Land, Buildings, Equipment and Software, Net - Internal Use Software (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant, Equipment and Software [Line Items]
Internal use software	$ 91	$ 82	$ 77
Product software	23	23	28
Internal use software	383	434
Product software	$ 115	307
Internal Use and Product Software, Useful Lives Minimum	3 years
Internal Use and Product Software, Useful Lives Maximum	10 years
Asset impairments	$ 153	7	$ 1
Government services [Member]
Property, Plant, Equipment and Software [Line Items]
Internal use software	55	$ 250
Software Development [Member]
Property, Plant, Equipment and Software [Line Items]
Asset impairments	$ 160

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228

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Additions made to capitalized computer software costs during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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Unamortized costs incurred for development of computer software, which is to be sold, leased or otherwise marketed, after establishing technological feasibility through to the general release of the software products. Excludes capitalized costs of developing software for internal use.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 17
-Article 5

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Payments to develop software, net of discontinued operations

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