This element represents the Dutch statutory income tax rate in 2011.

No definition available.

Name:	pcln_DutchStatutoryIncomeTaxRate2011
Namespace Prefix:	pcln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the effective income tax rate on qualifying innovative activities under Innovative Box Tax.

+ References

No definition available.

+ Details

Name:	pcln_EffectiveIncomeTaxRateAtInnovationBoxTaxRate
Namespace Prefix:	pcln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The total estimated aggregate NOL, net of limitation, imposed by Section 382 related to the use of all operating loss carryforwards available to reduce future taxable income in the event of a more than 50 percent change in ownership.

+ References

No definition available.

+ Details

Name:	pcln_OperatingLossCarryforwardsLimitationsOnUseEstimatedFutureAggregateLimitationRelatingToSection382
Namespace Prefix:	pcln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

+ Details

Name:	us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

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

- Definition

Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_OperatingLossCarryforwardsExpirationDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

INCOME TAXES INCOME TAXES (Details) (USD $) In Billions, unless otherwise specified	9 Months Ended				9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013 Internal Revenue Service (IRS) [Member]	Dec. 31, 2013 Internal Revenue Service (IRS) [Member] Operating losses [Member]	Dec. 31, 2013 Internal Revenue Service (IRS) [Member] Equity-related transactions [Member]	Sep. 30, 2014 Internal Revenue Service (IRS) [Member] Operating losses [Member] Minimum [Member]	Sep. 30, 2014 Internal Revenue Service (IRS) [Member] Operating losses [Member] Maximum [Member]
Income Tax Contingency [Line Items]
U.S. statutory federal rate	35.00%
Effective income tax rate on qualifying innovative activities at Innovation Box tax rate	5.00%
Dutch statutory rate	25.00%
Estimated aggregate limitation of cumulative net operating losses available net of limit imposed by IRC Section 382		$ 1.4
Net operating loss carryforwards			$ 0.3	$ 1.1
Operating loss carryforwards, expiration date					Dec. 31, 2019	Dec. 31, 2021