XML 63 R48.htm IDEA: XBRL DOCUMENT v3.6.0.2

Equity Method Investments - Narrative (Details)	1 Months Ended		12 Months Ended
	Feb. 28, 2014 mi	Apr. 30, 2012 USD ($) mi	Dec. 31, 2016 USD ($) investment
Schedule of Equity Method Investments [Line Items]
Number of investments | investment			2
Transcontinental Gas Pipe Line Company LLC
Schedule of Equity Method Investments [Line Items]
Entity's equity interest in construction agreement (as a percent)	61.00%
Constitution Pipeline Company, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)		25.00%
Length of pipeline to be constructed (in miles) | mi		124
Contribution cap		$ 250,000,000
Meade Pipeline Co LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	20.00%
Length of pipeline to be constructed (in miles) | mi	177
Expected contribution in future years			$ 120,300,000
Number of year's investment expected for contribution			3 years
Entity's equity interest in construction agreement (as a percent)	39.00%
Equity Method Investment Commitment [Member] | Constitution Pipeline Company, LLC
Schedule of Equity Method Investments [Line Items]
Expected contribution in future years			$ 148,900,000
Number of year's investment expected for contribution			3 years
Anticipated contributions			$ 240,000,000
Contributions to date			$ 88,500,000

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:	num:lengthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Equity Method Investment, Contributions to Date

+ References

No definition available.

+ Details

Name:	cog_EquityMethodInvestmentContributionstoDate
Namespace Prefix:	cog_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Equity Method Investments, Number of Investments

+ References

No definition available.

+ Details

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

X

- Definition

Represents the contribution cap of investment.

+ References

No definition available.

+ Details

Name:	cog_JointlyOwnedPipelineNetOwnershipContributionCap
Namespace Prefix:	cog_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of expected contribution to be made by the entity for fund cost associated with the jointly owned pipeline in future years.

+ References

No definition available.

+ Details

Name:	cog_JointlyOwnedPipelineNetOwnershipExpectedContribution
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 for contribution.

+ References

No definition available.

+ Details

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

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=66011266&loc=d3e33918-111571

+ Details

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

X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	dei_LegalEntityAxis=cog_TranscontinentalGasPipeLineCompanyLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cog_ConstitutionPipelineCompanyLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cog_MeadePipelineCoLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=cog_EquityMethodInvestmentCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: