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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.