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Hedging derivatives - Reconciliation of components of equity (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about hedged items [line items]      
Balance at beginning of year € 295 € 300 € 277
Earnings (losses) recognized in other comprehensive income (941) (64) 8
Amounts transferred to income statements 801 (851) 1,112
Taxes 278 5 (17)
Balance at end of year (276) 295 300
Cash flow hedges      
Disclosure of detailed information about hedged items [line items]      
Earnings (losses) recognized in other comprehensive income (941) (67) 8
Amounts transferred to income statements 801 (851) 1,112
Cash flow hedges | Interest rate including other risks      
Disclosure of detailed information about hedged items [line items]      
Earnings (losses) recognized in other comprehensive income (494) 67 (264)
Cash flow hedges | Interest rate risk      
Disclosure of detailed information about hedged items [line items]      
Earnings (losses) recognized in other comprehensive income (494) 69 (263)
Amounts transferred to income statements (269) (118) (8)
Gain or loss in value CFE - recognized in equity (225) 185 (256)
Cash flow hedges | Exchange rate risk      
Disclosure of detailed information about hedged items [line items]      
Earnings (losses) recognized in other comprehensive income 155 (194) 146
Cash flow hedges | Exchange rate risk      
Disclosure of detailed information about hedged items [line items]      
Earnings (losses) recognized in other comprehensive income 155 (194) 145
Amounts transferred to income statements 262 132 364
Gain or loss in value CFE - recognized in equity (107) (326) (218)
Cash flow hedges | Interest rate and exchange rate risk      
Disclosure of detailed information about hedged items [line items]      
Earnings (losses) recognized in other comprehensive income (350) 170 168
Amounts transferred to income statements 350 (844) 769
Gain or loss in value CFE - recognized in equity (700) 1,014 (601)
Cash flow hedges | Inflation risk      
Disclosure of detailed information about hedged items [line items]      
Earnings (losses) recognized in other comprehensive income (249) (121) (44)
Amounts transferred to income statements 458 (21) (13)
Gain or loss in value CFE - recognized in equity (707) (100) (31)
Cash flow hedges | Equity risk      
Disclosure of detailed information about hedged items [line items]      
Earnings (losses) recognized in other comprehensive income (3) 9 2
Amounts transferred to income statements 0 0 0
Gain or loss in value CFE - recognized in equity (3) 9 2
Hedges of net investment in foreign operations      
Disclosure of detailed information about hedged items [line items]      
Earnings (losses) recognized in other comprehensive income   3 0
Amounts transferred to income statements   0 0
Non-controlling interest 92 56 32
Taxes 278 5 (17)
Hedges of net investment in foreign operations | Exchange rate risk      
Disclosure of detailed information about hedged items [line items]      
Earnings (losses) recognized in other comprehensive income 0 3 0
Amounts transferred to income statements 0 0 0
Gain or loss in value CFE - recognized in equity € 0 € 3 € 0