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Accounts Receivable (Detail)
¥ in Millions, $ in Millions
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Receivables [Abstract]            
Accounts receivable ¥ 8,344 $ 1,198 ¥ 6,614      
Allowance for doubtful accounts (928) (133) (599) $ (86) ¥ (316) ¥ (177)
Accounts receivable, net ¥ 7,416 $ 1,065 ¥ 6,015