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PRINCIPAL ACCOUNTING POLICIES - Statutory reserves and dividends (Details) - CNY (¥) ¥ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
China |  |  |
Statutory reserves disclosures |  |  |
Portion of after-tax profit to be allocated to general reserve under PRC law (as a percent) | 10.00% |  |
Maximum percentage of statutory general reserve related to entity's registered capital | 50.00% |  |
Appropriations to statutory reserves | ¥ 146 | ¥ 69 | ¥ 35
Dividends |  |  |
Restricted net assets of company's PRC subsidiaries and VIEs not distributable in form of dividends to parent | 5,700 |  |
Accumulated profit of subsidiaries in PRC distributable in form of dividends to parent | ¥ 12,000 | ¥ 8,000 | ¥ 7,000
Withholding tax rate for dividends distributed by foreign invested enterprise to their immediate holding companies outside mainland china (as a percent) | 10.00% |  |
Taiwan |  |  |
Statutory reserves disclosures |  |  |
Portion of after-tax profit to be allocated to general reserve under PRC law (as a percent) | 10.00% |  |

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- Definition Amount of restricted net assets that may be distributed to the parent. + References No definition available. + Details
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- Definition The amount of net income allocated to statutory reserves for entities incorporated in China. + References No definition available. + Details
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- Definition For entities incorporated in PRC or its province, the minimum percentage of the after-tax net income allocated to a statutory reserve until the reserve balance is a specified percentage of the registered capital. + References No definition available. + Details
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- Definition For entities incorporated in PRC, the ratio of the statutory reserve to the registered capital which triggers the elimination of the requirement to contribute to the statutory reserve. + References No definition available. + Details
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- Definition Amount of restricted net assets that may not be distributed to the parent. + References No definition available. + Details
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- Definition Schedule of Statutory Reserves [Line Items] + References No definition available. + Details
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- Definition Withholding Tax Rate for Dividends Distributed by Foreign Invested Enterprise to Their Immediate Holding Companies Outside Mainland China + References No definition available. + Details
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- References No definition available. + Details
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- Details
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- Details
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Period Type: |