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Investments accounted for using the equity method - Summary of Share of Profit or Loss and Other Comprehensive Income of Associates and Joint Ventures (Details) - EUR (€) € / shares in Units, € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
EUROAPI |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Stock price |  | € 2.88 | € 5.73 |
Joint ventures |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Share of profit/(loss) from investments accounted for using the equity method | [1] | € 134 | € 101 | € 73
Share of other comprehensive income from investments accounted for using the equity method |  | 3 | (7) | (3)
Total |  | 137 | 94 | 70
Associates |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Share of profit/(loss) from investments accounted for using the equity method | [1] | (74) | (237) | (18)
Share of other comprehensive income from investments accounted for using the equity method |  | (5) | 7 | (1)
Total |  | (79) | € (230) | € (19)
EUROAPI |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Impairment loss recognised in profit or loss |  | € (77) |  |
[1] | (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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