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Derivative Instruments - Marketing Derivatives and Warrants (Details) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended |
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Sep. 30, 2019 | Sep. 30, 2019 Bcf | Sep. 30, 2019 MMBbls | Sep. 30, 2019 $ / MillionCubicFeet | Sep. 30, 2019 $ / Barrel | Dec. 31, 2018 Bcf | Dec. 31, 2018 MMBbls | Dec. 31, 2018 $ / MillionCubicFeet | Dec. 31, 2018 $ / Barrel | Aug. 08, 2019 USD ($) $ / 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) |  |  |  | 2.22 | 58.39 |  |  | 3.18 | 58.81 |
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) | MMBbls |  |  | 36 |  |  |  | 61 |  |  |
Natural gas | Not designated as hedging instruments | Short position |  |  |  |  |  |  |  |  |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |  |  |  |  |  |  |  |  |
Outstanding net volumes on derivatives not designated as hedges (mmbls/bcf) | Bcf |  | 128 |  |  |  | 142 |  |  |  |
Warrant |  |  |  |  |  |  |  |  |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |  |  |  |  |  |  |  |  |
Initial fair value of warrant | $ |  |  |  |  |  |  |  |  |  | $ 188
Anadarko | Common Stock |  |  |  |  |  |  |  |  |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |  |  |  |  |  |  |  |  |
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 Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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