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Loss per share - Schedule of basic and diluted net loss per share (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2023 CNY (¥) ¥ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 CNY (¥) ¥ / shares shares	Dec. 31, 2021 CNY (¥) ¥ / shares shares
Numerator:
Net loss attributable to ECARX Holdings Inc.		¥ (940,191)	$ (132,423)	¥ (1,564,878)	¥ (1,175,261)
Accretion of Redeemable Convertible Preferred Shares		0	0	354,878	243,564
Numerator for basic and diluted net loss per share calculation		¥ (940,191)	$ (132,423)	¥ (1,919,756)	¥ (1,418,825)
Denominator:
Weighted average number of ordinary shares, basic (in shares)	[1]	337,407,225	337,407,225	239,296,386	236,691,093
Weighted average number of ordinary shares, diluted (in shares)	[1]	337,407,225	337,407,225	239,296,386	236,691,093
Basic loss per share, ordinary shares (in RMB per share) | (per share)	[1]	¥ (2.79)	$ (0.39)	¥ (8.02)	¥ (5.99)
Diluted loss per share, ordinary shares (in RMB per share) | (per share)	[1]	¥ (2.79)	$ (0.39)	¥ (8.02)	¥ (5.99)
[1] Shares outstanding for all periods reflect the adjustment for Recapitalization.

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