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Fair Value Measurements Changes in Fair Value Level 3 (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |  |  |  |  |
Impairment of property, plant and equipment | $ 1 | $ 3 | $ 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 | $ 333 | 3 | 333 | $ 372 | $ 278
Net gains recognized in income |  |  | 89 | 55 |  |
Sales |  |  | $ (458) | $ 0 |  |

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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