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Note 25 Post employment commitments (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Net liability asset € 6,424,000,000 € 6,181,000,000  
Defined benefit obligation, at present value 5,683,000,000 6,424,000,000 € 6,181,000,000
SPAIN      
Disclosure of net defined benefit liability (asset) [line items]      
Net liability asset 2,310,000,000    
Defined benefit obligation, at present value 2,078,000,000 2,310,000,000  
Plan assets 129,000,000    
Plan assets 114,000,000 129,000,000  
Net liability asset 1,964,000,000 2,181,000,000 2,399,000,000
Net liability asset 2,181,000,000 2,399,000,000 3,464,000,000
SPAIN | Current service cost [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 4,000,000    
Plan assets changes of the year 0    
Net liability asset changes of the year 4,000,000 3,000,000 4,000,000
SPAIN | Interest income or expense [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 73,000,000    
Plan assets changes of the year 4,000,000    
Net liability asset changes of the year 69,000,000 85,000,000 51,000,000
SPAIN | Contributions by plan participants [Member]      
Disclosure of net defined benefit liability (asset) [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]      
Disclosure of net defined benefit liability (asset) [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 | Past service cost [Member]      
Disclosure of net defined benefit liability (asset) [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] 0 0
SPAIN | Remeasurements [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 24,000,000    
Plan assets changes of the year 1,000,000    
Net liability asset changes of the year 23,000,000 67,000,000 (643,000,000)
SPAIN | Return of plan assets [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value [2] 0    
Plan assets changes of the year [2] 1,000,000    
Net liability asset changes of the year (1,000,000) [2] 0 34,000,000
SPAIN | From changes in demographic assumptions [Member]      
Disclosure of net defined benefit liability (asset) [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 | From changes in financial assumptions [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 34,000,000    
Plan assets changes of the year 0    
Net liability asset changes of the year 34,000,000 78,000,000 (643,000,000)
SPAIN | Other actuarial gains and losses [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (10,000,000)    
Plan assets changes of the year 0    
Net liability asset changes of the year (10,000,000) (11,000,000) (34,000,000)
SPAIN | Benefit payments [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (341,000,000)    
Plan assets changes of the year (20,000,000)    
Net liability asset changes of the year (321,000,000) (379,000,000) (484,000,000)
SPAIN | Settlements payments [Member]      
Disclosure of net defined benefit liability (asset) [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 | Total for all business combinations [member]      
Disclosure of net defined benefit liability (asset) [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]      
Disclosure of net defined benefit liability (asset) [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]      
Disclosure of net defined benefit liability (asset) [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]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 8,000,000    
Plan assets changes of the year 0    
Net liability asset changes of the year 8,000,000 6,000,000 7,000,000
SPAIN | of which vested benefit obligation relating to current employees [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 72,000,000    
SPAIN | Of which vested benefit obligation relating to retired employees [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 2,006,000,000    
MEXICO      
Disclosure of net defined benefit liability (asset) [line items]      
Net liability asset 1,269,000,000    
Defined benefit obligation, at present value 1,124,000,000 1,269,000,000  
Plan assets 958,000,000    
Plan assets 748,000,000 958,000,000  
Net liability asset 377,000,000 311,000,000 132,000,000
Net liability asset 311,000,000 132,000,000 124,000,000
MEXICO | Current service cost [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 10,000,000    
Plan assets changes of the year 0    
Net liability asset changes of the year 10,000,000 9,000,000 7,000,000
MEXICO | Interest income or expense [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 118,000,000    
Plan assets changes of the year 87,000,000    
Net liability asset changes of the year 30,000,000 17,000,000 14,000,000
MEXICO | Contributions by plan participants [Member]      
Disclosure of net defined benefit liability (asset) [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]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 68,000,000    
Net liability asset changes of the year (68,000,000) (37,000,000) (41,000,000)
MEXICO | Past service cost [Member]      
Disclosure of net defined benefit liability (asset) [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] 0 1,000,000
MEXICO | Remeasurements [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 14,000,000    
Plan assets changes of the year (125,000,000)    
Net liability asset changes of the year 139,000,000 175,000,000 152,000,000
MEXICO | Return of plan assets [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value [2] 0    
Plan assets changes of the year [2] (125,000,000)    
Net liability asset changes of the year 125,000,000 [2] 19,000,000 45,000,000
MEXICO | From changes in demographic assumptions [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 2,000,000    
Plan assets changes of the year 0    
Net liability asset changes of the year 2,000,000 0 0
MEXICO | From changes in financial assumptions [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (10,000,000)    
Plan assets changes of the year 0    
Net liability asset changes of the year (10,000,000) 114,000,000 73,000,000
MEXICO | Other actuarial gains and losses [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 22,000,000    
Plan assets changes of the year 0    
Net liability asset changes of the year 22,000,000 42,000,000 34,000,000
MEXICO | Benefit payments [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (109,000,000)    
Plan assets changes of the year (108,000,000)    
Net liability asset changes of the year 0 0 0
MEXICO | Settlements payments [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (1,000,000)    
Plan assets changes of the year (1,000,000)    
Net liability asset changes of the year 0 0 0
MEXICO | Total for all business combinations [member]      
Disclosure of net defined benefit liability (asset) [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 (139,000,000)
MEXICO | Effect on changes in foreign exchange rates [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (177,000,000)    
Plan assets changes of the year (132,000,000)    
Net liability asset changes of the year (45,000,000) 15,000,000 13,000,000
MEXICO | Conversions to defined contributions [Member]      
Disclosure of net defined benefit liability (asset) [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]      
Disclosure of net defined benefit liability (asset) [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      
Disclosure of net defined benefit liability (asset) [line items]      
Net liability asset 435,000,000    
Defined benefit obligation, at present value 567,000,000 435,000,000  
Plan assets 363,000,000    
Plan assets 488,000,000 363,000,000  
Net liability asset 80,000,000 72,000,000 103,000,000
Net liability asset 72,000,000 103,000,000 63,000,000
TURKEY | Current service cost [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 18,000,000    
Plan assets changes of the year 0    
Net liability asset changes of the year 18,000,000 17,000,000 13,000,000
TURKEY | Interest income or expense [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 105,000,000    
Plan assets changes of the year 89,000,000    
Net liability asset changes of the year 16,000,000 8,000,000 10,000,000
TURKEY | Contributions by plan participants [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 14,000,000    
Plan assets changes of the year 14,000,000    
Net liability asset changes of the year 0 0 0
TURKEY | Employer contributions [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 39,000,000    
Net liability asset changes of the year (39,000,000) (23,000,000) (22,000,000)
TURKEY | Past service cost [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value [1] 3,000,000    
Plan assets changes of the year [1] 0    
Net liability asset changes of the year 3,000,000 [1] 33,000,000 2,000,000
TURKEY | Remeasurements [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 83,000,000    
Plan assets changes of the year 50,000,000    
Net liability asset changes of the year 32,000,000 32,000,000 62,000,000
TURKEY | Return of plan assets [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value [2] 0    
Plan assets changes of the year [2] 50,000,000    
Net liability asset changes of the year (50,000,000) [2] (129,000,000) (104,000,000)
TURKEY | From changes in demographic assumptions [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (15,000,000)    
Plan assets changes of the year 0    
Net liability asset changes of the year (15,000,000) (14,000,000) (37,000,000)
TURKEY | From changes in financial assumptions [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (97,000,000)    
Plan assets changes of the year 0    
Net liability asset changes of the year (97,000,000) 10,000,000 82,000,000
TURKEY | Other actuarial gains and losses [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 195,000,000    
Plan assets changes of the year 0    
Net liability asset changes of the year 195,000,000 165,000,000 122,000,000
TURKEY | Benefit payments [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (32,000,000)    
Plan assets changes of the year (20,000,000)    
Net liability asset changes of the year (11,000,000) (43,000,000) (6,000,000)
TURKEY | Settlements payments [Member]      
Disclosure of net defined benefit liability (asset) [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 | Total for all business combinations [member]      
Disclosure of net defined benefit liability (asset) [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]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (48,000,000)    
Plan assets changes of the year (40,000,000)    
Net liability asset changes of the year (8,000,000) (40,000,000) (18,000,000)
TURKEY | Conversions to defined contributions [Member]      
Disclosure of net defined benefit liability (asset) [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]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (11,000,000)    
Plan assets changes of the year (7,000,000)    
Net liability asset changes of the year (4,000,000) (14,000,000) 0
Rest of the world [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net liability asset 247,000,000    
Defined benefit obligation, at present value 260,000,000 247,000,000  
Plan assets 224,000,000    
Plan assets 234,000,000 224,000,000  
Net liability asset 26,000,000 23,000,000 25,000,000
Net liability asset 23,000,000 25,000,000 24,000,000
Rest of the world [Member] | Current service cost [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 3,000,000    
Plan assets changes of the year 0    
Net liability asset changes of the year 3,000,000 3,000,000 3,000,000
Rest of the world [Member] | Interest income or expense [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 9,000,000    
Plan assets changes of the year 7,000,000    
Net liability asset changes of the year 2,000,000 2,000,000 4,000,000
Rest of the world [Member] | Contributions by plan participants [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 2,000,000    
Plan assets changes of the year 2,000,000    
Net liability asset changes of the year 0 0 0
Rest of the world [Member] | Employer contributions [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 22,000,000    
Net liability asset changes of the year (22,000,000) (29,000,000) (3,000,000)
Rest of the world [Member] | Past service cost [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value [1] 4,000,000    
Plan assets changes of the year [1] 0    
Net liability asset changes of the year 4,000,000 [1] 3,000,000 3,000,000
Rest of the world [Member] | Remeasurements [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 9,000,000    
Plan assets changes of the year (10,000,000)    
Net liability asset changes of the year 19,000,000 21,000,000 (1,000,000)
Rest of the world [Member] | Return of plan assets [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value [2] 0    
Plan assets changes of the year [2] (10,000,000)    
Net liability asset changes of the year 10,000,000 [2] 25,000,000 121,000,000
Rest of the world [Member] | From changes in demographic assumptions [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 (2,000,000) 8,000,000
Rest of the world [Member] | From changes in financial assumptions [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 3,000,000    
Plan assets changes of the year 0    
Net liability asset changes of the year 3,000,000 (10,000,000) (132,000,000)
Rest of the world [Member] | Other actuarial gains and losses [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 6,000,000    
Plan assets changes of the year 0    
Net liability asset changes of the year 6,000,000 8,000,000 2,000,000
Rest of the world [Member] | Benefit payments [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (12,000,000)    
Plan assets changes of the year (11,000,000)    
Net liability asset changes of the year (1,000,000) (1,000,000) (1,000,000)
Rest of the world [Member] | Settlements payments [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 (1,000,000) 0
Rest of the world [Member] | Total for all business combinations [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value 0    
Plan assets changes of the year 0    
Net liability asset changes of the year 0 (1,000,000) 0
Rest of the world [Member] | Effect on changes in foreign exchange rates [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at present value (2,000,000)    
Plan assets changes of the year 0    
Net liability asset changes of the year (2,000,000) 1,000,000 (3,000,000)
Rest of the world [Member] | Conversions to defined contributions [Member]      
Disclosure of net defined benefit liability (asset) [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]      
Disclosure of net defined benefit liability (asset) [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]
(2) Excluding interest, which is recorded under "Interest income or expense".