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Share repurchase program (Details) ¥ in Millions, $ in Millions			12 Months Ended
	Aug. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 CNY (¥) shares	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 CNY (¥) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 CNY (¥) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Nov. 30, 2021 USD ($)
Shares repurchased during the year \| ¥			¥ 25,912		¥ 2,497		¥ 1,823
ADS \| 2020 Share repurchase program
Shares repurchased during the year (in ADS shares) \| shares			127,639,089	127,639,089	11,339,490	11,339,490	5,010,203	5,010,203
Shares repurchased during the year				$ 3,645		$ 356		$ 286
Share Repurchase Authorization									$ 3,000	$ 2,000
ADS \| 2024 Share repurchase program
Authorized amount		$ 3,000
Repurchase period (in months)		36 months
ADS \| New 2024 Share repurchase program
Authorized amount	$ 5,000
Repurchase period (in months)	36 months