Income tax - (Loss) Income before income tax expense and share of income (loss) in equity method investments (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
Income Tax
(Loss) income before income tax expense and share of income (loss) in equity method investments	¥ (5,738,175)	$ (786,126)	¥ (8,288,920)	¥ (7,355,091)
The People's Republic of China
Income Tax
(Loss) income before income tax expense and share of income (loss) in equity method investments	(5,397,006)		(8,302,693)	(7,480,164)
Netherlands
Income Tax
(Loss) income before income tax expense and share of income (loss) in equity method investments	(434,291)		(107,145)
Sweden
Income Tax
(Loss) income before income tax expense and share of income (loss) in equity method investments	89,231		119,064	131,098
Others
Income Tax
(Loss) income before income tax expense and share of income (loss) in equity method investments	¥ 3,891		¥ 1,854	¥ 7,254

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.