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Debt and Credit Agreements (Details 3) (Revolving credit facility, USD $) | 0 Months Ended |  |
--- | --- | --- | ---
Apr. 17, 2015 | Mar. 31, 2015 | Apr. 16, 2015
Debt Instrument [Line Items] |  |  |
Availability under the credit facility |  | $ 1,100,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |
Subsequent event |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing base | 3,400,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  | 3,100,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Availability under the credit facility | 1,800,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  | 1,400,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent event | Accordion Feature, Amended Facility |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing base | 500,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_DebtInstrumentAxis = cog_AccordionFeatureAmendedFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Minimum | Subsequent event |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee on the unused available balance | 0.30%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Maximum | Subsequent event |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee on the unused available balance | 0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Eurodollar LIBOR | Subsequent event |  |  |
Debt Instrument [Line Items] |  |  |
Description of variable rate basis | Eurodollar (LIBOR) |  |
Alternate base rate (ABR) | Subsequent event |  |  |
Debt Instrument [Line Items] |  |  |
Description of variable rate basis | alternate base rate (ABR) |  |
Debt Instrument Leverage Ratio Less than 1.0x | Eurodollar LIBOR | Subsequent event |  |  |
Interest Rates Under Amended Credit Facility |  |  |
Basis spread on variable rate | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentLeverageRatioAxis = cog_DebtInstrumentLeverageRatioLessThan1.0xMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateEuroDollarsLIBORMember |  |
Debt Instrument Leverage Ratio Less than 1.0x | Alternate base rate (ABR) | Subsequent event |  |  |
Interest Rates Under Amended Credit Facility |  |  |
Basis spread on variable rate | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentLeverageRatioAxis = cog_DebtInstrumentLeverageRatioLessThan1.0xMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = cog_AlternateBaseRateMember |  |
Debt Instrument Leverage Ratio Greater than or Equal to 1.0x but Less than 2.0x | Eurodollar LIBOR | Subsequent event |  |  |
Interest Rates Under Amended Credit Facility |  |  |
Basis spread on variable rate | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentLeverageRatioAxis = cog_DebtInstrumentDebtLeverageRatioGreaterThanOrEqualTo1.0xButLessThan2.0xMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateEuroDollarsLIBORMember |  |
Debt Instrument Leverage Ratio Greater than or Equal to 1.0x but Less than 2.0x | Alternate base rate (ABR) | Subsequent event |  |  |
Interest Rates Under Amended Credit Facility |  |  |
Basis spread on variable rate | 0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentLeverageRatioAxis = cog_DebtInstrumentDebtLeverageRatioGreaterThanOrEqualTo1.0xButLessThan2.0xMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = cog_AlternateBaseRateMember |  |
Debt Instrument Leverage Ratio Greater than or Equal to 2.0x but Less 3.0x | Eurodollar LIBOR | Subsequent event |  |  |
Interest Rates Under Amended Credit Facility |  |  |
Basis spread on variable rate | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentLeverageRatioAxis = cog_DebtInstrumentLeverageRatioGreaterThanOrEqualTo2.0xButLessThan3.0xMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateEuroDollarsLIBORMember |  |
Debt Instrument Leverage Ratio Greater than or Equal to 2.0x but Less 3.0x | Alternate base rate (ABR) | Subsequent event |  |  |
Interest Rates Under Amended Credit Facility |  |  |
Basis spread on variable rate | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentLeverageRatioAxis = cog_DebtInstrumentLeverageRatioGreaterThanOrEqualTo2.0xButLessThan3.0xMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = cog_AlternateBaseRateMember |  |
Debt Instrument Leverage Ratio Greater than or Equal to 3.0x | Eurodollar LIBOR | Subsequent event |  |  |
Interest Rates Under Amended Credit Facility |  |  |
Basis spread on variable rate | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentLeverageRatioAxis = cog_DebtInstrumentLeverageRatioGreaterThanOrEqualTo3.0xMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateEuroDollarsLIBORMember |  |
Debt Instrument Leverage Ratio Greater than or Equal to 3.0x | Alternate base rate (ABR) | Subsequent event |  |  |
Interest Rates Under Amended Credit Facility |  |  |
Basis spread on variable rate | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentLeverageRatioAxis = cog_DebtInstrumentLeverageRatioGreaterThanOrEqualTo3.0xMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = cog_AlternateBaseRateMember |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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