Intangible Assets and Goodwill (Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 77	$ 53
Accumulated Amortization	54	47
Completed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	37	24
Accumulated Amortization	27	24
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8	8
Accumulated Amortization	4	3
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15	6
Accumulated Amortization	8	6
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17	15
Accumulated Amortization	$ 15	$ 14