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PRINCIPAL ACCOUNTING POLICIES - Statutory reserves and dividends (Details) - CNY (¥) ¥ in Millions	12 Months Ended
	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%

X

- Definition

Amount of restricted net assets that may be distributed to the parent.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

The amount of net income allocated to statutory reserves for entities incorporated in China.

+ References

No definition available.

+ Details

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X

- 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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X

- 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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X

- Definition

Amount of restricted net assets that may not be distributed to the parent.

+ References

No definition available.

+ Details

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X

- Definition

Schedule of Statutory Reserves [Line Items]

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- 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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Data Type:	num:percentItemType
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X

- References

No definition available.

+ Details

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- Details

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- Details

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