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Fair Value Measurements (Narrative) (Details) - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Fair Value Measurements [Line Items] |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 1,700 | $ 900
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 1,800 | $ 7
Assets [Member] | Weighted Average [Member] | Fair Value, Recurring [Member] | Inventories Component [Member] |  |
Fair Value Measurements [Line Items] |  |
Basis | 4.30% | 28.20%
Liabilities [Member] | Weighted Average [Member] | Fair Value, Recurring [Member] | Inventories Component [Member] |  |
Fair Value Measurements [Line Items] |  |
Basis | 13.70% | 14.70%

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- Definition Fair Value Measurements [Line Items] + References No definition available. + Details
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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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- Definition Amount of unrealized gain (loss) recognized in income from liability 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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