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Principal Amount and Unamortized Discount and Debt Issuance Costs (Detail)
¥ in Millions, $ in Millions
Sep. 30, 2018
USD ($)
Sep. 30, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Debt Disclosure [Abstract]      
Principal amount $ 5,999 ¥ 41,207 ¥ 35,782
Unamortized discount and debt issuance cost (30) (209) (171)
Long-term Debt, Total $ 5,969 ¥ 40,998 ¥ 35,611