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Leases -Summary of Supplemental cash flow information (Detail) - 12 months ended Dec. 31, 2019
¥ in Millions, $ in Millions
CNY (¥)
USD ($)
Leases [Abstract]    
Cash payments for operating leases ¥ 2,631 $ 378
ROU assets obtained in exchange for operating lease liabilities ¥ 3,896 $ 560