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Derivative Financial Instruments - Disclosure of Financial Currency Hedging Instruments in Place with Notional Amount Translated (Details) € in Millions, $ in Millions, $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2023 EUR (€)	Jun. 30, 2022 EUR (€)	Dec. 31, 2022 EUR (€)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 SGD ($)
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Change in fair value of cash flow hedges	€ 1	€ (17)	€ 7
Forward currency sales in US dollar
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Notional amount | $				$ 3,615
Derivative financial assets	9
Forward currency sales in Singapore dollar
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Notional amount | $					$ 2,000
Derivative financial assets	0
Forward currency purchases in Singapore dollar
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Notional amount | $					$ 1,260
Derivative financial assets	11
Change in fair value of cash flow hedges	3
Forward currency purchases in US dollar, US bond
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Notional amount | $				1,000
Derivative financial liabilities	10
Change in fair value of cash flow hedges	2
Forward currency purchases in US dollar, commercial paper
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Notional amount | $				$ 1,782
Derivative financial assets	8
Change in fair value of cash flow hedges	0
Notional amount
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	17,392
Notional amount | Forward currency sales
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	8,935
Notional amount | Forward currency sales in US dollar | 2024
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	6,147
Notional amount | Forward currency sales in Singapore dollar | 2023
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	1,355
Notional amount | Forward currency sales in Pound sterling | 2023
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	466
Notional amount | Forward currency purchases
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	8,457
Notional amount | Forward currency purchases in US dollar | 2024
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	5,106
Notional amount | Forward currency purchases in Singapore dollar | 2023
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	2,689
Notional amount | Forward currency purchases in Japanese Yen | 2023
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	320
Fair value
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	(1)
Fair value | Forward currency sales
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	17
Fair value | Forward currency sales in US dollar | 2024
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	4
Fair value | Forward currency sales in Singapore dollar | 2023
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	0
Fair value | Forward currency sales in Pound sterling | 2023
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	0
Fair value | Forward currency purchases
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	(18)
Fair value | Forward currency purchases in US dollar | 2024
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	(13)
Fair value | Forward currency purchases in Singapore dollar | 2023
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	(7)
Fair value | Forward currency purchases in Japanese Yen | 2023
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]
Financial currency hedging instruments in place	€ (2)

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- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax, before reclassification adjustments. [Refer: Cash flow hedges [member]]

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