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Notes payable - Summary of unsecured senior notes (Detail)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Disclosure of Detailed Information Unsecured Senior Notes [Line Items]      
Principal amount | $   $ 800  
Borrowings | ¥ ¥ 5,536   ¥ 5,062
Senior Notes Tranch one [Member]      
Disclosure of Detailed Information Unsecured Senior Notes [Line Items]      
Principal amount | $   $ 300  
Borrowings | ¥ ¥ 2,082   1,903
Interest rate 1.375% 1.375%  
Borrowings maturity 2025    
Senior Notes Tranch Two [Member]      
Disclosure of Detailed Information Unsecured Senior Notes [Line Items]      
Principal amount | $   $ 500  
Borrowings | ¥ ¥ 3,454   ¥ 3,159
Interest rate 2.00% 2.00%  
Borrowings maturity 2030