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Principal Amount and Unamortized Discount and Debt Issuance Costs (Detail)
¥ in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Debt Disclosure [Abstract]      
Principal amount $ 5,500 ¥ 35,782 ¥ 32,988
Unamortized discount and debt issuance costs (27) (171) (137)
Long-term Debt, Total $ 5,473 ¥ 35,611 ¥ 32,851