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Note 13 Financial assets at fair value through other comprehensive income equity instruments (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Investments in equity instruments designated at fair value through other comprehensive income € 1,451 € 1,217 € 1,198 [1]
Subtotal listed equity instruments [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Investments in equity instruments designated at fair value through other comprehensive income 1,231 1,098 1,098
Subtotal listed equity instruments [Member] | National company shares [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Investments in equity instruments designated at fair value through other comprehensive income 1,100 987 960
Subtotal listed equity instruments [Member] | Foreign company shares [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Investments in equity instruments designated at fair value through other comprehensive income 131 111 138
Subtotal listed equity instruments [Member] | UNITED STATES      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Investments in equity instruments designated at fair value through other comprehensive income 27 33 31
Subtotal listed equity instruments [Member] | MEXICO      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Investments in equity instruments designated at fair value through other comprehensive income 79 52 44
Subtotal listed equity instruments [Member] | TURKEY      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Investments in equity instruments designated at fair value through other comprehensive income 9 6 7
Subtotal listed equity instruments [Member] | Other Countries [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Investments in equity instruments designated at fair value through other comprehensive income 17 20 56
Subtotal unlisted equity instruments [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Investments in equity instruments designated at fair value through other comprehensive income 220 119 100
Subtotal unlisted equity instruments [Member] | National company shares [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Investments in equity instruments designated at fair value through other comprehensive income 46 12 12
Subtotal unlisted equity instruments [Member] | Foreign company shares [Member]      
Financial Assets At Fair Value Through Other Comprehensive Income Equity Instruments [Line Items]      
Investments in equity instruments designated at fair value through other comprehensive income € 174 € 106 € 87
[1]
(1) Balances corresponding to 2022 have been restated according to IFRS 17 (see Note 1.3).