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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, 2019 CNY (¥) ¥ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 CNY (¥) ¥ / shares | Dec. 31, 2017 CNY (¥) ¥ / shares
Income Tax Disclosure [Abstract] |  |  |  |
Expected taxation at PRC statutory tax rate | ¥ (85) | $ (12) | ¥ 6,831 | ¥ 5,321
Effect of differing tax rates in different jurisdictions | 3,299 | 474 | 493 | 854
Non-taxable income | (419) | (60) | (1,555) | (913)
Non-deductible expenses | 2,124 | 305 | 935 | 653
Research and development super-deduction | (1,245) | (179) | (1,047) | (905)
Effect of PRC preferential tax rates and tax holiday | (1,327) | (191) | (2,250) | (2,095)
Effect of tax rate changes on deferred taxes | 9 | 1 | 0 | 7
Reversal of prior year's EIT | (1,134) | (163) | (616) | (579)
PRC withholding tax | (224) | (32) | 553 | 101
Addition to valuation allowance | 950 | 136 | 1,399 | 551
Taxation for the year | ¥ 1,948 | $ 279 | ¥ 4,743 | ¥ 2,995
Effective tax rate | (573.00%) | (573.00%) | 17.00% | 14.00%
Effect of preferential tax rates inside the PRC on basic earnings per Class A and Class B ordinary share | (per share) | ¥ 38.09 | $ 5.47 | ¥ 64.47 | ¥ 60.33

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