Consolidated Statement of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Revenue and Other Interest Income [Abstract]
Interest and fees on finance receivables and loans	$ 1,118	$ 1,124	$ 2,192	$ 2,231
Interest on loans held-for-sale	14	1	38	1
Interest and dividends on available-for-sale investment securities	93	93	181	188
Interest-bearing cash	2	1	4	4
Operating leases	860	884	1,756	1,754
Total financing revenue and other interest income	2,087	2,103	4,171	4,178
Interest Expense [Abstract]
Interest on deposits	177	166	349	329
Interest on short-term borrowings	12	13	23	28
Interest on long-term debt	419	549	848	1,083
Total interest expense	608	728	1,220	1,440
Depreciation expense on operating lease assets	563	509	1,185	1,051
Net financing revenue (loss)	916	866	1,766	1,687
Other revenue [Abstract]
Servicing fees	10	7	20	16
Insurance premiums and service revenue earned	237	249	470	490
Gain (loss) on mortgage and automotive loans, net	1	6	47	6
Gains (Losses) on Extinguishment of Debt	(156)	(7)	(354)	(46)
Other gain (loss) on investments, net	45	41	100	84
Other income, net of losses	74	69	171	136
Total other revenue	211	365	454	686
Total net revenue (loss)	1,127	1,231	2,220	2,373
Provision for loan losses	140	63	256	200
Noninterest Expense [Abstract]
Compensation and benefits expense	236	215	491	469
Insurance losses and loss adjustment expenses	122	188	178	256
Other operating expenses	366	418	750	809
Total noninterest expense	724	821	1,419	1,534
Income (loss) from continuing operations before income tax expense	263	347	545	639
Income tax expense (benefit) from continuing operations	94	64	197	158
Net income (loss) from continuing operations	169	283	348	481
Income (loss) from discontinued operations, net of tax	13	40	410	69
Net income (loss)	182	323	758	550
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(148)	89	(117)	181
Comprehensive income (loss)	$ 34	$ 412	$ 641	$ 731
Earnings Per Share, Basic [Abstract]
Net income (loss) from continuing operations, Per Basic Share	$ (2.24)	$ 0.45	$ (2.01)	$ 0.73
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	0.03	0.09	0.85	0.14
Net (loss) income, Basic	(2.22)	0.54	(1.16)	0.87
Earnings Per Share, Diluted [Abstract]
Net income (loss) from continuing operations, Per Diluted Share	(2.24)	0.45	(2.01)	0.73
Income (loss) from discontinued operations, net of tax	0.03	0.09	0.85	0.14
Net (loss) income, Diluted	$ (2.22)	$ 0.54	$ (1.16)	$ 0.87