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Principal Amount and Unamortized Discount and Debt Issuance Costs (Detail)
¥ in Millions, $ in Millions
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Debt Disclosure [Abstract]      
Principal amount ¥ 43,519 $ 6,251 ¥ 49,867
Unamortized discount and debt issuance costs (210) (30) (261)
Long-term Debt, Total ¥ 43,309 $ 6,221 ¥ 49,606