Consolidated Statement of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Revenue and Other Interest Income [Abstract]
Interest and fees on finance receivables and loans	$ 1,166	$ 1,114	$ 3,358	$ 3,345
Interest on loans held-for-sale	2	0	40	1
Interest and dividends on available-for-sale investment securities	102	94	283	282
Interest-bearing cash	2	2	6	6
Operating leases	830	899	2,586	2,653
Total financing revenue and other interest income	2,102	2,109	6,273	6,287
Interest Expense [Abstract]
Interest on deposits	181	166	530	495
Interest on short-term borrowings	13	12	36	40
Interest on long-term debt	410	493	1,258	1,576
Total interest expense	604	671	1,824	2,111
Depreciation expense on operating lease assets	528	549	1,713	1,600
Net financing revenue (loss)	970	889	2,736	2,576
Other revenue [Abstract]
Servicing fees	12	6	32	22
Insurance premiums and service revenue earned	236	246	706	736
Gain (loss) on mortgage and automotive loans, net	(2)	0	45	6
Gains (Losses) on Extinguishment of Debt	0	0	(354)	(46)
Other gain (loss) on investments, net	6	45	106	129
Other income, net of losses	80	78	251	214
Total other revenue	332	375	786	1,061
Total net revenue (loss)	1,302	1,264	3,522	3,637
Provision for loan losses	211	102	467	302
Noninterest Expense [Abstract]
Compensation and benefits expense	235	241	726	710
Insurance losses and loss adjustment expenses	61	97	239	353
Other operating expenses	378	404	1,128	1,213
Total noninterest expense	674	742	2,093	2,276
Income (loss) from continuing operations before income tax expense	417	420	962	1,059
Income tax expense (benefit) from continuing operations	144	127	341	285
Net income (loss) from continuing operations	273	293	621	774
Income (loss) from discontinued operations, net of tax	(5)	130	405	199
Net income (loss)	268	423	1,026	973
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	61	(55)	(56)	126
Comprehensive income (loss)	$ 329	$ 368	$ 970	$ 1,099
Earnings Per Share, Basic [Abstract]
Net income (loss) from continuing operations, Per Basic Share	$ 0.49	$ 0.47	$ (1.52)	$ 1.19
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	(0.01)	0.27	0.84	0.41
Net (loss) income, Basic	0.48	0.74	(0.68)	1.60
Earnings Per Share, Diluted [Abstract]
Net income (loss) from continuing operations, Per Diluted Share	0.49	0.47	(1.52)	1.19
Income (loss) from discontinued operations, net of tax	(0.01)	0.27	0.84	0.41
Net (loss) income, Diluted	$ 0.47	$ 0.74	$ (0.68)	$ 1.60