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Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Noncash Investing and Financing Activities      
Increase in PP&E related to increase in asset retirement obligations $ 1,611cop_IncreaseInPpeRelatedToIncreaseInAssetRetirementObligations [1] $ 1,329cop_IncreaseInPpeRelatedToIncreaseInAssetRetirementObligations [1] $ 1,010cop_IncreaseInPpeRelatedToIncreaseInAssetRetirementObligations [1],[2]
Increase in PP&E and debt related to a capital lease asset and obligation (84)cop_IncreaseInPpeAndDebtRelatedToIncreaseInCapitalLease 906cop_IncreaseInPpeAndDebtRelatedToIncreaseInCapitalLease  
Cash payments      
Interest 669us-gaap_InterestPaidNet 566us-gaap_InterestPaidNet 724us-gaap_InterestPaidNet
Income taxes 4,203us-gaap_IncomeTaxesPaidNet 4,910us-gaap_IncomeTaxesPaidNet 8,100us-gaap_IncomeTaxesPaidNet [2]
Net Sales (Purchases) of Short-Term Investments      
Short-term investments purchased (876)us-gaap_PaymentsToAcquireShortTermInvestments (361)us-gaap_PaymentsToAcquireShortTermInvestments (497)us-gaap_PaymentsToAcquireShortTermInvestments
Short-term investments sold 1,129us-gaap_ProceedsFromSaleOfShortTermInvestments 98us-gaap_ProceedsFromSaleOfShortTermInvestments 1,094us-gaap_ProceedsFromSaleOfShortTermInvestments
Net Sales (Purchases) of Short-Term Investments 253cop_NetPurchasesSalesOfShortTermInvestments (263)cop_NetPurchasesSalesOfShortTermInvestments 597cop_NetPurchasesSalesOfShortTermInvestments
ARO increase related to UK tax law changes $ 68cop_IncreaseInPpeRelatedToIncreaseInAssetRetirementObligationsUkTax $ 212cop_IncreaseInPpeRelatedToIncreaseInAssetRetirementObligationsUkTax $ 152cop_IncreaseInPpeRelatedToIncreaseInAssetRetirementObligationsUkTax
[1]
*Includes $68 million, $212 million and $152 million in 2014, 2013 and 2012, respectively, primarily related to the impact of U.K. tax law changes on the deductibility of decommissioning costs.
[2]
**2012 has been revised to conform to current-year presentation to include only income tax payments related to continuing operations.