Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,276	$ 1,936
Less accumulated depreciation and amortization	(1,030)	(807)
Property and equipment, net	1,246	1,129
Software and internally developed software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 766	600
Software and internally developed software \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	1 year
Software and internally developed software \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	8 years
Computer and network equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 575	483
Computer and network equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	1 year
Computer and network equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 137	136
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 289	259
Buildings and building improvements \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years 6 months
Buildings and building improvements \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	40 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 234	216
Leasehold improvements \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	1 year
Leasehold improvements \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	17 years
Equipment, aircraft and office furniture
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 275	$ 242
Equipment, aircraft and office furniture \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	1 year
Equipment, aircraft and office furniture \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	12 years

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: 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)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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