Segment Reporting - Segment Revenue and Segment Profit (Loss) (Details) $ in Millions	3 Months Ended
Mar. 31, 2017 USD ($) service_offering business	Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of Publicly Traded Companies \| business	2
Primary reportable segments \| service_offering	3
Segment Revenue	$ 1,553	$ 1,685
Segment Profit (Loss)	86	71
Commercial Industries segment [Member]
Segment Reporting Information [Line Items]
Segment Revenue	923	1,007
Segment Profit (Loss)	29	26
Public Sector [Member]
Segment Reporting Information [Line Items]
Segment Revenue	549	571
Segment Profit (Loss)	61	61
Other Segments [Member]
Segment Reporting Information [Line Items]
Segment Revenue	81	107
Segment Profit (Loss)	$ (4)	$ (16)

Number of Publicly Traded Companies

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- Definition

Amount of profit or loss recognized by the reportable segment.

+ References

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+ Details

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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+ Details

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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=26872669&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

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