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Income tax expense - Summary of Allocation of Income Tax Expense Between Current and Deferred Taxes (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Abstract]
Current taxes	€ (2,560)	€ (2,774)	€ (1,908)
Deferred taxes	958	768	350
Total	(1,602)	(2,006)	(1,558)
Income before tax and investments accounted for using the equity method	€ 7,153	€ 10,422	€ 7,798

X

- Definition

The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

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- Definition

The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities]

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- Definition

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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Income before tax and investments accounted for equity method investments.

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Income Taxes [Abstract]

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