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Movement in Allowance for Doubtful Accounts (Detail)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Allowance for Doubtful Accounts        
Balance as of January 1 ¥ 599 $ 86 ¥ 316 ¥ 177
Amounts charged to expenses 331 47 299 190
Amounts written off (2)   (16) (51)
Balance as of December 31 ¥ 928 $ 133 ¥ 599 ¥ 316