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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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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 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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