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Note 12 Financial assets at fair value through other comprehensive income equity instruments (Details) - EUR (€)
€ in Millions
Jun. 30, 2022
Dec. 31, 2021
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]    
Cost of equity instruments € 2,351 € 2,393
Fair value of equity instruments 1,612 1,320
Subtotal listed equity instruments [Member]    
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]    
Cost of equity instruments 2,323 2,333
Fair value of equity instruments 1,491 1,214
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
Fair value of equity instruments 1,374 1,088
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 88 98
Fair value of equity instruments 116 125
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 29
Fair value of equity instruments 29 29
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
Fair value of equity instruments 30 29
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
Fair value of equity instruments 4 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 58 69
Fair value of equity instruments 53 63
Subtotal unlisted equity instruments [Member]    
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]    
Cost of equity instruments 28 60
Fair value of equity instruments 121 107
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
Fair value of equity instruments 12 11
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 22 55
Fair value of equity instruments 109 95
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
Fair value of equity instruments 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 3 3
Fair value of equity instruments 3 3
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
Fair value of equity instruments € 105 € 91