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Debt and Credit Agreements (Details 2) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 31, 2001
Investor
Tranche
Jul. 31, 2008
Tranche
Investor
Dec. 31, 2008
Investor
Dec. 31, 2010
Investor
Tranche
Sep. 30, 2014
Tranche
Investor
Debt                
Repayments of debt $ 1,427,000,000us-gaap_RepaymentsOfLongTermDebt $ 895,000,000us-gaap_RepaymentsOfLongTermDebt $ 263,000,000us-gaap_RepaymentsOfLongTermDebt          
7.33% weighted-average fixed rate notes                
Debt                
Asset coverage ratio, minimum 1.75cog_DebtInstrumentCovenantAssetCoverageRatioMinimum
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
             
Number of trailing quarters used to calculate annual coverage ratio 12 months              
Annual coverage ratio, minimum 2.8cog_DebtInstrumentCovenantAnnualCoverageRatioMinimum
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
             
Weighted-average interest rate (as a percent) 7.33%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
7.33%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
           
Principal       170,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
       
Number of institutional investors that purchased debt in a private placement offering       7cog_DebtInstrumentNumberOfInstitutionalInvestors
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
       
Number of tranches       3cog_LongTermDebtNumberOfTranches
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
       
Repayments of debt 150,000,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
             
7.33% weighted-average fixed rate notes | 7.33% Weighted-Average Fixed Rate Notes Tranche 1 due July 2011                
Debt                
Principal       75,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheOneSevenPointThreeThreePercentageMember
       
Term       10 years        
Coupon (as a percent)       7.26%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheOneSevenPointThreeThreePercentageMember
       
7.33% weighted-average fixed rate notes | 7.33% Weighted-Average Fixed Rate Notes Tranche 2 due July 2013                
Debt                
Principal       75,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheTwoSevenPointThreeThreePercentageMember
       
Term       12 years        
Coupon (as a percent)       7.36%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheTwoSevenPointThreeThreePercentageMember
       
7.33% weighted-average fixed rate notes | 7.33% Weighted-Average Fixed Rate Notes Tranche 3 due July 2016                
Debt                
Principal       20,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheThreeSevenPointThreeThreePercentageMember
       
Term       15 years        
Coupon (as a percent)       7.46%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_SevenPointThreeThreePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheThreeSevenPointThreeThreePercentageMember
       
6.51% weighted-average fixed rate notes                
Debt                
Weighted-average interest rate (as a percent) 6.51%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember
6.51%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember
           
Principal         425,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember
     
Number of institutional investors that purchased debt in a private placement offering         41cog_DebtInstrumentNumberOfInstitutionalInvestors
/ us-gaap_DebtInstrumentAxis
= cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember
     
Number of tranches         3cog_LongTermDebtNumberOfTranches
/ us-gaap_DebtInstrumentAxis
= cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember
     
6.51% weighted-average fixed rate notes | 6.51% Weighted-Average Fixed Rate Notes Tranche 1 due July 2018                
Debt                
Principal         245,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheOneSixPointFiveOnePercentageMember
     
Term         10 years      
Coupon (as a percent)         6.44%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheOneSixPointFiveOnePercentageMember
     
6.51% weighted-average fixed rate notes | 6.51% Weighted-Average Fixed Rate Notes Tranche 2 due July 2020                
Debt                
Principal         100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheTwoSixPointFiveOnePercentageMember
     
Term         12 years      
Coupon (as a percent)         6.54%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheTwoSixPointFiveOnePercentageMember
     
6.51% weighted-average fixed rate notes | 6.51% Weighted-Average Fixed Rate Notes Tranche 3 due July 2023                
Debt                
Principal         80,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheThreeSixPointFiveOnePercentageMember
     
Term         15 years      
Coupon (as a percent)         6.69%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheThreeSixPointFiveOnePercentageMember
     
9.78% fixed rate notes                
Debt                
Principal           67,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_NinePointSevenEightPercentageNotesMember
   
Number of institutional investors that purchased debt in a private placement offering           4cog_DebtInstrumentNumberOfInstitutionalInvestors
/ us-gaap_DebtInstrumentAxis
= cog_NinePointSevenEightPercentageNotesMember
   
Term           10 years    
Coupon (as a percent) 9.78%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_NinePointSevenEightPercentageNotesMember
9.78%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_NinePointSevenEightPercentageNotesMember
      9.78%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_NinePointSevenEightPercentageNotesMember
   
5.58% weighted-average fixed rate notes                
Debt                
Weighted-average interest rate (as a percent) 5.58%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember
5.58%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember
           
Principal             175,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember
 
Number of institutional investors that purchased debt in a private placement offering             8cog_DebtInstrumentNumberOfInstitutionalInvestors
/ us-gaap_DebtInstrumentAxis
= cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember
 
Number of tranches             3cog_LongTermDebtNumberOfTranches
/ us-gaap_DebtInstrumentAxis
= cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember
 
5.58% weighted-average fixed rate notes | 5.58% Weighted-Average Fixed Rate Notes Tranche 1 due January 2021                
Debt                
Principal             88,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheOneFivePointFiveEightPercentageMember
 
Term             10 years  
Coupon (as a percent)             5.42%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheOneFivePointFiveEightPercentageMember
 
5.58% weighted-average fixed rate notes | 5.58% Weighted-Average Fixed Rate Notes Tranche 2 due January 2023                
Debt                
Principal             25,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheTwoFivePointFiveEightPercentageMember
 
Term             12 years  
Coupon (as a percent)             5.59%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheTwoFivePointFiveEightPercentageMember
 
5.58% weighted-average fixed rate notes | 5.58% Weighted-Average Fixed Rate Notes Tranche 3 due January 2026                
Debt                
Principal             62,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheThreeFivePointFiveEightPercentageMember
 
Term             15 years  
Coupon (as a percent)             5.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_TrancheThreeFivePointFiveEightPercentageMember
 
Revolving credit facility                
Debt                
Asset coverage ratio, minimum 1.75cog_DebtInstrumentCovenantAssetCoverageRatioMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
             
Number of trailing quarters used to calculate annual coverage ratio 12 months              
Annual coverage ratio, minimum 2.8cog_DebtInstrumentCovenantAnnualCoverageRatioMinimum
/ 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
           
Senior Notes | 3.65% weighted-average fixed rate notes                
Debt                
Weighted-average interest rate (as a percent)               3.65%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= cog_ThreePointSixFivePercentageWeightedAverageFixedRateNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Principal               925,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_ThreePointSixFivePercentageWeightedAverageFixedRateNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Number of institutional investors that purchased debt in a private placement offering               24cog_DebtInstrumentNumberOfInstitutionalInvestors
/ us-gaap_DebtInstrumentAxis
= cog_ThreePointSixFivePercentageWeightedAverageFixedRateNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Number of tranches               3cog_LongTermDebtNumberOfTranches
/ us-gaap_DebtInstrumentAxis
= cog_ThreePointSixFivePercentageWeightedAverageFixedRateNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt issuance costs               5,600,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= cog_ThreePointSixFivePercentageWeightedAverageFixedRateNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes | 3.65% weighted-average fixed rate notes | 3.65% Weighted-Average Fixed Rate Notes Tranche 1 due September 2021                
Debt                
Principal               100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_ThreePointSixFivePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_SeniorNotesTranche1DueSeptember2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Term               7 years
Coupon (as a percent)               3.24%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_ThreePointSixFivePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_SeniorNotesTranche1DueSeptember2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes | 3.65% weighted-average fixed rate notes | 3.65% Weighted-Average Fixed Rate Notes Tranche 2 due September 2024                
Debt                
Principal               575,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_ThreePointSixFivePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_SeniorNotesTranche2DueSeptember2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Term               10 years
Coupon (as a percent)               3.67%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_ThreePointSixFivePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_SeniorNotesTranche2DueSeptember2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes | 3.65% weighted-average fixed rate notes | 3.65% Weighted-Average Fixed Rate Notes Tranche 3 due September 2026                
Debt                
Principal               $ 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cog_ThreePointSixFivePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_SeniorNotesTranche3DueSeptember2026Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Term               12 years
Coupon (as a percent)               3.77%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cog_ThreePointSixFivePercentageWeightedAverageFixedRateNotesMember
/ cog_DebtInstrumentTranchesAxis
= cog_SeniorNotesTranche3DueSeptember2026Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember