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Note 25 - Post-employment and other employee benefit commitments. Defined Medical Commitments (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Present Value Of Defined Benefit Obligation Member | Defined Medical benefit at the beginning Member [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit € 1,580,000,000 € 1,114,000,000 € 1,204,000,000
Present Value Of Defined Benefit Obligation Member | Current Service Cost Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 21,000,000 21,000,000 27,000,000
Present Value Of Defined Benefit Obligation Member | Interest Expense Income Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 117,000,000 119,000,000 116,000,000
Present Value Of Defined Benefit Obligation Member | Contributions To Plan Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Present Value Of Defined Benefit Obligation Member | Contributions To Plan By Employer Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Present Value Of Defined Benefit Obligation Member | Past Service Cost Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit [1] (8,000,000) 0 (42,000,000)
Present Value Of Defined Benefit Obligation Member | Gain Loss On Remeasurement Of Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 95,000,000 298,000,000 (210,000,000)
Present Value Of Defined Benefit Obligation Member | Return On Plan Assets Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit [2] 0 0 0
Present Value Of Defined Benefit Obligation Member | Actuarial Gains Losses Arising From Changes In Demographic Assumptions Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Present Value Of Defined Benefit Obligation Member | Actuarial Gains Losses Arising From Changes In Financial Assumptions Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 110,000,000 311,000,000 (182,000,000)
Present Value Of Defined Benefit Obligation Member | Actuarial Gains Losses Arising From Experience Adjustments Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit (15,000,000) (13,000,000) (28,000,000)
Present Value Of Defined Benefit Obligation Member | Benefit payments defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit (37,000,000) (39,000,000) (34,000,000)
Present Value Of Defined Benefit Obligation Member | Settlement payments defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Present Value Of Defined Benefit Obligation Member | Business combinations and disposalsdefined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Present Value Of Defined Benefit Obligation Member | Effect on changes in foreign exchange rates defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit (207,000,000) 68,000,000 62,000,000
Present Value Of Defined Benefit Obligation Member | Other effects defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 (1,000,000) (9,000,000)
Present Value Of Defined Benefit Obligation Member | Defined benefit at the end Member [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 1,562,000,000 1,580,000,000 1,114,000,000
Plan Assets Member | Defined Medical benefit at the beginning Member [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 1,532,000,000 1,146,000,000 1,114,000,000
Plan Assets Member | Current Service Cost Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Plan Assets Member | Interest Expense Income Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 120,000,000 123,000,000 109,000,000
Plan Assets Member | Contributions To Plan Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Plan Assets Member | Contributions To Plan By Employer Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 22,000,000 0 71,000,000
Plan Assets Member | Past Service Cost Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit [1] 0 0 0
Plan Assets Member | Gain Loss On Remeasurement Of Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 66,000,000 224,000,000 (164,000,000)
Plan Assets Member | Return On Plan Assets Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit [2] 66,000,000 224,000,000 (164,000,000)
Plan Assets Member | Actuarial Gains Losses Arising From Changes In Demographic Assumptions Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Plan Assets Member | Actuarial Gains Losses Arising From Changes In Financial Assumptions Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Plan Assets Member | Actuarial Gains Losses Arising From Experience Adjustments Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Plan Assets Member | Benefit payments defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit (37,000,000) (39,000,000) (33,000,000)
Plan Assets Member | Settlement payments defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Plan Assets Member | Business combinations and disposalsdefined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit (19,000,000) 7,000,000 0
Plan Assets Member | Effect on changes in foreign exchange rates defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit (201,000,000) 71,000,000 59,000,000
Plan Assets Member | Other effects defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 (9,000,000)
Plan Assets Member | Defined benefit at the end Member [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 1,484,000,000 1,532,000,000 1,146,000,000
Net Benefit Liability Asset [Member] | Defined Medical benefit at the beginning Member [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 48,000,000 (32,000,000) 91,000,000
Net Benefit Liability Asset [Member] | Current Service Cost Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 21,000,000 21,000,000 27,000,000
Net Benefit Liability Asset [Member] | Interest Expense Income Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit (3,000,000) (4,000,000) 8,000,000
Net Benefit Liability Asset [Member] | Contributions To Plan Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Net Benefit Liability Asset [Member] | Contributions To Plan By Employer Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit (22,000,000) 0 (71,000,000)
Net Benefit Liability Asset [Member] | Past Service Cost Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit [1] (8,000,000) 0 (42,000,000)
Net Benefit Liability Asset [Member] | Gain Loss On Remeasurement Of Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 30,000,000 74,000,000 (47,000,000)
Net Benefit Liability Asset [Member] | Return On Plan Assets Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit [2] (66,000,000) (224,000,000) 164,000,000
Net Benefit Liability Asset [Member] | Actuarial Gains Losses Arising From Changes In Demographic Assumptions Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Net Benefit Liability Asset [Member] | Actuarial Gains Losses Arising From Changes In Financial Assumptions Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 110,000,000 311,000,000 (182,000,000)
Net Benefit Liability Asset [Member] | Actuarial Gains Losses Arising From Experience Adjustments Net Defined Benefit Liability Asset [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit (15,000,000) (13,000,000) (28,000,000)
Net Benefit Liability Asset [Member] | Benefit payments defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 (1,000,000) (1,000,000)
Net Benefit Liability Asset [Member] | Settlement payments defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 0 0
Net Benefit Liability Asset [Member] | Business combinations and disposalsdefined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 19,000,000 (7,000,000) 0
Net Benefit Liability Asset [Member] | Effect on changes in foreign exchange rates defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit (6,000,000) (2,000,000) 3,000,000
Net Benefit Liability Asset [Member] | Other effects defined Benefit Commitments      
Disclosure of medical commitments Line Items      
Defined Medical Benefit 0 (1,000,000) 0
Net Benefit Liability Asset [Member] | Defined benefit at the end Member [Member]      
Disclosure of medical commitments Line Items      
Defined Medical Benefit € 77,000,000 € 48,000,000 € (32,000,000)
[1]

(1) Including gains and losses arising from settlements.

[2]

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