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DERIVATIVES - GAINS AND LOSSES ON DERIVATIVES (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative instruments | $ 233 | $ 0 | $ 0
Oil Collars and Calls | Net sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative instruments | (107) | 0 | 0
Marketing Derivatives | Net sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative instruments | 1,804 | 2,254 | (138)
Interest Rate Swaps | Gain (Loss) on Interest Rate Swaps and Warrants, Net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative instruments | 122 | 0 | 0
Interest Rate Swaps | Gain (Loss) on Interest Rate Swaps and Warrants, Net | WES |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative instruments | 30 | 0 | 0
Warrant | Gain (Loss) on Interest Rate Swaps and Warrants, Net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative instruments | $ 81 | $ 0 | $ 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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