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Derivatives - Gains and Losses on Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Losses on interest rate swaps and Berkshire warrants, net | $ (76) | $ 0 | $ (661) | $ 0
Oil Collars and Calls | Net sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Losses on interest rate swaps and Berkshire warrants, net | 5 | 0 | 957 | 0
Marketing Derivatives | Net sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Losses on interest rate swaps and Berkshire warrants, net | (392) | 683 | 18 | 1,248
Interest Rate Swaps | Gains (losses) on interest rate swaps and warrants, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Losses on interest rate swaps and Berkshire warrants, net | 3 | 0 | (666) | 0
Warrant | Gains (losses) on interest rate swaps and warrants, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Losses on interest rate swaps and Berkshire warrants, net | $ (79) | $ 0 | $ 5 | $ 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=121590274&loc=SL5618551-113959 + Details
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