Asset Impairment, Exit, and Restructuring Costs (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Asset Impairment Charges And Exit Costs [Line Items]
Asset impairment, exit, and restructuring costs	$ 11	$ 16
Asset Impairment Charges	9
Restructuring Charges		1
Equity Method Investment, Other than Temporary Impairment		12
Corporate, Non-Segment [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Restructuring Charges	$ 2	$ 3

Asset Impairment Charges And Exit Costs [Line Items]

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount of restructuring charges, remediation cost, and asset impairment loss.

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