Finance Assets, net (Schedule of Credit Quality of Investments in Finance Leases) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Total	$ 4,071	$ 4,704
"AAA/Aaa" to "A-/A3" [Member]
Total	1,789	2,343
"BBB+/Baa1" to "BBB-/Baa3" [Member]
Total	1,129	1,148
"BB+/Ba1" and Lower [Member]
Total	$ 1,153	$ 1,213