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Note 25 Post employment commitments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Post employment commitments [Line Items]      
Defined benefit obligation, at present value € 7,180 € 7,398  
Defined benefit obligation, at present value 6,181 7,180 € 7,398
SPAIN      
Post employment commitments [Line Items]      
Defined benefit obligation, at present value 3,670    
Defined benefit obligation, at present value 2,546 3,670  
Plan assets 206    
Plan assets 147 206  
Net liability asset 3,464 4,039 4,326
Net liability asset 2,399 3,464 4,039
SPAIN | Current service cost [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 4    
Plan assets changes of the year 0    
Net liability asset changes of the year 4 5 5
SPAIN | Interest income or expense [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 53    
Plan assets changes of the year 2    
Net liability asset changes of the year 51 20 28
SPAIN | Contributions by plan participants [Member]      
Post employment commitments [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 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 11 0
SPAIN | Past service cost [Member]      
Post employment commitments [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] 75 [2] 224 [2]
SPAIN | Remeasurements [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value (677)    
Plan assets changes of the year (34)    
Net liability asset changes of the year (643) (98) 95
SPAIN | Return of plan assets [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value [3] 0    
Plan assets changes of the year [3] (34)    
Net liability asset changes of the year 34 [3] 8 [4] (41) [4]
SPAIN | From changes in demographic assumptions [Member]      
Post employment commitments [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 60
SPAIN | From changes in financial assumptions [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value (643)    
Plan assets changes of the year 0    
Net liability asset changes of the year (643) (61) 79
SPAIN | Other actuarial gains and losses [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value (34)    
Plan assets changes of the year 0    
Net liability asset changes of the year (34) (45) (3)
SPAIN | Benefit payments [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value (511)    
Plan assets changes of the year (27)    
Net liability asset changes of the year (484) (599) (643)
SPAIN | Settlements payments [Member]      
Post employment commitments [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 [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 [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 [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 [Line Items]      
Defined benefit obligation at present value 7    
Plan assets changes of the year 0    
Net liability asset changes of the year 7 12 3
SPAIN | of which vested benefit obligation relating to current employees [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation, at present value 2,491    
SPAIN | Of which vested benefit obligation relating to retired employees [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation, at present value 55    
MEXICO      
Post employment commitments [Line Items]      
Defined benefit obligation, at present value 779    
Defined benefit obligation, at present value 985 779  
Plan assets 655    
Plan assets 853 655  
Net liability asset 124 28 72
Net liability asset 132 124 28
MEXICO | Current service cost [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 7    
Plan assets changes of the year 0    
Net liability asset changes of the year 7 5 5
MEXICO | Interest income or expense [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 84    
Plan assets changes of the year 69    
Net liability asset changes of the year 14 1 6
MEXICO | Contributions by plan participants [Member]      
Post employment commitments [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 [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 41    
Net liability asset changes of the year (41) (2) (86)
MEXICO | Past service cost [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value [1] 1    
Plan assets changes of the year [1] 0    
Net liability asset changes of the year 1 [1] 0 [2] (1) [2]
MEXICO | Remeasurements [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 107    
Plan assets changes of the year (45)    
Net liability asset changes of the year 152 128 62
MEXICO | Return of plan assets [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value [3] 0    
Plan assets changes of the year [3] (45)    
Net liability asset changes of the year 45 [3] 49 [4] (31) [4]
MEXICO | From changes in demographic assumptions [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 (4) 0
MEXICO | From changes in financial assumptions [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 73    
Plan assets changes of the year 0    
Net liability asset changes of the year 73 84 (19)
MEXICO | Other actuarial gains and losses [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 34    
Plan assets changes of the year 0    
Net liability asset changes of the year 34 (2) 112
MEXICO | Benefit payments [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value (77)    
Plan assets changes of the year (77)    
Net liability asset changes of the year 0 (1) (1)
MEXICO | Settlements payments [Member]      
Post employment commitments [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
MEXICO | Business combinations [member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 139    
Net liability asset changes of the year (139) (40) (19)
MEXICO | Effect on changes in foreign exchange rates [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 85    
Plan assets changes of the year 72    
Net liability asset changes of the year 13 5 (10)
MEXICO | Conversions to defined contributions [Member]      
Post employment commitments [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 [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
UNITED STATES      
Post employment commitments [Line Items]      
Net liability asset   0 52
Net liability asset     0
UNITED STATES | Current service cost [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     1
UNITED STATES | Interest income or expense [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     2
UNITED STATES | Contributions by plan participants [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     0
UNITED STATES | Employer contributions [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     0
UNITED STATES | Past service cost [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year [2]     0
UNITED STATES | Remeasurements [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     (4)
UNITED STATES | Return of plan assets [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year [4]     (35)
UNITED STATES | From changes in demographic assumptions [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     (3)
UNITED STATES | From changes in financial assumptions [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     34
UNITED STATES | Other actuarial gains and losses [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     0
UNITED STATES | Benefit payments [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     (2)
UNITED STATES | Settlements payments [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     0
UNITED STATES | Business combinations [member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     (44)
UNITED STATES | Effect on changes in foreign exchange rates [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     (5)
UNITED STATES | Conversions to defined contributions [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     0
UNITED STATES | Other effects Post employment commitments [Member]      
Post employment commitments [Line Items]      
Net liability asset changes of the year     0
TURKEY      
Post employment commitments [Line Items]      
Defined benefit obligation, at present value 272    
Defined benefit obligation, at present value 418 272  
Plan assets 209    
Plan assets 315 209  
Net liability asset 63 85 86
Net liability asset 103 63 85
TURKEY | Current service cost [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 13    
Plan assets changes of the year 0    
Net liability asset changes of the year 13 16 18
TURKEY | Interest income or expense [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 42    
Plan assets changes of the year 33    
Net liability asset changes of the year 10 9 8
TURKEY | Contributions by plan participants [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 8    
Plan assets changes of the year 8    
Net liability asset changes of the year 0 0 0
TURKEY | Employer contributions [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 22    
Net liability asset changes of the year (22) (11) (14)
TURKEY | Past service cost [Member]      
Post employment commitments [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] 2 [2]
TURKEY | Remeasurements [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 166    
Plan assets changes of the year 104    
Net liability asset changes of the year 62 10 18
TURKEY | Return of plan assets [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value [3] 0    
Plan assets changes of the year [3] 104    
Net liability asset changes of the year (104) [3] (11) [4] 23 [4]
TURKEY | From changes in demographic assumptions [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value (37)    
Plan assets changes of the year 0    
Net liability asset changes of the year (37) 0 0
TURKEY | From changes in financial assumptions [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 82    
Plan assets changes of the year 0    
Net liability asset changes of the year 82 (18) 54
TURKEY | Other actuarial gains and losses [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 122    
Plan assets changes of the year 0    
Net liability asset changes of the year 122 39 (59)
TURKEY | Benefit payments [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value (15)    
Plan assets changes of the year (9)    
Net liability asset changes of the year (6) (6) (6)
TURKEY | Settlements payments [Member]      
Post employment commitments [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 [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 [Line Items]      
Defined benefit obligation at present value (70)    
Plan assets changes of the year (52)    
Net liability asset changes of the year (18) (43) (26)
TURKEY | Conversions to defined contributions [Member]      
Post employment commitments [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 [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]      
Post employment commitments [Line Items]      
Defined benefit obligation, at present value 449    
Defined benefit obligation, at present value 318 449  
Plan assets 424    
Plan assets 293 424  
Net liability asset 24 27 38
Net liability asset 25 24 27
Rest of the world [Member] | Current service cost [Member]      
Post employment commitments [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 [Line Items]      
Defined benefit obligation at present value 10    
Plan assets changes of the year 6    
Net liability asset changes of the year 4 1 1
Rest of the world [Member] | Contributions by plan participants [Member]      
Post employment commitments [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] | Employer contributions [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 3    
Net liability asset changes of the year (3) (1) (1)
Rest of the world [Member] | Past service cost [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value [1] 3    
Plan assets changes of the year [1] 0    
Net liability asset changes of the year 3 [1] 2 [2] 3 [2]
Rest of the world [Member] | Remeasurements [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value (122)    
Plan assets changes of the year (121)    
Net liability asset changes of the year (1) (5) (14)
Rest of the world [Member] | Return of plan assets [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value [3] 0    
Plan assets changes of the year [3] (121)    
Net liability asset changes of the year 121 [3] 19 [4] (26) [4]
Rest of the world [Member] | From changes in demographic assumptions [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 8    
Plan assets changes of the year 0    
Net liability asset changes of the year 8 (2) 0
Rest of the world [Member] | From changes in financial assumptions [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value (132)    
Plan assets changes of the year 0    
Net liability asset changes of the year (132) (7) 17
Rest of the world [Member] | Other actuarial gains and losses [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 2    
Plan assets changes of the year 0    
Net liability asset changes of the year 2 (15) (5)
Rest of the world [Member] | Benefit payments [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value (13)    
Plan assets changes of the year (12)    
Net liability asset changes of the year (1) (1) (1)
Rest of the world [Member] | Settlements payments [Member]      
Post employment commitments [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
Rest of the world [Member] | Business combinations [member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 (2) 0
Rest of the world [Member] | Effect on changes in foreign exchange rates [Member]      
Post employment commitments [Line Items]      
Defined benefit obligation at present value (9)    
Plan assets changes of the year (6)    
Net liability asset changes of the year (3) 1 (4)
Rest of the world [Member] | Conversions to defined contributions [Member]      
Post employment commitments [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 [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
[1] (1) Including gains and losses arising from settlements.
[2] (1) Includes gains and losses from settlements.
[3] (2) Excluding interest, which is recorded under "Interest income or expense".
[4] (2) Excludes interest which is reflected in the line item “Interest income and expense”.