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Business acquisition - Additional information (Detail) - CNY (¥)
¥ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2020
Jun. 30, 2020
Apr. 30, 2020
Apr. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Statement Lineitems [Line Items]            
Finite-Lived Intangible Asset, Useful Life         9 years 7 months 6 days 9 years 6 months
Jiangsu Five Star [Member]            
Statement Lineitems [Line Items]            
Business Acquisition, Transaction Costs       ¥ 1,274    
Business Acquisition, Percentage of Equity Interest       46.00%    
Business Acquisition, Percentage of Equity Interest Acquired   17.00% 37.00%      
Acquisition of equity interest by loan conversion     ¥ 1,025 ¥ 1,025    
Gain On Revaluation of equity interest     442      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash     1,720      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory     1,652      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable     ¥ 4,102      
Finite-Lived Intangible Asset, Useful Life     19 years      
Business Combination, Consideration Transferred, Liabilities Incurred   ¥ 428        
Kuayue Express [Member]            
Statement Lineitems [Line Items]            
Percenatge of ordinary shares acquired 60.20%          
Finite-Lived Intangible Asset, Useful Life 9 years          
Business Combination, Consideration Transferred ¥ 2,966          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 1,376          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt 986          
Business acquisition recognized identifiable assets and liabilities assumed current assets trade receivables 830          
Business acquistion trade receivables gross contractual amount 924          
Business acquisition trade receivables amount not expected to be collected ¥ 94