 488 363 315
TURKEY | Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 72 103  
Net assets available for benefits at end of period € 80 € 72 € 103
[1]
(1) Including gains and losses arising from settlements.
[2]
(2) Excluding interest, which is recorded under "Interest income or expense".