Additional Information (Schedule Of Additional Information) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Additional Information [Abstract]
Research and development expense	$ 136	$ 128	$ 144
Advertising expense	6	5	5
Interest expense	1,128	1,220	1,136
Interest income	(2)	(4)	(3)
Interest and other debt expense, net	1,126	1,216	1,133
Rent expense	$ 49	$ 63	$ 58