Material related party transactions - Summary of Name and Relationship With Related Parties (Details)	6 Months Ended
Jun. 30, 2025
Dr. Tony Xu Han \| Founder, Chairman, Executive Director and CEO
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Founder, Chairman, Executive Director and CEO
Mr. Yan Li \| Co-founder, Executive Director and Chief Technology Officer
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Co-founder, Executive Director and Chief Technology Officer
Mr. Hua Zhong \| Senior Vice President
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Senior Vice President
Ms. Jennifer Xuan Li \| Chief Financial Officer and Head of International
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Chief Financial Officer and Head of International
Mr. Qingxiong Yang \| Vice President
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Vice President
Mr. Jean-Franois Salles \| Non-Executive Director
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Non-Executive Director
Mr. Kazuriho Doi \| Non-Executive Director
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Non-Executive Director
Mr. David Tong Zhang \| Independent Director
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Independent Director
Ms. Huiping Yan \| Independent Director
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Independent Director
Mr. Gregoire de Franqueville \| Former Non-Executive Director
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Former Non-Executive Director
Mr. Takao Asami \| Former Non-Executive Director
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Former Non-Executive Director
Mr. Yibing Xu \| Former Non-Executive Director
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Former Non-Executive Director
Mr. Jingzhao Wan \| Former Non-Executive Director
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Former Non-Executive Director
Mr. Ziping Kuang \| Former Non-Executive Director
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Former Non-Executive Director
Mohamed Albadrsharif Shaikh Abubaker Alshateri \| Former Non-Executive Director
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Former Non-Executive Director
Alliance Automotive R&D (Shanghai) Co., Ltd \| Affiliate of a shareholder
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Affiliate of a shareholder
Zhengzhou Yutong Bus Co., Ltd \| Affiliate of a shareholder
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Affiliate of a shareholder
Guangzhou Yuji Technology Co., Ltd. and its subsidiaries (collectively "Yuji affiliates") \| Entity controlled by a close family member of Dr. Tony Xu Han
Disclosure of transactions between related parties [line items]
Description of nature of related party relationship	Entity controlled by a close family member of Dr. Tony Xu Han