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Related Party Transactions - Additional Information (Detail)
¥ in Millions, $ in Millions
6 Months Ended
Jun. 30, 2020
CNY (¥)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
CNY (¥)
Related Party Transaction [Line Items]      
Revenue from related parties ¥ 1,400 $ 197 ¥ 1,600
Cost from related parties ¥ 661 $ 94 ¥ 1,100