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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 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. + References No definition available. + Details
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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. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Details
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