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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Aug. 26, 2020 | Dec. 31, 2019
Fair Value Measurements [Line Items] |  |  |  |  |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ (635) | $ (81) | $ (1,100) | $ (258) |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 392 | $ 165 | $ 1,200 | $ 656 |  |
Weighted Average [Member] | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Inventory Related Payables [Member] |  |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |  |
Basis | 56.40% |  | 56.40% |  |  | 14.70%
Weighted Average [Member] | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Inventories Carried At Market [Member] |  |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |  |
Basis | 20.60% |  | 20.60% |  |  | 28.20%
Bonds Zero Percent Due in 2023 [Member] |  |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 300 |

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