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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

8 Months Ended

12 Months Ended

Dec. 31, 2022

Dec. 31, 2024

Dec. 31, 2023

Disclosure of transactions between related parties [line items]

Investments in subsidiaries, joint ventures and associates

€ 677

€ 316

€ 424

EUROAPI

Disclosure of transactions between related parties [line items]

Stock price

€ 2.88

€ 5.73

Infraserv GmbH & Co. Höchst KG

Disclosure of transactions between related parties [line items]

Proportion of ownership interest in joint venture (in percent)

^[1]

31.20%

Investments in joint ventures

^[1]

97

€ 102

€ 90

MSP Vaccine Company (formerly MCM company)

Disclosure of transactions between related parties [line items]

Proportion of ownership interest in joint venture (in percent)

^[2]

50.00%

Investments in joint ventures

^[2]

104

€ 81

96

Other investments

Disclosure of transactions between related parties [line items]

Proportion of ownership interest in joint venture (in percent)

0.00%

Investments in joint ventures

€ 84

€ 51

76

EUROAPI

Disclosure of transactions between related parties [line items]

Proportion of ownership interest in associate (in percent)

30.10%

29.60%

^[3]

Investments in joint ventures

^[3]

€ 392

€ 82

€ 162

Impairment loss recognised in profit or loss

€ (77)

MCM Vaccine BV | MSP Vaccine Company (formerly MCM company)

Disclosure of transactions between related parties [line items]

Proportion of ownership interest in joint venture (in percent)

100.00%

[1]	(b)Joint venture.
[2]	(c)Joint venture. MSP Vaccine Company owns 100% of MCM Vaccine BV
[3]	(a) The investment in EUROAPI includes an impairment loss determined by reference to the quoted market price (€2.88 as of December 31, 2024, and €5.73 as of December 31, 2023)

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