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Investments Accounted for Using the Equity Method - Summary of Investments in Associates and Joint Ventures (Details) - EUR (€) € / shares in Units, € in Millions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Disclosure of transactions between related parties [line items]
Investments accounted for using the equity method	€ 538	€ 677
EUROAPI
Disclosure of transactions between related parties [line items]
Proportion of ownership interest in associate	29.80%
Investments in associates	€ 297	392
Impairment loss recognised in profit or loss	€ 91
EUROAPI
Disclosure of transactions between related parties [line items]
Stock price (in euro per share)	€ 10.50
MSP Vaccine Company | MCM Vaccine BV
Disclosure of transactions between related parties [line items]
Proportion of ownership interest in subsidiary	100.00%
Infraserv GmbH & Co. Höchst KG
Disclosure of transactions between related parties [line items]
Proportion of ownership interest in joint venture	31.20%
Investments in joint ventures	€ 88	97
MSP Vaccine Company
Disclosure of transactions between related parties [line items]
Proportion of ownership interest in joint venture	50.00%
Investments in joint ventures	€ 95	104
Other investments
Disclosure of transactions between related parties [line items]
Proportion of ownership interest in joint venture	0.00%
Investments in joint ventures	€ 58	€ 84

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The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

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The amount of investments in associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method]

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