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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, 2024

Dec. 31, 2023

Disclosure of transactions between related parties [line items]

Investments accounted for using the equity method

€ 315

€ 424

Subordinated liabilities

€ 200

EUROAPI

Disclosure of transactions between related parties [line items]

Proportion of ownership interest in associate

^[1]

29.80%

Investments in associates

^[1]

€ 72

€ 162

EUROAPI

Disclosure of transactions between related parties [line items]

Stock price (in euro per share)

€ 2.55

€ 5.73

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

^[2]

31.20%

Investments in joint ventures

^[2]

€ 89

€ 90

MSP Vaccine Company

Disclosure of transactions between related parties [line items]

Proportion of ownership interest in joint venture

^[3]

50.00%

Investments in joint ventures

^[3]

€ 90

96

Other investments

Disclosure of transactions between related parties [line items]

Proportion of ownership interest in joint venture

0.00%

Investments in joint ventures

€ 64

€ 76

[1]	(a)The investment in EUROAPI includes an impairment loss determined by reference to the quoted market price (€2.55 as of June 30, 2024, and €5.73 as of December 31, 2023).
[2]	Joint venture.
[3]	Joint venture MSP Vaccine Company owns 100% of MCM Vaccine BV

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