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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, 2017 | Dec. 31, 2016
Fair Value Measurements [Line Items] |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | $ 106 | $ 138
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) | $ 260 | $ (578)
Assets [Member] | Weighted Average [Member] | Fair Value, Measurements, Recurring [Member] | Inventories Component [Member] |  |
Fair Value Measurements [Line Items] |  |
Basis | 12.80% | 16.50%
Liabilities [Member] | Weighted Average [Member] | Fair Value, Measurements, Recurring [Member] | Inventories Component [Member] |  |
Fair Value Measurements [Line Items] |  |
Basis | 99.90% | 67.10%

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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