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PRINCIPAL ACCOUNTING POLICIES - Property, equipment and software (Details)	12 Months Ended
	Dec. 31, 2017
Building | Minimum
Property, equipment and software
Estimated useful life	30 years
Building | Maximum
Property, equipment and software
Estimated useful life	40 years
Website-related equipment
Property, equipment and software
Estimated useful life	5 years
Computer equipment | Minimum
Property, equipment and software
Estimated useful life	3 years
Computer equipment | Maximum
Property, equipment and software
Estimated useful life	5 years
Furniture and fixtures | Minimum
Property, equipment and software
Estimated useful life	3 years
Furniture and fixtures | Maximum
Property, equipment and software
Estimated useful life	5 years
Software | Minimum
Property, equipment and software
Estimated useful life	3 years
Software | Maximum
Property, equipment and software
Estimated useful life	5 years

X

- 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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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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X

- Details

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