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PRINCIPAL ACCOUNTING POLICIES (Details 9)	1 Months Ended
	Jan. 31, 2012 shares
PRINCIPAL ACCOUNTING POLICIES
Number of shares, converted to RSU in January 2012	(1,901,372)

X

- Definition

Represents the number of share options (or share units) converted during the current period.

+ References

No definition available.

+ Details

Name:	ctrp_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsConvertedInPeriod
Namespace Prefix:	ctrp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration