Financial Risk Factors and Risk Management - Movement in ECL Allowance for Trade Receivables and Contract Assets (Details) - Trade receivables and contract assets - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Movement in ECL Allowance for Trade Receivables and Contract Assets
Balance as at 01/01	€ (261)	€ (175)
Balance as at 12/31	(203)	(261)
Accumulated impairment [member]
Movement in ECL Allowance for Trade Receivables and Contract Assets
Net Credit losses recognized	32	187
Amounts written off	€ 90	€ 101

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

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- Definition

The decrease in financial assets resulting from write-off. [Refer: Financial assets]

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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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