PRINCIPAL ACCOUNTING POLICIES - LEASEHOLD LAND PAYMENTS (Details)	12 Months Ended
Dec. 31, 2018
Minimum [member]
Disclosure of maturity analysis of operating lease payments [line items]
Lease terms	36 years 6 months
Maximum [member]
Disclosure of maturity analysis of operating lease payments [line items]
Lease terms	50 years

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

No definition available.

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