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Schedule of Unrealized and Realized Gains and Losses of Equity Securities Without Readily Determinable Fair Values (Parenthetical) (Detail) ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥)
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract] |  |  |
Equity securities gross unrealised loss excluding impairment | ¥ 863 | $ 124 | ¥ 2,412

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