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Note 13 Financial assets at fair value through other comprehensive income equity instruments (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Subtotal listed equity instruments [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments € 2,336 € 2,333 € 2,282
Unrealized gains of equity instruments 44 35 38
Unrealized losses of equity instruments (1,282) (1,154) (1,326)
Fair value of equity instruments 1,098 1,214 995
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 2,235 2,182
Unrealized gains of equity instruments 0 0 0
Unrealized losses of equity instruments (1,274) (1,146) (1,309)
Fair value of equity instruments 960 1,088 873
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 102 98 100
Unrealized gains of equity instruments 44 35 38
Unrealized losses of equity instruments (8) (8) (17)
Fair value of equity instruments 138 125 121
Subtotal listed equity instruments [Member] | UNITED STATES      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 43 29 27
Unrealized gains of equity instruments 0 0 0
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 44 29 27
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 30 28 33
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 31 29 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 0 2
Unrealized gains of equity instruments 7 4 4
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 7 5 6
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 57 69 70
Unrealized gains of equity instruments 7 2 1
Unrealized losses of equity instruments (8) (8) (17)
Fair value of equity instruments 56 63 54
Subtotal unlisted equity instruments [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 31 60 62
Unrealized gains of equity instruments 71 48 44
Unrealized losses of equity instruments (2) (1) (1)
Fair value of equity instruments 100 107 105
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 6 5 5
Unrealized gains of equity instruments 7 7 1
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 12 11 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 25 55 58
Unrealized gains of equity instruments 64 41 43
Unrealized losses of equity instruments (2) (1) (1)
Fair value of equity instruments 87 95 100
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 0
Unrealized gains of equity instruments 0 0 0
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 0 0 0
Subtotal unlisted equity instruments [Member] | MEXICO      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 1 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 1
Subtotal unlisted equity instruments [Member] | TURKEY      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 6 3 5
Unrealized gains of equity instruments 0 0 0
Unrealized losses of equity instruments 0 0 0
Fair value of equity instruments 6 3 5
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 19 51 52
Unrealized gains of equity instruments 64 41 43
Unrealized losses of equity instruments (2) (1) (1)
Fair value of equity instruments 81 91 94
Total [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Cost of equity instruments 2,367 2,393 2,344
Unrealized gains of equity instruments 115 83 82
Unrealized losses of equity instruments (1,284) (1,155) (1,327)
Fair value of equity instruments € 1,198 € 1,320 € 1,100