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Derivative Financial Instruments and Risk Management Policies - Evolution of Derivative Instruments Narrative (Details) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Currency swaps |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Realised and unrealised gains on derivative instruments, net | € 914 | € 135 |
Derivative instruments |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Increase in financial assets | 603 | (613) |
Gain (loss) on derivative | € 1,002 | € 399 | € 1,012

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