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Derivative Instruments - Gains and Losses on Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on derivatives | $ (33) | $ 0 | $ (33) | $ 0
Oil Collars and Calls | Net sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on derivatives | 75 | 0 | 75 | 0
Marketing Derivatives | Net sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on derivatives | 91 | 36 | (119) | 8
Interest Rate Swaps | Losses on interest rate swaps and warrants, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on derivatives | (45) | 0 | (45) | 0
Interest Rate Swaps | Losses on interest rate swaps and warrants, net | WES Midstream |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on derivatives | (8) | 0 | (8) | 0
Warrant | Losses on interest rate swaps and warrants, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on derivatives | $ 20 | $ 0 | $ 20 | $ 0

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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