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Note 25 Post employment commitments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value € 7,398 € 8,177  
Defined benefit obligation, at present value 7,180 7,398 € 8,177
SPAIN      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value 4,287    
Defined benefit obligation, at present value 3,670 4,287  
Plan assets 249    
Plan assets 206 249  
Net liability asset 4,038 4,326 4,547
Net liability asset 3,464 4,038 4,326
SPAIN | Current service cost [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 5    
Plan assets changes of the year 0    
Net liability asset changes of the year 5 5 4
SPAIN | Interest income or expense [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 22    
Plan assets changes of the year 2    
Net liability asset changes of the year 20 28 42
SPAIN | Contributions by plan participants [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
SPAIN | Employer contributions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year (11)    
Net liability asset changes of the year 11 0 0
SPAIN | Past service cost [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value [1] 75    
Plan assets changes of the year [1] 0    
Net liability asset changes of the year 75 [1] 224 [2] 190 [2]
SPAIN | Remeasurements [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (106)    
Plan assets changes of the year (8)    
Net liability asset changes of the year (98) 95 231
SPAIN | Return of plan assets [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value [3] 0    
Plan assets changes of the year [3] (8)    
Net liability asset changes of the year 8 [3] (41) [4] (67) [4]
SPAIN | From changes in demographic assumptions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 60 0
SPAIN | From changes in financial assumptions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (61)    
Plan assets changes of the year 0    
Net liability asset changes of the year (61) 79 239
SPAIN | Other actuarial gains and losses [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (45)    
Plan assets changes of the year 0    
Net liability asset changes of the year (45) (3) 59
SPAIN | Benefit payments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (625)    
Plan assets changes of the year (26)    
Net liability asset changes of the year (599) (643) (702)
SPAIN | Settlements payments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
SPAIN | Business combinations [member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
SPAIN | Effect on changes in foreign exchange rates [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
SPAIN | Conversions to defined contributions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
SPAIN | Other effects Post employment commitments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 12    
Plan assets changes of the year 0    
Net liability asset changes of the year 12 3 14
SPAIN | of which vested benefit obligation relating to current employees [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value 3,596    
SPAIN | Of which vested benefit obligation relating to retired employees [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value 74    
MEXICO      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value 666    
Defined benefit obligation, at present value 779 666  
Plan assets 638    
Plan assets 655 638  
Net liability asset 28 72 71
Net liability asset 124 28 72
MEXICO | Current service cost [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 5    
Plan assets changes of the year 0    
Net liability asset changes of the year 5 5 4
MEXICO | Interest income or expense [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 53    
Plan assets changes of the year 52    
Net liability asset changes of the year 1 6 9
MEXICO | Contributions by plan participants [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
MEXICO | Employer contributions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 2    
Net liability asset changes of the year (2) (86) (47)
MEXICO | Past service cost [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value [1] 0    
Plan assets changes of the year [1] 0    
Net liability asset changes of the year 0 [1] (1) [2] 15 [2]
MEXICO | Remeasurements [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 79    
Plan assets changes of the year (49)    
Net liability asset changes of the year 128 62 9
MEXICO | Return of plan assets [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value [3] 0    
Plan assets changes of the year [3] (49)    
Net liability asset changes of the year 49 [3] (31) [4] (90) [4]
MEXICO | From changes in demographic assumptions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (4)    
Plan assets changes of the year 0    
Net liability asset changes of the year (4) 0 0
MEXICO | From changes in financial assumptions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 84    
Plan assets changes of the year 0    
Net liability asset changes of the year 84 (19) 87
MEXICO | Other actuarial gains and losses [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (2)    
Plan assets changes of the year 0    
Net liability asset changes of the year (2) 112 12
MEXICO | Benefit payments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (67)    
Plan assets changes of the year (65)    
Net liability asset changes of the year (1) (1) (1)
MEXICO | Settlements payments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
MEXICO | Business combinations [member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 40    
Net liability asset changes of the year (40) (19) 7
MEXICO | Effect on changes in foreign exchange rates [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 42    
Plan assets changes of the year 37    
Net liability asset changes of the year 5 (10) 5
MEXICO | Conversions to defined contributions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
MEXICO | Other effects Post employment commitments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
MEXICO | of which vested benefit obligation relating to current employees [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value    
MEXICO | Of which vested benefit obligation relating to retired employees [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value    
UNITED STATES      
Post employment commitments 2021 [Line Items]      
Net liability asset 0 52 39
Net liability asset   0 52
UNITED STATES | Current service cost [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   1 0
UNITED STATES | Interest income or expense [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   2 0
UNITED STATES | Contributions by plan participants [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   0 0
UNITED STATES | Employer contributions [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   0 (3)
UNITED STATES | Past service cost [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year [2]   0 0
UNITED STATES | Remeasurements [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   (4) 16
UNITED STATES | Return of plan assets [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year [4]   (35) (28)
UNITED STATES | From changes in demographic assumptions [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   (3) 0
UNITED STATES | From changes in financial assumptions [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   34 42
UNITED STATES | Other actuarial gains and losses [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   0 2
UNITED STATES | Benefit payments [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   (2) (2)
UNITED STATES | Settlements payments [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   0 0
UNITED STATES | Business combinations [member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   (44) 3
UNITED STATES | Effect on changes in foreign exchange rates [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   (5) 0
UNITED STATES | Conversions to defined contributions [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   0 0
UNITED STATES | Other effects Post employment commitments [Member]      
Post employment commitments 2021 [Line Items]      
Net liability asset changes of the year   0 (1)
TURKEY      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value 367    
Defined benefit obligation, at present value 272 367  
Plan assets 282    
Plan assets 209 282  
Net liability asset 85 86 83
Net liability asset 63 85 86
TURKEY | Current service cost [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 16    
Plan assets changes of the year 0    
Net liability asset changes of the year 16 18 20
TURKEY | Interest income or expense [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 40    
Plan assets changes of the year 32    
Net liability asset changes of the year 9 8 11
TURKEY | Contributions by plan participants [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 3    
Plan assets changes of the year 3    
Net liability asset changes of the year 0 0 0
TURKEY | Employer contributions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 11    
Net liability asset changes of the year (11) (14) (14)
TURKEY | Past service cost [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value [1] 2    
Plan assets changes of the year [1] 0    
Net liability asset changes of the year 2 [1] 2 [2] 3 [2]
TURKEY | Remeasurements [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 21    
Plan assets changes of the year 11    
Net liability asset changes of the year 10 18 2
TURKEY | Return of plan assets [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value [3] 0    
Plan assets changes of the year [3] 11    
Net liability asset changes of the year (11) [3] 23 [4] 5 [4]
TURKEY | From changes in demographic assumptions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 (13)
TURKEY | From changes in financial assumptions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (18)    
Plan assets changes of the year 0    
Net liability asset changes of the year (18) 54 (41)
TURKEY | Other actuarial gains and losses [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 39    
Plan assets changes of the year 0    
Net liability asset changes of the year 39 (59) 51
TURKEY | Benefit payments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (13)    
Plan assets changes of the year (7)    
Net liability asset changes of the year (6) (6) (11)
TURKEY | Settlements payments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
TURKEY | Business combinations [member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
TURKEY | Effect on changes in foreign exchange rates [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (166)    
Plan assets changes of the year (123)    
Net liability asset changes of the year (43) (26) (9)
TURKEY | Conversions to defined contributions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
TURKEY | Other effects Post employment commitments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
TURKEY | of which vested benefit obligation relating to current employees [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value    
TURKEY | Of which vested benefit obligation relating to retired employees [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value    
Rest of the world [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value 465    
Defined benefit obligation, at present value 449 465  
Plan assets 439    
Plan assets 424 439  
Net liability asset 27 38 36
Net liability asset 24 27 38
Rest of the world [Member] | Current service cost [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 3    
Plan assets changes of the year 0    
Net liability asset changes of the year 3 3 3
Rest of the world [Member] | Interest income or expense [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 6    
Plan assets changes of the year 5    
Net liability asset changes of the year 1 1 3
Rest of the world [Member] | Contributions by plan participants [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 2    
Plan assets changes of the year 2    
Net liability asset changes of the year 0 0 0
Rest of the world [Member] | Employer contributions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 1    
Net liability asset changes of the year (1) (1) (1)
Rest of the world [Member] | Past service cost [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value [1] 2    
Plan assets changes of the year [1] 0    
Net liability asset changes of the year 2 [1] 3 [2] 2 [2]
Rest of the world [Member] | Remeasurements [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (24)    
Plan assets changes of the year (19)    
Net liability asset changes of the year (5) (14) (1)
Rest of the world [Member] | Return of plan assets [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value [3] 0    
Plan assets changes of the year [3] (19)    
Net liability asset changes of the year 19 [3] (26) [4] (50) [4]
Rest of the world [Member] | From changes in demographic assumptions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (2)    
Plan assets changes of the year 0    
Net liability asset changes of the year (2) 0 (2)
Rest of the world [Member] | From changes in financial assumptions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (7)    
Plan assets changes of the year 0    
Net liability asset changes of the year (7) 17 52
Rest of the world [Member] | Other actuarial gains and losses [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (15)    
Plan assets changes of the year 0    
Net liability asset changes of the year (15) (5) (1)
Rest of the world [Member] | Benefit payments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (12)    
Plan assets changes of the year (11)    
Net liability asset changes of the year (1) (1) (3)
Rest of the world [Member] | Settlements payments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (1)    
Plan assets changes of the year (1)    
Net liability asset changes of the year 0 0 0
Rest of the world [Member] | Business combinations [member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value (2)    
Plan assets changes of the year 0    
Net liability asset changes of the year (2) 0 0
Rest of the world [Member] | Effect on changes in foreign exchange rates [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 9    
Plan assets changes of the year 9    
Net liability asset changes of the year 1 (4) 1
Rest of the world [Member] | Conversions to defined contributions [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 0 0
Rest of the world [Member] | Other effects Post employment commitments [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 € 0 € 0
Rest of the world [Member] | of which vested benefit obligation relating to current employees [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value    
Rest of the world [Member] | Of which vested benefit obligation relating to retired employees [Member]      
Post employment commitments 2021 [Line Items]      
Defined benefit obligation, at present value    
[1] (*) Including gains and losses arising from settlements.
[2] (*) Includes gains and losses from settlements.
[3] (**) Excluding interest, which is recorded under "Interest income or expense".
[4] (**) Excludes interest which is reflected in the line item “Interest income and expense”.