Income Taxes - Major Components of Tax Expense (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes
Tax expense for current year	€ 1,935	€ 1,717	€ 1,702
Taxes for prior years	17	(13)	267
Total current tax expense	1,952	1,704	1,969
Origination and reversal of temporary differences	(222)	(216)	(311)
Unused tax losses, research and development tax credits, and foreign tax credits	11	(42)	24
Total deferred tax expense/income	(211)	(258)	(287)
Total income tax expense	€ 1,741	€ 1,446	€ 1,682

Adjustments of tax expense (income) recognised in the period for current tax of prior periods.

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

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The amount of current tax expense (income) and adjustments for the current tax of prior periods. [Refer: Current tax expense (income); Adjustments for current tax of prior periods]

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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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The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)]

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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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The amount of unused tax losses and credits for which no deferred tax asset.

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