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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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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

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- Definition

The increase (decrease) in financial assets. [Refer: Financial assets]

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