Goodwill and Intangible Assets (Schedules for Amortization Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Finite Lived Intangible Assets
Amortization expense for acquired intangible assets	$ 58	$ 63	$ 116	$ 117
Expected amortization expense for acquired intangible assets recorded as of balance sheet date
Remainder of 2012	115
2013	216
2014	193
2015	180
2016	167
2017	154
After 2017	$ 696