Segment, Geographic and Other Revenue Information - Segment Information (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($) country region	Dec. 31, 2015 USD ($) country	Dec. 31, 2014
Segment Reporting Information [Line Items]
Number of regional segments \| region	2
Assets	$ 7,649	$ 7,913
Number of countries, revenue greater than one hundred million \| country	8	9
Percentage of revenue	10.00%
Percentage of total revenue by customer	13.00%	14.00%	11.00%
Other International Countries
Segment Reporting Information [Line Items]
Revenues	$ 100

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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.

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- Definition

Number of Regional Segments

+ References

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- Definition

Number of countries, revenue greater than one hundred million

+ References

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- Definition

Percentage of Total Revenues, by Country

+ References

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- Definition

Revenue By Major Customer, Percentage

+ References

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