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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Fair Value Measurements [Line Items] |  |  |  |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ (253) | $ (157) | $ (463) | $ (177) |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 422 | $ 280 | $ 804 | $ 491 |
Weighted Average [Member] | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Inventory Related Payables [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Basis | 13.50% |  | 13.50% |  | 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 | 17.50% |  | 17.50% |  | 28.20%

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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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