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Accounts Receivable (Detail)
¥ in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Receivables [Abstract]            
Accounts receivable $ 751 ¥ 4,887   ¥ 4,286    
Allowance for doubtful accounts (48) (316) $ (27) (177) ¥ (190) ¥ (94)
Accounts receivable, net $ 703 ¥ 4,571   ¥ 4,109