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Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012 Qualified pension plan	Dec. 31, 2011 Non-qualified pension plans	Dec. 31, 2012 Postretirement Benefits Other than Pensions
Cash flows
Employer's contribution in current year	$ 11.3	$ 5.6
Employer's expected contribution in following year			$ 1.3

X

- Definition

The contributions paid to the plan during the current year. Contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

+ References

No definition available.

+ Details

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

X

- Definition

The expected contributions paid in the following year. Contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

+ References

No definition available.

+ Details

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

X

- Details

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