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Investments in Affiliates (Summarized Income Statement Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment In Affiliates [Abstract]
Revenues	$ 1,358	$ 1,164	$ 1,385
Operating Income	407	714	800
Net income	$ 145	$ 384	$ 470

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- Definition

Investment In Affiliates [Abstract]

+ References

No definition available.

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Amount of income (loss) from continuing operations reported by an equity method investee.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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- Definition

The amount of net income (loss) reported by an equity method investment of the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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