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Capital Stock (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 31, 2014 | May 30, 2014 | May 01, 2014
Incentive Plans |  |  |  |  |  |
Common stock, Authorized shares | 960,000,000 us-gaap_CommonStockSharesAuthorized | 480,000,000 us-gaap_CommonStockSharesAuthorized |  | 960,000,000 us-gaap_CommonStockSharesAuthorized | 480,000,000 us-gaap_CommonStockSharesAuthorized |
Treasury stock |  |  |  |  |  |
Number of shares repurchased | 4,300,000 us-gaap_TreasuryStockSharesAcquired | 4,800,000 us-gaap_TreasuryStockSharesAcquired | 0 us-gaap_TreasuryStockSharesAcquired |  |  |
Cost of shares repurchased | $ 138,852,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 164,634,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 0 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |
Cumulative number of shares repurchased under a share repurchase program | 29,900,000 cog_CumulativeTreasuryStockSharesAcquired |  |  |  |  |
Treasury stock, number of shares authorized to be repurchased | 40,000,000.0 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |  |  |  |
Treasury stock, cumulative shares retired | 20,000,000 cog_CumulativeTreasuryStockSharesRetired |  |  |  |  |
Cumulative cost of shares repurchased under a share repurchase program | $ 388,400,000 cog_CumulativePaymentsForRepurchaseOfCommonStock |  |  |  |  |
Treasury stock reissued | 0 us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued |  |  |  |  |
Shares held as treasury stock | 9,892,680 us-gaap_TreasuryStockShares | 5,618,166 us-gaap_TreasuryStockShares |  |  |  |
2014 Incentive Plan |  |  |  |  |  |
Incentive Plans |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  | 18,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = cog_StockIncentivePlan2014Member
Number of shares available for issuance | 18,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = cog_StockIncentivePlan2014Member |  |  |  |  |
2014 Incentive Plan | Stock options | Less than or equal to |  |  |  |  |  |
Incentive Plans |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  | 10,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = cog_StockIncentivePlan2014Member / us-gaap_RangeAxis = us-gaap_MaximumMember

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