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Equity Method Investments (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Feb. 28, 2014
Equity Method Investment
Ownership interest (as a percent)		20.00%
Amount of investment		$ 149
Contributions	$ 1.2
Central Pipleline
Equity Method Investment
Length of pipeline to be constructed (in miles)	177
Transco | Central Pipleline
Equity Method Investment
Proportionate ownership interest (as a percent)		61.00%
Meade Pipeline Co LLC | Central Pipleline
Equity Method Investment
Proportionate ownership interest (as a percent)		39.00%
Minimum
Equity Method Investment
Number of years of investment expected to occur	3 years
Maximum
Equity Method Investment
Number of years of investment expected to occur	4 years

X

- Definition

Represents the length of pipeline to be constructed under the development and construction agreement.

+ References

No definition available.

+ Details

Name:	cog_DevelopmentAndConstructionAgreementLengthOfPipelineToBeConstructed
Namespace Prefix:	cog_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the contributions to fund the cost associated with the project for the period.

+ References

No definition available.

+ Details

Name:	cog_JointlyOwnedPipelineNetOwnershipContributions
Namespace Prefix:	cog_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The proportionate share of interest (percent) in a jointly owned pipeline.

+ References

No definition available.

+ Details

Name:	cog_JointlyOwnedPipelineProportionateOwnershipShare
Namespace Prefix:	cog_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the period for which the investment is expected to occur.

+ References

No definition available.

+ Details

Name:	cog_NumbersOfYearsInvestmentExpectedToOccur
Namespace Prefix:	cog_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ 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 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 12

-Article 5

+ Details

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

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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