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Note 13 Financial assets at fair value through other comprehensive income equity instruments (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Subtotal listed equity instruments [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments € 2,333 € 2,282 € 2,317
Unrealized gains of equity instruments 35 38 87
Unrealized losses of equity instruments (1,154) (1,326) (518)
Fair value of equity instruments 1,214 995 1,886
Subtotal listed equity instruments [Member] | National company shares [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 2,235 2,182 2,181
Unrealized gains of equity instruments 0 0 0
Unrealized losses of equity instruments (1,146) (1,309) (507)
Fair value of equity instruments 1,088 873 1,674
Subtotal listed equity instruments [Member] | Foreign company shares [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 98 100 136
Unrealized gains of equity instruments 35 38 87
Unrealized losses of equity instruments (8) (17) (11)
Fair value of equity instruments 125 121 213
Subtotal listed equity instruments [Member] | UNITED STATES      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 29 27 30
Unrealized gains of equity instruments 0 0 47
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 29 27 78
Subtotal listed equity instruments [Member] | MEXICO      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 1 1 1
Unrealized gains of equity instruments 28 33 33
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 29 34 34
Subtotal listed equity instruments [Member] | TURKEY      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 0 2 3
Unrealized gains of equity instruments 4 4 2
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 5 6 5
Subtotal listed equity instruments [Member] | Other Countries [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 69 70 102
Unrealized gains of equity instruments 2 1 5
Unrealized losses of equity instruments (8) (17) (11)
Fair value of equity instruments 63 54 96
Subtotal unlisted equity instruments [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 60 62 454
Unrealized gains of equity instruments 48 44 80
Unrealized losses of equity instruments (1) (1) (1)
Fair value of equity instruments 107 105 533
Subtotal unlisted equity instruments [Member] | National company shares [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 5 5 5
Unrealized gains of equity instruments 7 1 1
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 11 5 5
Subtotal unlisted equity instruments [Member] | Foreign company shares [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 55 58 450
Unrealized gains of equity instruments 41 43 79
Unrealized losses of equity instruments (1) (1) (1)
Fair value of equity instruments 95 100 528
Subtotal unlisted equity instruments [Member] | UNITED STATES      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 0 0 387
Unrealized gains of equity instruments 0 0 32
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 0 0 419
Subtotal unlisted equity instruments [Member] | MEXICO      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 0 0 0
Unrealized gains of equity instruments 0 0 0
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 1 1 0
Subtotal unlisted equity instruments [Member] | TURKEY      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 3 5 5
Unrealized gains of equity instruments 0 0 4
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 3 5 9
Subtotal unlisted equity instruments [Member] | Other Countries [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 51 52 57
Unrealized gains of equity instruments 41 43 43
Unrealized losses of equity instruments (1) (1) (1)
Fair value of equity instruments 91 94 99
Total [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 2,393 2,344 2,772
Unrealized gains of equity instruments 83 82 167
Unrealized losses of equity instruments (1,155) (1,327) (519)
Fair value of equity instruments € 1,320 € 1,100 € 2,420