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LONG-TERM DEPOSITS AND PREPAYMENTS (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
LONG-TERM DEPOSITS AND PREPAYMENTS
Deposits paid to airline suppliers		¥ 276,128,171	¥ 244,072,331
Prepayments for purchase of long lived assets		241,378,538	625,084,070
Deposits paid to hotel suppliers		74,723,795	126,728,198
Others		247,689,752	151,394,598
Total	$ 129,093,380	¥ 839,920,256	¥ 1,147,279,197

X

- Definition

Deposit Paid to Airline Suppliers

+ References

No definition available.

+ Details

Name:	ctrp_DepositPaidToAirlineSuppliers
Namespace Prefix:	ctrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Deposit paid to hotel suppliers.

+ References

No definition available.

+ Details

Name:	ctrp_DepositPaidToHotelSuppliers
Namespace Prefix:	ctrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Other Deposit Assets

+ References

No definition available.

+ Details

Name:	ctrp_OtherDepositAssets
Namespace Prefix:	ctrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The total of the carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year and amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	ctrp_PrepaidExpenseAndDepositsNoncurrent
Namespace Prefix:	ctrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Sum of the carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_PrepaidExpenseNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant