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Note 19 Tax assets and liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Tax assets and liabilities [Line Items]      
Current tax assets € 932 € 1,199 € 1,765
Deferred tax assets 14,917 15,327 15,318
Tax assets 15,850 16,526 17,083
Current tax liabilities 644 545 880
Deferred tax liabilities 1,769 1,809 1,928
Tax liabilities 2,413 2,355 2,808
Pensions [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets 416 439 456
Financial instruments [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets 1,408 1,292 1,386
Deferred tax liabilities 1,124 908 1,014
Loss allowances [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets 1,676 1,683 1,636
Other [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets 1,101 1,069 1,045
Deferred tax liabilities 645 901 914
Secured tax assets [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets 9,304 9,361 9,363
Tax losses [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets € 1,012 € 1,483 € 1,432