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Note 25 Defined benefits (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 € 7,348 € 8,116 € 7,585
Current service cost, defined benefit plans 53 53 52
Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) 253 261 290
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan 5 4 4
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] 75 219 210
Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income (406) 364 783
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 (121) 57 (15)
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions (259) 276 688
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments (27) 30 110
Decrease (increase) in net defined benefit liability (asset) resulting from payments from plan 765 839 905
Decrease (increase) in net defined benefit liability (asset) resulting from payments in respect of settlements (1) 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from business combinations and disposals [3] (2) (371) 15
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) (24) (459) 63
Conversions to defined contributions 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from other changes 13 1 19
Net assets available for benefits at end of period 6,547 7,348 8,116
Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 3,092 3,493 2,839
Current service cost, defined benefit plans 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) 220 219 230
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan 5 4 4
Contributions to plan by employer, net defined benefit liability (asset) (4) (124) (65)
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 (184) 176 454
Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense [2] (184) 176 454
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 158 185 187
Decrease (increase) in net defined benefit liability (asset) resulting from payments in respect of settlements (1) 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from business combinations and disposals [3] 1 (327) 12
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) 8 (409) 69
Conversions to defined contributions 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from other changes 0 (3) 6
Net assets available for benefits at end of period 2,988 3,092 3,493
Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 4,256 4,622 4,746
Current service cost, defined benefit plans 53 53 52
Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) 33 42 60
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) (4) (124) (65)
Increase (decrease) in net defined benefit liability (asset) resulting from past service cost [1] 75 219 210
Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income (223) 187 329
Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense [2] 184 (176) (454)
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions (121) 57 (15)
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions (259) 276 688
Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments (27) 30 110
Decrease (increase) in net defined benefit liability (asset) resulting from payments from plan (608) (654) (718)
Decrease (increase) in net defined benefit liability (asset) resulting from payments in respect of settlements 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from business combinations and disposals [3] (3) (44) 3
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) (32) (50) (6)
Conversions to defined contributions 0 0 0
Increase (decrease) in net defined benefit liability (asset) resulting from other changes 13 4 13
Net assets available for benefits at end of period 3,560 4,256 4,622
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 4,288 4,592  
Net assets available for benefits at end of period 3,670 4,288 4,592
SPAIN | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 249 266  
Net assets available for benefits at end of period 206 249 266
SPAIN | Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 4,039 4,326  
Net assets available for benefits at end of period 3,464 4,039 4,326
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 2,219 2,231  
Net assets available for benefits at end of period 2,150 2,219 2,231
MEXICO | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 2,122 2,124  
Net assets available for benefits at end of period 2,149 2,122 2,124
MEXICO | Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 97 107  
Net assets available for benefits at end of period 1 97 107
UNITED STATES | 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 0 375  
Net assets available for benefits at end of period 0 0 375
UNITED STATES | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 0 323  
Net assets available for benefits at end of period 0 0 323
UNITED STATES | Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 0 52  
Net assets available for benefits at end of period 0 0 52
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 367 444  
Net assets available for benefits at end of period 272 367 444
TURKEY | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 282 359  
Net assets available for benefits at end of period 209 282 359
TURKEY | Net liability asset [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net assets available for benefits at beginning of period 85 86  
Net assets available for benefits at end of period € 63 € 85 € 86
[1] (*) Including gains and losses arising from settlements.
[2] (**) Excluding interest, which is recorded under "Interest income or expense".
[3] (***) The amount in 2020 in mainly due to the companies in the United States included in the USA Sale (see Notes 1.3, 3 and 21).