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Derivatives - Not Designated as Hedging Instruments (Details) $ in Millions | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 USD ($) $ / MillionCubicFeet $ / Barrel Bcf MMBbls | Dec. 31, 2017 USD ($) $ / MillionCubicFeet $ / Barrel Bcf MMBbls
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Derivative instrument settlement period (within) | 3 months |
Not designated as hedging instruments | Crude oil |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Weighted average sales price | $ / Barrel | 69.98 | 57.38
Not designated as hedging instruments | Crude oil | Net sales |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Unrealized gain (loss) on derivatives not designated as hedges | $ (37) | $ (47)
Not designated as hedging instruments | Natural gas |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Weighted average sales price | $ / MillionCubicFeet | 2.67 | 2.73
Not designated as hedging instruments | Natural gas | Net sales |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Unrealized gain (loss) on derivatives not designated as hedges | $ (1) | $ 1
Not designated as hedging instruments | Long position | Crude oil |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Outstanding net volumes on derivatives not designated as hedges (mmbls/bcf) | MMBbls | 73 | 61
Not designated as hedging instruments | Short position | Natural gas |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Outstanding net volumes on derivatives not designated as hedges (mmbls/bcf) | Bcf | 88 | 47

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- Definition The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- 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
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- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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