Balance Sheet Components Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,246us-gaap_PropertyPlantAndEquipmentGross	$ 7,120us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(5,344)	(4,360)
Property and equipment, net	2,902us-gaap_PropertyPlantAndEquipmentNet	2,760us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense	1,100	976	767
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,073	5,179
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	943	931
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	549	512
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	350	290
Construction in Progress and Other [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 331	$ 208

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

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-Section S99

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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

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-Section 50

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- Definition

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 360

-SubTopic 10

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

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-Publisher SEC

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