Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Investments in and Advances to Affiliates [Line Items]
Revenue	$ 2,650	$ 2,740
Operating margin	586	656
Income (Loss) from Equity Method Investments	(6)	11
Minority Owned Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Revenue	214	206
Operating margin	11	28
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ (21)	$ 12

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount after income tax of income (loss) including the portion attributable to nonredeemable noncontrolling interest. Excludes the portion attributable to redeemable noncontrolling interest recognized as temporary equity.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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