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Summary of Loans and Interest Receivable (Detail) ¥ in Millions, $ in Millions	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Accounts, Notes, Loans and Financing Receivable, Classified [Abstract]
Loans and interest receivable, current	$ 3,780	¥ 24,598	¥ 1,849
Allowance for credit losses	(101)	(660)	(49)
Net loans and interest receivable, current	3,679	23,938	1,800
Loans and interest receivable, non-current	549	3,571	2,778
Allowance for credit losses	(16)	(104)	(69)
Net loans and interest receivable, non-current	$ 533	¥ 3,467	¥ 2,709

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A valuation allowance relating to a written agreement to receive money (at a specified future date(s) within one year from the reporting date (or the normal operating cycle, whichever is longer), consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

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A valuation allowance relating to a written agreement to receive money (at a specified future date(s) more than one year from the reporting date, consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) within one year of the balance sheet date or the normal operating cycle, whichever is longer. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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