Goodwill and Intangible Assets (Schedules for Amortization Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Finite Lived Intangible Assets
Amortization expense for acquired intangible assets	$ 50	$ 57	$ 103	$ 114
Expected amortization expense for acquired intangible assets recorded as of balance sheet date
Remainder of 2015	96		96
2016	178		178
2017	156		156
2018	141		141
2019	128		128
2020	119		119
After 2020	$ 421		$ 421