Consolidated Balance Sheet - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Assets [Abstract]
Noninterest-bearing cash and cash equivalents	$ 1,906	$ 2,148
Interest-bearing cash and cash equivalents	3,095	4,232
Total cash and cash equivalents	5,001	6,380
Available-for-sale securities	18,180	17,157
Held-to-maturity securities	118	0
Loans held-for-sale, net	39	105
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	110,876	111,600
Allowance for loan losses	(1,077)	(1,054)
Total finance receivables and loans, net	109,799	110,546
Investment in operating leases, net	14,958	16,271
Premiums receivable and other insurance assets	1,828	1,801
Other assets	6,582	6,321
Total assets	156,505	158,581
Liabilities and Equity [Abstract]
Noninterest-bearing deposit liabilities	92	89
Interest-bearing deposit liabilities	70,173	66,389
Total deposit liabilities	70,265	66,478
Short-term borrowings	5,365	8,101
Long-term debt	62,044	66,234
Interest payable	374	350
Unearned insurance premiums and service revenue	2,449	2,434
Accrued expenses and other liabilities	2,185	1,545
Total liabilities	142,682	145,142
Equity [Abstract]
Common stock and paid-in-capital	21,117	21,100
Preferred stock	696	696
Accumulated deficit	(7,875)	(8,110)
Accumulated other comprehensive loss	(85)	(231)
Treasury stock, at cost	(30)	(16)
Total equity	13,823	13,439
Total liabilities and equity	156,505	158,581
Variable Interest Entity, Primary Beneficiary [Member]
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	27,626	27,929
Allowance for loan losses	(210)	(196)
Total finance receivables and loans, net	27,416	27,733
Investment in operating leases, net	4,060	4,791
Other assets	1,563	1,624
Total assets	33,039	34,148
Liabilities and Equity [Abstract]
Long-term debt	18,868	20,267
Accrued expenses and other liabilities	21	22
Total liabilities	$ 18,889	$ 20,289