Fair Value Measurements (Nonrecurring Losses Recognized and the Carrying Value and Asset Classification of the Related Assets Still Held) (Details) (USD $) In Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Carrying value	$ 47	$ 75
Total losses	(16)	(19)
Operating Lease Equipment [Member]
Carrying value	39	75
Total losses	(15)	(15)
Acquired Intangible Asset [Member]
Carrying value	8
Total losses	(1)
Property, Plant and Equipment [Member]
Total losses		$ (4)