Finance Assets, Net (Summary Of Net Investments In Finance Leases) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Finance Assets, Net [Abstract]
Rents receivable, net - Leveraged Leases	$ 2,378	$ 3,926
Unguaranteed residual values - Leveraged Leases	1,068	1,306
Unearned income - Leveraged Leases	(968)	(1,692)
Investments in finance leases - Leveraged Leases	2,478	3,540
Deferred income taxes - Leveraged Leases	(1,654)	(2,793)
Net investments in finance leases - Leveraged Leases	824	747
Rents receivable, net - Direct Finance Leases	116	162
Unguaranteed residual values - Direct Finance Leases	87	86
Unearned income - Direct Finance Leases	(1)	(2)
Investments in finance leases - Direct Finance Leases	202	246
Deferred income taxes - Direct Finance Leases	(89)	(107)
Net investments in finance leases - Direct Finance Leases	113	139
Rents receivable, net	2,494	4,088
Unguaranteed residual values	1,155	1,392
Unearned income	(969)	(1,694)
Investment in finance leases	2,680	3,786
Deferred income taxes	(1,743)	(2,900)
Net investments in finance leases	$ 937	$ 886