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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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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations exclude adjustments of deferred tax assets due to reduced tax rates.

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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