Finance Assets, net (Summary of Net Investments in Finance Leases) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Rents receivable, net - Leveraged Leases	$ 1,423	$ 2,378
Unguaranteed residual values - Leveraged Leases	1,040	1,068
Unearned income - Leveraged Leases	(572)	(968)
Investments in finance leases - Leveraged Leases	1,891	2,478
Deferred income taxes - Leveraged Leases	(1,376)	(1,654)
Net investments in finance leases - Leveraged Leases	515	824
Rents receivable, net - Direct Finance Leases	72	116
Unguaranteed residual values - Direct Finance Leases	87	87
Unearned income - Direct Finance Leases	(1)	(1)
Net investments in finance leases - Direct Finance Leases	158	202
Deferred income taxes - Direct Finance Leases	(64)	(89)
Capital Leases, Net Investment in Direct Financing Leases, Net of Taxes	94	113
Rents receivable, net	1,495	2,494
Unguaranteed residual values	1,127	1,155
Unearned income	(573)	(969)
Investment in finance lease	2,049	2,680
Deferred income taxes	(1,440)	(1,743)
Net investments in finance leases	$ 609	$ 937