Fair Value Measurements Fair Value, Assets Measured on Nonrecurring Basis Using Unobservable Inputs (Details) (Fair Value Measurements Nonrecurring [Member], Level 3 [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Fair Value Measurements Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equipment Under Operating Leases and Assets Held For Sale or Re-Lease, Fair Value	$ 28	$ 25
Equipment under operating leases & Assets held for sale or release, Total Losses	(21)	(31)
Property, Plant, and Equipment, Fair Value Disclosure	6
Property Plant and Equipment, Total Losses	(5)
Total Fair Value	34	25
Total Losses	$ (26)	$ (31)