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Fair Value Disclosure and Measurement (Detail) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 CNY (¥)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term investments	$ (92)	¥ (597)	¥ (245)	¥ (117)
Fair value disclosure
Intangible assets	(81)	(529)	(213)	0
Total losses	(362)	(2,358)	(421)	¥ (117)
Long-term notes payable	5,524		33,253		¥ 35,943
Fair value measurements
Other invested securities	2,820		7,748		18,350
Derivative Instruments	26				168
Total assets measured at fair value	9,578		37,639		62,327
Short-term Investments | Fixed-rate Investments
Fair value disclosure
Fixed-rate held-to-maturity investments	7,484		41,868		48,695
Fair value measurements
Available-for-sale investments, current	4,614		14,378		30,022
Short-term Investments | Adjustable-rate Debt Investments
Fair value measurements
Available-for-sale investments, current	1,643		14,987		10,693
Short-term Investments | Equity Investments
Fair value measurements
Available-for-sale investments, current			29
Other Long-term Investments
Fair value measurements
Investment accounted for at fair value	49				321
Other Long-term Investments | Equity Investments
Fair value measurements
Available-for-sale investments, noncurrent	426		497		2,773
Time Deposits
Fair value disclosure
Cash equivalents	20		1,674		130
Money Market Fund
Fair value disclosure
Cash equivalents	366		4,419		2,384
Fair Value, Inputs, Level 3
Fair value measurements
Total assets measured at fair value			3		800
Fair Value, Inputs, Level 1
Fair value measurements
Total assets measured at fair value			526		2,773
Fair Value, Inputs, Level 1 | Money Market Fund
Fair value disclosure
Cash equivalents			4,419		2,384
Fair Value, Inputs, Level 2
Fair value disclosure
Long-term notes payable			33,253		35,943
Fair value measurements
Derivative Instruments					168
Total assets measured at fair value			37,113		59,233
Fair Value, Inputs, Level 2 | Short-term Investments | Fixed-rate Investments
Fair value disclosure
Fixed-rate held-to-maturity investments			41,868		48,695
Fair Value, Inputs, Level 2 | Time Deposits
Fair value disclosure
Cash equivalents			1,674		130
Fair Value, Measurements, Nonrecurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term investments	(88)	(575)	(151)
Fair value disclosure
Intangible assets	(21)	(139)	(1)
Fixed assets	(11)	(70)
Other non-current assets	(6)	(37)
Total losses	(126)	¥ (821)	(152)
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair value measurements
Long-term investments			3		203
Intangible assets			0		272
Fixed assets					0
Other non-current assets					4
Fair Value, Measurements, Recurring
Fair value measurements
Other invested securities	2,820		7,748		18,350
Fair Value, Measurements, Recurring | Short-term Investments | Fixed-rate Investments
Fair value measurements
Available-for-sale investments, current	4,614		14,378		30,022
Fair Value, Measurements, Recurring | Short-term Investments | Adjustable-rate Debt Investments
Fair value measurements
Available-for-sale investments, current	1,643		14,987		10,693
Fair Value, Measurements, Recurring | Short-term Investments | Equity Investments
Fair value measurements
Available-for-sale investments, current			29
Fair Value, Measurements, Recurring | Other Long-term Investments
Fair value measurements
Investment accounted for at fair value	49				321
Fair Value, Measurements, Recurring | Other Long-term Investments | Equity Investments
Fair value measurements
Available-for-sale investments, noncurrent	$ 426		497		2,773
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Other Long-term Investments
Fair value measurements
Investment accounted for at fair value					321
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Short-term Investments | Equity Investments
Fair value measurements
Available-for-sale investments, current			29
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other Long-term Investments | Equity Investments
Fair value measurements
Available-for-sale investments, noncurrent			497		2,773
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair value measurements
Other invested securities			7,748		18,350
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Short-term Investments | Fixed-rate Investments
Fair value measurements
Available-for-sale investments, current			14,378		30,022
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Short-term Investments | Adjustable-rate Debt Investments
Fair value measurements
Available-for-sale investments, current			¥ 14,987		¥ 10,693

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value of investments in debt securities classified as held-to-maturity.

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Fair value portion of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount of investments in debt securities classified as trading.

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