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PRINCIPAL ACCOUNTING POLICIES - Earnings/(loss) per share, treasury stock and segment reporting (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 item	Dec. 31, 2015	Nov. 30, 2015	Apr. 30, 2014 USD ($)
Treasury stock disclosures
Approved repurchase plan | $				$ 600
Segment reporting disclosures
Number of reportable segments | item	1
ADS
Treasury stock disclosures
Ratio of ADSs to ordinary shares		8	4

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- Definition

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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- Definition

Amount of stock repurchase plan authorized.

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