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Components of Income Tax (Detail) ¥ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Income Tax Disclosure [Abstract] |  |  |  |
Current income tax | ¥ 3,564 | $ 511 | ¥ 6,184 | ¥ 4,224
Income tax refund due to reduced tax rate | (920) | (132) | (680) | (473)
Adjustments of deferred tax assets due to change in tax rates | 9 | 1 |  | 7
Deferred income tax benefit | (705) | (101) | (761) | (763)
Taxation for the year | ¥ 1,948 | $ 279 | ¥ 4,743 | ¥ 2,995

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