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EMPLOYEE BENEFITS (Details) - CNY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
EMPLOYEE BENEFITS |  |  |
Expense of employee benefits | ¥ 1,600 | ¥ 1,400 | ¥ 961

X
- Definition The amount of expense related to government sponsored employee benefits during the period. + References No definition available. + Details
Name: | ctrp_ExpenseOfEmployeeBenefits
Namespace Prefix: | ctrp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration