Divestitures and Discontinued Operations (Narrative) (Details) (Computer Equipment [Member], USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2007
Computer Equipment [Member]
Proceeds from Divestiture of Interest in Consolidated Subsidiaries		$ 4,900,000,000
settlement for post closing matters	$ 46,500,000