Financial Risk Factors and Risk Management - Designated Hedged Items in Interest Rate Hedges (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
FINANCIAL RISK FACTORS
Carrying amount	€ 7,755	€ 11,764
Interest Rate Risk \| Interest Rate Hedges \| Fixed-Rate Borrowing in EUR
FINANCIAL RISK FACTORS
Notional amount	4,550	4,550
Carrying amount	3,964	3,732
Accumulated fair value adjustments in Other financial liabilities	556	782
Change in fair value used for measuring ineffectiveness for the reporting period	226	(723)
Accumulated amount of fair value hedge adjustments for hedged items ceased to be adjusted for hedging gains/losses	0	0
Interest Rate Risk \| Interest Rate Hedges \| Fixed-Rate Borrowing in USD
FINANCIAL RISK FACTORS
Notional amount	90	94
Carrying amount	89	95
Accumulated fair value adjustments in Other financial liabilities	(6)	(9)
Change in fair value used for measuring ineffectiveness for the reporting period	1	(11)
Accumulated amount of fair value hedge adjustments for hedged items ceased to be adjusted for hedging gains/losses	€ (7)	€ (11)

The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as a liability. [Refer: Hedged items [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24B
-Subparagraph a
-Clause ii
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-URIDate 2023-03-23

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- Definition

The accumulated amount of fair value hedge adjustment remaining in the statement of financial position for a hedged item that is a financial liability measured at amortised cost and has ceased to be adjusted for hedging gains and losses. [Refer: Financial liabilities at amortised cost; Hedged items [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24B
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-URIDate 2023-03-23

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- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
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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.

+ References

No definition available.

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 112
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2023-03-23

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- Definition

The change in the amount of value used for calculating hedge effectiveness.

+ References

No definition available.

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