Acquisition And Restructuring Costs (Costs Related To Acquisition And Restructuring) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Acquisition And Restructuring Costs [Abstract]
Acquisition costs		$ 16	$ 89	$ 49
Restructuring charges	120	253	156
Total		$ 269	$ 245	$ 49