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Reconciliation of Effective Income Tax Provision of Tax Computed By Applying Statutory Income Tax Rate to Pre-Tax Income (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 CNY (¥) ¥ / shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 CNY (¥) ¥ / shares | Dec. 31, 2021 CNY (¥) ¥ / shares
Income Tax Disclosure [Abstract] |  |  |  |
Expected taxation at PRC statutory tax rate | ¥ 6,299 | $ 887 | ¥ 2,541 | ¥ 2,694
Effect of differing tax rates in different jurisdictions | 410 | 58 | 1,976 | 656
Non-taxable income | (456) | (64) | (44) | (89)
Non-deductible expenses | 1,928 | 272 | 534 | 965
Research and development super-deduction | (3,067) | (432) | (2,274) | (1,645)
Effect of PRC preferential tax rates and tax holiday | (1,833) | (259) | (1,507) | (1,557)
Effect of tax rate changes on deferred taxes | 111 | 16 | 119 | 109
Reversal of prior year's income taxes | (156) | (22) | (913) | (734)
PRC withholding tax | 574 | 81 | 181 | 615
Change in valuation allowance | (161) | (23) | 1,965 | 2,173
Taxation for the year | ¥ 3,649 | $ 514 | ¥ 2,578 | ¥ 3,187
Effective tax rate | 14.50% | 14.50% | 25.50% | 29.60%
Effect of preferential tax rates inside the PRC on basic earnings per Class A and Class B ordinary share | (per share) | ¥ 0.65 | $ 0.09 | ¥ 0.54 | ¥ 0.56

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