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Treasury risk management - Disclosure of Outstanding Fixed to Float Interest Rate Swaps (Details) € in Millions, $ in Millions	Dec. 31, 2023 EUR (€) USD ($)	Dec. 31, 2022 EUR (€) USD ($)
Cash flow hedges
Disclosure of detailed information about hedges [line items]
Nominal amount of hedging instrument	1,416	991
Interest rate swap contract | Cash flow hedges | Interest rate risk
Disclosure of detailed information about hedges [line items]
Nominal amount of hedging instrument	2,605	1,923
Interest rate swap contract | Fair value hedges | Interest rate risk
Disclosure of detailed information about hedges [line items]
Nominal amount of hedging instrument	3,566	3,606
EUR | Cash flow hedges
Disclosure of detailed information about hedges [line items]
Nominal amount of hedging instrument	951	958
EUR | Interest rate swap contract | Cash flow hedges | Interest rate risk
Disclosure of detailed information about hedges [line items]
Nominal amount of hedging instrument	1,250	0
EUR | Interest rate swap contract | Fair value hedges | Interest rate risk
Disclosure of detailed information about hedges [line items]
Nominal amount of hedging instrument	2,000	2,000
USD | Cash flow hedges
Disclosure of detailed information about hedges [line items]
Nominal amount of hedging instrument	363	764
USD | Interest rate swap contract | Cash flow hedges | Interest rate risk
Disclosure of detailed information about hedges [line items]
Nominal amount of hedging instrument | $	1,355	1,923
USD | Interest rate swap contract | Fair value hedges | Interest rate risk
Disclosure of detailed information about hedges [line items]
Nominal amount of hedging instrument	1,220	1,267
GBP | Cash flow hedges
Disclosure of detailed information about hedges [line items]
Nominal amount of hedging instrument	372	408
GBP | Interest rate swap contract | Fair value hedges | Interest rate risk
Disclosure of detailed information about hedges [line items]
Nominal amount of hedging instrument	346	339

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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.

+ References

No definition available.

+ Details

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- Definition

The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 23B
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_23B_a&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24A
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24A_d&doctype=Standard
-URIDate 2023-03-23

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