Goodwill and Purchased Intangible Assets - Amorization Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 30	$ 60
Amortization expense for the remainder of the year	61	61
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2015	127	127
2016	125	125
2017	116	116
2018	85	85
2019	$ 76	$ 76