v2.4.0.8

Derivative and Financial Instruments - Commodity Notional (Details 2) | Jun. 30, 2013 ft3 | Dec. 31, 2012 ft3
--- | --- | ---
Natural gas and power, Fixed price [Member] |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |
Commodity derivatives - volumetric material net exposures | (31,000,000,000) | (48,000,000,000)
Natural gas and power, Basis [Member] |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |
Commodity derivatives - volumetric material net exposures | (29,000,000,000) | 125,000,000,000

X
- Definition Aggregate notional amount of price risk derivatives not designated as a hedging instrument with notional amounts expressed in nonmonetary units. For example the number of barrels specified in a fuel oil forward purchase contract - volume only, not $/unit + References No definition available. + Details
Name: | cop_NonmonetaryNotionalAmountOfPriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsVolume
Namespace Prefix: | cop_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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