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Derivatives - Not Designated as Hedging Instruments (Details) $ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 USD ($) $ / MillionCubicFeet $ / Barrel Bcf MMBbls | Dec. 31, 2018 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 (dollars per barrel) | $ / Barrel | 61.46 | 58.81
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 | $ (24) | $ 184
Not designated as hedging instruments | Natural gas |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Weighted average sales price (dollars per barrel) | $ / MillionCubicFeet | 2.11 | 3.18
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 | $ 5 | $ 5
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 | 54 | 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 | 155 | 142

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- Definition Sales price per unit of oil and gas produced. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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