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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