Intangible Assets And Goodwill (Goodwill) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Goodwill Activity
Aggregate goodwill acquired/disposed	$ 2,992
Accumulated impairment losses	(1,564)
Goodwill, net of impairment losses	1,428
Goodwill acquired	3
Goodwill disposed	(1)
Aggregate goodwill acquired/disposed	2,994
Accumulated impairment losses	(1,564)
Goodwill, net of impairment losses	1,430
Government [Member]
Goodwill Activity
Aggregate goodwill acquired/disposed	350
Accumulated impairment losses	0
Goodwill, net of impairment losses	350
Goodwill acquired	0
Goodwill disposed	(1)
Aggregate goodwill acquired/disposed	349
Accumulated impairment losses	0
Goodwill, net of impairment losses	349
Enterprise [Member]
Goodwill Activity
Aggregate goodwill acquired/disposed	2,642
Accumulated impairment losses	(1,564)
Goodwill, net of impairment losses	1,078
Goodwill acquired	3
Goodwill disposed	0
Aggregate goodwill acquired/disposed	2,645
Accumulated impairment losses	(1,564)
Goodwill, net of impairment losses	$ 1,081