Goodwill, Customer Relationships and Other Intangible Assets Goodwill, Customer Relationships and Other Intangible Assets (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 93	$ 160	$ 0
Goodwill acquired during period	92	139
Goodwill purchase accounting adjustment	(11)
Cognilytics and Data Gardens
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired	95
Cash acquired from business acquisition	2
Goodwill acquired during period	92
AppFog and Tier 3
Business Acquisition [Line Items]
Payments to acquire businesses, gross		160
Goodwill acquired during period		139
Tier 3
Business Acquisition [Line Items]
Finite-Lived intangible assets purchase accounting adjustment	19
Goodwill purchase accounting adjustment	(11)
Deferred tax assets purchase accounting adjustment	$ (8)