XML 78 R66.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Derivative and Financial Instruments - FX Notional (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Sell US Dollar Buy Other Currencies [Member] |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |
Net notional position of foreign currency exchange derivatives | $ 1,258 | [1] | $ 0
Sell British pound, buy other currencies [Member] |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |
Net notional position of foreign currency exchange derivatives | 23 |  | 1
Sell Canadian dollar, buy U.S. dollar [Member] |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |
Net notional position of foreign currency exchange derivatives | $ 1,230 |  | $ 1,225
[1] | (1)Primarily British pound.

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_TradingActivityGainsAndLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cop_SellUsDollarBuyOtherCurrenciesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cop_SellBritishPoundBuyOtherCurrenciesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cop_SellCanadianDollarBuyUSDollarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |