Securitizations and Variable Interest Entities (Schedule of On-balance Sheet Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
On-balance Sheet Variable Interest Entities [Line Items]
Finance receivables and loans, net	$ 99,948	$ 100,328
Loans and Leases Receivable, Allowance	(977)	(1,208)	(1,170)
Total finance receivables and loans, net	98,971	99,120
Investment in operating leases, net	19,510	17,680
Other Assets	7,302	9,589
Assets	151,828	151,167	182,347
Short-term borrowings	7,062	8,545
Long-term debt	66,558	69,465
Accrued expenses and other liabilities	1,735	2,397
Liabilities	136,429	136,959
Variable Interest Entity, Primary Beneficiary [Member]
On-balance Sheet Variable Interest Entities [Line Items]
Finance receivables and loans, net	30,081	32,265
Loans and Leases Receivable, Allowance	(179)	(174)
Total finance receivables and loans, net	29,902	32,091
Investment in operating leases, net	5,595	4,620
Other Assets	2,010	3,436
Assets	37,507	40,147
Short-term borrowings	0	250
Long-term debt	24,343	24,147
Accrued expenses and other liabilities	173	43
Liabilities	24,516	24,440
Variable Interest Entity, Primary Beneficiary [Member] | Consumer Portfolio Segment [Member]
On-balance Sheet Variable Interest Entities [Line Items]
Finance receivables and loans, net	12,594	13,291
Variable Interest Entity, Primary Beneficiary [Member] | Commercial Portfolio Segment [Member]
On-balance Sheet Variable Interest Entities [Line Items]
Finance receivables and loans, net	$ 17,487	$ 18,974