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Employee Benefit Plans U.S and International Subsidiary Savings Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. savings plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost	$ 21	$ 19	$ 22
International subsidiary savings plans
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost	$ 17	$ 16	$ 18

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Details

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