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Fair Value Measurements Changes in Fair Value Level 3 (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Nonrecurring [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |  |  |
Impairment of property, plant and equipment | $ 1 | $ 3 |  |
Recurring measurement | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |  |  |
Fair value of assets measured at fair value on a recurring basis | 3 | 368 | $ 372 | $ 278
Net gains recognized in income | 89 | 91 |  |
Sales | (458) | 0 |  |
Other | $ 0 | $ (1) |  |

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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