Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Financing Revenue and Other Interest Income [Abstract]
Interest and fees on finance receivables and loans	$ 1,074	$ 1,107
Interest on loans held-for-sale	24	0
Interest and dividends on available-for-sale investment securities	88	95
Interest-bearing cash	2	3
Operating leases	896	870
Total financing revenue and other interest income	2,084	2,075
Interest Expense [Abstract]
Interest on deposits	172	163
Interest on short-term borrowings	11	15
Interest on long-term debt	429	534
Total interest expense	612	712
Depreciation expense on operating lease assets	622	542
Net financing revenue (loss)	850	821
Other revenue [Abstract]
Servicing fees	10	9
Insurance premiums and service revenue earned	233	241
Gain (loss) on mortgage and automotive loans, net	46	0
Gains (Losses) on Extinguishment of Debt	(198)	(39)
Other gain (loss) on investments, net	55	43
Other income, net of losses	97	67
Total other revenue	243	321
Total net revenue (loss)	1,093	1,142
Provision for loan losses	116	137
Noninterest Expense [Abstract]
Compensation and benefits expense	255	254
Insurance losses and loss adjustment expenses	56	68
Other operating expenses	384	391
Total noninterest expense	695	713
Income (loss) from continuing operations before income tax expense	282	292
Income tax expense (benefit) from continuing operations	103	94
Net income (loss) from continuing operations	179	198
Income (loss) from discontinued operations, net of tax	397	29
Net income (loss)	576	227
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	31	92
Comprehensive income (loss)	$ 607	$ 319
Earnings Per Share, Basic [Abstract]
Net income (loss) from continuing operations, Per Basic Share	$ 0.23	$ 0.27
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ 0.82	$ 0.06
Net (loss) income, Basic	$ 1.06	$ 0.33
Earnings Per Share, Diluted [Abstract]
Net income (loss) from continuing operations, Per Diluted Share	$ 0.23	$ 0.27
Income (loss) from discontinued operations, net of tax	$ 0.82	$ 0.06
Net (loss) income, Diluted	$ 1.06	$ 0.33