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Components of Income Tax (Detail) ¥ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Income Tax Disclosure [Abstract] |  |  |  |
Current income tax | $ 649 | ¥ 4,224 | ¥ 3,462 | ¥ 3,214
Income tax refund due to reduced tax rate | (73) | (473) | (535) | 0
Adjustments of deferred tax assets due to change in tax rates | 1 | 7 | (13) | 80
Deferred income tax (benefit) expense | (117) | (763) | (1) | 2,181
Taxation for the year | $ 460 | ¥ 2,995 | ¥ 2,913 | ¥ 5,475

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