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Schedule of Unrealized and Realized Gains and Losses of Equity Securities Without Readily Determinable Fair Values (Detail) ¥ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2023 USD ($)
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract] |  |  |  |  |  |
Initial cost basis |  | ¥ 13,586 |  | ¥ 13,741 |  | $ 1,914
Cumulative unrealized gains |  | 3,099 |  | 4,026 |  | 436
Cumulative unrealized losses (including impairment) |  | (8,592) |  | (8,518) |  | (1,210)
Total carrying value |  | 8,093 |  | 9,249 |  | $ 1,140
Gross unrealized gains |  | 571 | $ 80 | 218 | ¥ 1,062 |
Gross unrealized losses (including impairment) | [1] | (744) | (105) | (2,418) | (4,424) |
Net unrealized losses on equity securities held |  | (173) | (25) | (2,200) | (3,362) |
Net realized gains on equity securities sold |  | 251 | 35 | 90 |  |
Total net (losses) gains recognized |  | ¥ 78 | $ 10 | ¥ (2,110) | ¥ (3,362) |
[1] | Gross unrealized losses (downward adjustments excluding impairment) were RMB165 million, nil and RMB8 million (US$1 million) for the years ended December 31, 2021, 2022 and 2023, respectively.

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