Segment information - Summary of Disaggregation of Sales by Markets (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	€ 60,761	€ 59,604	€ 60,073
Emerging markets
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	35,313	34,714	35,324
Developed markets
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	€ 25,448	€ 24,890	€ 24,749

The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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+ Details