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Debt and Credit Agreements (Details 3) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 15, 2014 | Apr. 14, 2014
Debt |  |  |  |  |
Debt | $ 1,752,000,000 us-gaap_LongTermDebt | $ 1,147,000,000 us-gaap_LongTermDebt |  |  |
Revolving credit facility |  |  |  |  |
Debt |  |  |  |  |
Period to reduce outstanding debt in equal monthly installments to the adjusted credit line available | 6 months |  |  |  |
Line of credit | 1,400,000,000 cog_AvailableLineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |
Borrowing base |  |  |  | 3,100,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 2,300,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
Number of trailing quarters used to calculate annual coverage ratio | 12 months |  |  |  |
Annual coverage ratio, minimum | 2.8 cog_DebtInstrumentCovenantAnnualCoverageRatioMinimum / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |
Asset coverage ratio, minimum | 1.75 cog_DebtInstrumentCovenantAssetCoverageRatioMinimum / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |
Current ratio, minimum | 1.0 cog_DebtInstrumentCovenantCurrentRatioMinimum / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |
Debt | 140,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 460,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |
Availability under the credit facility | $ 1,300,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |
Weighted-average effective interest rates (as a percent) | 2.20%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 2.30%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 3.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |
Weighted-average interest rate (as a percent) | 2.40%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 2.00%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |
Revolving credit facility | Greater than |  |  |  |  |
Debt |  |  |  |  |
Percentage of the entity's total indebtedness to its borrowing base under the credit facility under the first level | 25.00%cog_LineOfCreditFacilityBasisSpreadIncreaseTotalIndebtednessPercentageOfBorrowingBaseLevelOne / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Percentage of the entity's total indebtedness to its borrowing base under the credit facility under the second level | 50.00%cog_LineOfCreditFacilityBasisSpreadIncreaseTotalIndebtednessPercentageOfBorrowingBaseLevelTwo / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Percentage of the entity's total indebtedness to its borrowing base under the credit facility under the third level | 75.00%cog_LineOfCreditFacilityBasisSpreadIncreaseTotalIndebtednessPercentageOfBorrowingBaseLevelThree / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Percentage of the entity's total indebtedness to its borrowing base under the credit facility under the fourth level | 90.00%cog_LineOfCreditFacilityBasisSpreadIncreaseTotalIndebtednessPercentageOfBorrowingBaseLevelFour / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Commitment fee percentage | 0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Revolving credit facility | Less than or equal to |  |  |  |  |
Debt |  |  |  |  |
Commitment fee percentage | 0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Revolving credit facility | Eurodollar Loans |  |  |  |  |
Debt |  |  |  |  |
Description of variable rate basis | Euro-Dollars (LIBOR) |  |  |  |
Revolving credit facility | ABR Loans |  |  |  |  |
Debt |  |  |  |  |
Description of variable rate basis | Alternate Base Rate (ABR) |  |  |  |
Revolving credit facility | Less than 25 percent | Eurodollar Loans |  |  |  |  |
Debt |  |  |  |  |
Margin (as a percent) | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentDebtPercentageAxis = cog_DebtInstrumentDebtPercentageLessThanTwentyFivePercentMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateEuroDollarsLIBORMember |  |  |  |
Revolving credit facility | Less than 25 percent | ABR Loans |  |  |  |  |
Debt |  |  |  |  |
Margin (as a percent) | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentDebtPercentageAxis = cog_DebtInstrumentDebtPercentageLessThanTwentyFivePercentMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateBasePrimeMember |  |  |  |
Revolving credit facility | Greater than equal to 25 percent but less than 50 percent | Eurodollar Loans |  |  |  |  |
Debt |  |  |  |  |
Margin (as a percent) | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentDebtPercentageAxis = cog_DebtInstrumentDebtPercentageGreaterThanOrEqualToTwentyFivePercentButLessThanFiftyPercentMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateEuroDollarsLIBORMember |  |  |  |
Revolving credit facility | Greater than equal to 25 percent but less than 50 percent | ABR Loans |  |  |  |  |
Debt |  |  |  |  |
Margin (as a percent) | 0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentDebtPercentageAxis = cog_DebtInstrumentDebtPercentageGreaterThanOrEqualToTwentyFivePercentButLessThanFiftyPercentMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateBasePrimeMember |  |  |  |
Revolving credit facility | Greater than equal to 50 percent but less than 75 percent | Eurodollar Loans |  |  |  |  |
Debt |  |  |  |  |
Margin (as a percent) | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentDebtPercentageAxis = cog_DebtInstrumentDebtPercentageGreaterThanOrEqualToFiftyPercentButLessThanSeventyFivePercentMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateEuroDollarsLIBORMember |  |  |  |
Revolving credit facility | Greater than equal to 50 percent but less than 75 percent | ABR Loans |  |  |  |  |
Debt |  |  |  |  |
Margin (as a percent) | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentDebtPercentageAxis = cog_DebtInstrumentDebtPercentageGreaterThanOrEqualToFiftyPercentButLessThanSeventyFivePercentMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateBasePrimeMember |  |  |  |
Revolving credit facility | Greater than equal to 75 percent but less than 90 percent | Eurodollar Loans |  |  |  |  |
Debt |  |  |  |  |
Margin (as a percent) | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentDebtPercentageAxis = cog_DebtInstrumentDebtPercentageGreaterThanOrEqualToSeventyFivePercentButLessThanNinetyPercentMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateEuroDollarsLIBORMember |  |  |  |
Revolving credit facility | Greater than equal to 75 percent but less than 90 percent | ABR Loans |  |  |  |  |
Debt |  |  |  |  |
Margin (as a percent) | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentDebtPercentageAxis = cog_DebtInstrumentDebtPercentageGreaterThanOrEqualToSeventyFivePercentButLessThanNinetyPercentMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateBasePrimeMember |  |  |  |
Revolving credit facility | Greater than and equal to 90 percent | Eurodollar Loans |  |  |  |  |
Debt |  |  |  |  |
Margin (as a percent) | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentDebtPercentageAxis = cog_DebtInstrumentDebtPercentageGreaterThanOrEqualToNinetyPercentMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateEuroDollarsLIBORMember |  |  |  |
Revolving credit facility | Greater than and equal to 90 percent | ABR Loans |  |  |  |  |
Debt |  |  |  |  |
Margin (as a percent) | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / cog_DebtInstrumentDebtPercentageAxis = cog_DebtInstrumentDebtPercentageGreaterThanOrEqualToNinetyPercentMember / us-gaap_VariableRateAxis = cog_DebtInstrumentVariableRateBasePrimeMember |  |  |  |

X
- Definition Represents the available line of credit. + References No definition available. + Details
Name: | cog_AvailableLineOfCredit
Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Covenant, Annual Coverage Ratio, Minimum + References No definition available. + Details
Name: | cog_DebtInstrumentCovenantAnnualCoverageRatioMinimum
Namespace Prefix: | cog_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Covenant, Asset Coverage Ratio, Minimum + References No definition available. + Details
Name: | cog_DebtInstrumentCovenantAssetCoverageRatioMinimum
Namespace Prefix: | cog_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the ratio of current assets to current liabilities. + References No definition available. + Details
Name: | cog_DebtInstrumentCovenantCurrentRatioMinimum
Namespace Prefix: | cog_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of trailing quarters used to calculate the annual coverage ratio. + References No definition available. + Details
Name: | cog_DebtInstrumentCovenantNumberofTrailingQuartersforCalculationofAnnualCoverageRatio
Namespace Prefix: | cog_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of the entity's total indebtedness to its borrowing base under the credit facility under the fourth level. + References No definition available. + Details
Name: | cog_LineOfCreditFacilityBasisSpreadIncreaseTotalIndebtednessPercentageOfBorrowingBaseLevelFour
Namespace Prefix: | cog_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of the entity's total indebtedness to its borrowing base under the credit facility under the first level. + References No definition available. + Details
Name: | cog_LineOfCreditFacilityBasisSpreadIncreaseTotalIndebtednessPercentageOfBorrowingBaseLevelOne
Namespace Prefix: | cog_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of the entity's total indebtedness to its borrowing base under the credit facility under the third level. + References No definition available. + Details
Name: | cog_LineOfCreditFacilityBasisSpreadIncreaseTotalIndebtednessPercentageOfBorrowingBaseLevelThree
Namespace Prefix: | cog_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of the entity's total indebtedness to its borrowing base under the credit facility under the second level. + References No definition available. + Details
Name: | cog_LineOfCreditFacilityBasisSpreadIncreaseTotalIndebtednessPercentageOfBorrowingBaseLevelTwo
Namespace Prefix: | cog_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the period over which the entity has to reduce its outstanding borrowings in the event that the adjusted credit line available is less than outstanding borrowings. + References No definition available. + Details
Name: | cog_LineOfCreditFacilityPeriodToReduceOutstandingDebtInEqualMonthlyInstallmentsToTheAdjustedCreditLineAvailable
Namespace Prefix: | cog_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The effective interest rate during the reporting period. + 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_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Weighted average interest rate of long-term debt outstanding. + References No definition available. + Details
Name: | us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |