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Note 25 - Post-employment and other employee benefit commitments. Defined Benefit Commitments (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit At The Beginning [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan € 8,116,000,000 € 7,585,000,000 € 8,384,000,000
Defined Benefit At The Beginning [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 3,493,000,000 2,839,000,000 3,006,000,000
Defined Benefit At The Beginning [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 4,622,000,000 4,746,000,000 5,378,000,000
Current Service Cost Net Defined Benefit Liability Asset [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 53,000,000 52,000,000 61,000,000
Current Service Cost Net Defined Benefit Liability Asset [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 0
Current Service Cost Net Defined Benefit Liability Asset [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 53,000,000 52,000,000 61,000,000
Interest Expense Income Net Defined Benefit Liability Asset [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 261,000,000 290,000,000 279,000,000
Interest Expense Income Net Defined Benefit Liability Asset [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 219,000,000 230,000,000 206,000,000
Interest Expense Income Net Defined Benefit Liability Asset [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 42,000,000 60,000,000 74,000,000
Contributions To Plan Net Defined Benefit Liability Asset [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 4,000,000 4,000,000 4,000,000
Contributions To Plan Net Defined Benefit Liability Asset [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 4,000,000 4,000,000 3,000,000
Contributions To Plan Net Defined Benefit Liability Asset [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 1,000,000
Contributions To Plan By Employer Net Defined Benefit Liability Asset [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 0
Contributions To Plan By Employer Net Defined Benefit Liability Asset [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 124,000,000 65,000,000 103,000,000
Contributions To Plan By Employer Net Defined Benefit Liability Asset [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan (124,000,000) (65,000,000) (103,000,000)
Past Service Cost Net Defined Benefit Liability Asset [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan [1] 219,000,000 210,000,000 109,000,000
Past Service Cost Net Defined Benefit Liability Asset [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan [1] 0 0 0
Past Service Cost Net Defined Benefit Liability Asset [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan [1] 219,000,000 210,000,000 109,000,000
Gain Loss On Remeasurement Of Net Defined Benefit Liability Asset [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 364,000,000 783,000,000 (263,000,000)
Gain Loss On Remeasurement Of Net Defined Benefit Liability Asset [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 176,000,000 454,000,000 (286,000,000)
Gain Loss On Remeasurement Of Net Defined Benefit Liability Asset [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 187,000,000 329,000,000 21,000,000
Return On Plan Assets Net Defined Benefit Liability Asset [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan [2] 0 0 0
Return On Plan Assets Net Defined Benefit Liability Asset [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan [2] 176,000,000 454,000,000 (286,000,000)
Return On Plan Assets Net Defined Benefit Liability Asset [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan [2] (176,000,000) (454,000,000) 286,000,000
Actuarial Gains Losses Arising From Changes In Demographic Assumptions Net Defined Benefit Liability Asset [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 57,000,000 (15,000,000) 14,000,000
Actuarial Gains Losses Arising From Changes In Demographic Assumptions Net Defined Benefit Liability Asset [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 0
Actuarial Gains Losses Arising From Changes In Demographic Assumptions Net Defined Benefit Liability Asset [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 57,000,000 (15,000,000) 14,000,000
Actuarial Gains Losses Arising From Changes In Financial Assumptions Net Defined Benefit Liability Asset [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 276,000,000 688,000,000 (274,000,000)
Actuarial Gains Losses Arising From Changes In Financial Assumptions Net Defined Benefit Liability Asset [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 0
Actuarial Gains Losses Arising From Changes In Financial Assumptions Net Defined Benefit Liability Asset [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 276,000,000 688,000,000 (274,000,000)
Actuarial Gains Losses Arising From Experience Adjustments Net Defined Benefit Liability Asset [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 30,000,000 110,000,000 (3,000,000)
Actuarial Gains Losses Arising From Experience Adjustments Net Defined Benefit Liability Asset [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 0
Actuarial Gains Losses Arising From Experience Adjustments Net Defined Benefit Liability Asset [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 30,000,000 110,000,000 (3,000,000)
Benefit payments defined Benefit Commitments | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan (839,000,000) (905,000,000) (979,000,000)
Benefit payments defined Benefit Commitments | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan (185,000,000) (187,000,000) (200,000,000)
Benefit payments defined Benefit Commitments | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan (654,000,000) (718,000,000) (779,000,000)
Settlement payments defined Benefit Commitments | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 0
Settlement payments defined Benefit Commitments | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 0
Settlement payments defined Benefit Commitments | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 0
Business combinations and disposalsdefined Benefit Commitments | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan [3] (371,000,000) 15,000,000 13,000,000
Business combinations and disposalsdefined Benefit Commitments | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan [3] (327,000,000) 12,000,000 11,000,000
Business combinations and disposalsdefined Benefit Commitments | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan [3] (44,000,000) 3,000,000 2,000,000
Effect on changes in foreign exchange rates defined Benefit Commitments | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan (459,000,000) 63,000,000 (31,000,000)
Effect on changes in foreign exchange rates defined Benefit Commitments | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan (409,000,000) 69,000,000 (9,000,000)
Effect on changes in foreign exchange rates defined Benefit Commitments | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan (50,000,000) (6,000,000) (22,000,000)
Defined Benefit Transformation | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 0
Defined Benefit Transformation | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 0
Defined Benefit Transformation | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 0 0
Other effects defined Benefit Commitments | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 1,000,000 19,000,000 10,000,000
Other effects defined Benefit Commitments | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan (3,000,000) 6,000,000 6,000,000
Other effects defined Benefit Commitments | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 4,000,000 13,000,000 4,000,000
Defined benefit at the end Member [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 7,348,000,000 8,116,000,000 7,585,000,000
Defined benefit at the end Member [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 3,092,000,000 3,493,000,000 2,840,000,000
Defined benefit at the end Member [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 4,256,000,000 4,623,000,000 4,745,000,000
Of Which Spain [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 4,288,000,000 4,592,000,000 4,807,000,000
Of Which Spain [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 249,000,000 266,000,000 260,000,000
Of Which Spain [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 4,039,000,000 4,326,000,000 4,547,000,000
Of Which Mexico [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 2,219,000,000 2,231,000,000 1,615,000,000
Of Which Mexico [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 2,122,000,000 2,124,000,000 1,587,000,000
Of Which Mexico [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 97,000,000 107,000,000 28,000,000
Of Which United States [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 375,000,000 326,000,000
Of Which United States [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 323,000,000 287,000,000
Of Which United States [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 0 52,000,000 39,000,000
Of Which Turkey [Member] | Present Value Of Defined Benefit Obligation Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 367,000,000 444,000,000 422,000,000
Of Which Turkey [Member] | Plan Assets Member      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan 282,000,000 359,000,000 339,000,000
Of Which Turkey [Member] | Net Benefit Liability Asset [Member]      
Disclosure of defined benefit commitments Line Items      
Defined Benefit Commitments Plan € 85,000,000 € 86,000,000 € 83,000,000
[1]

(1) Including gains and losses arising from settlements.

[2]

(2) Excluding interest, which is recorded under "Interest income or expense".

[3]

(*) The amount in 2020 in mainly due to the stake in BBV A USA (see Note 3).