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Derivatives - Marketing Derivatives and Warrants (Details) $ / shares in Units, shares in Millions, $ in Millions | 6 Months Ended | 12 Months Ended |  |  |
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Jun. 30, 2020 | Jun. 30, 2020 $ / Barrel | Jun. 30, 2020 $ / MillionCubicFeet | Jun. 30, 2020 MMBbls | Jun. 30, 2020 Bcf | Dec. 31, 2019 $ / Barrel | Dec. 31, 2019 $ / MillionCubicFeet | Dec. 31, 2019 MMBbls | Dec. 31, 2019 Bcf | Jun. 26, 2020 $ / shares shares | May 29, 2020 USD ($) | Aug. 08, 2019 $ / shares shares
Marketing Derivatives |  |  |  |  |  |  |  |  |  |  |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |
Derivative instrument settlement period (within) | 3 months |  |  |  |  |  |  |  |  |  |  |
Marketing Derivatives | Not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |
Weighted average sales price (dollars per barrel) |  | 36.24 | 1.55 |  |  | 60.60 | 2.17 |  |  |  |  |
Crude oil | Not designated as hedging instruments | Long position |  |  |  |  |  |  |  |  |  |  |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |
Outstanding net volumes on derivatives not designated as hedges (mmbls/bcf) |  |  |  | 28 | (131) |  |  | 55 | (128) |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) | shares |  |  |  |  |  |  |  |  |  | 3.9 |  |
Exercise price of warrant (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 59.624 |  |
Additional Paid-in Capital | Reclassification |  |  |  |  |  |  |  |  |  |  |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrant, reclassification | $ |  |  |  |  |  |  |  |  |  |  | $ 102 |
Anadarko | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 80.0
Exercise price of warrant (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 62.50

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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 Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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