Consolidated Statement of Income (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Financing Revenue and Other Interest Income [Abstract]
Interest and fees on finance receivables and loans	$ 1,135		$ 1,093
Interest on loans held-for-sale	16		31
Interest on trading assets	0		9
Interest and dividends on available-for-sale investment securities	68		74
Interest-bearing cash	3		2
Operating leases	734		507
Total financing revenue and other interest income	1,956		1,716
Interest Expense [Abstract]
Interest on deposits	164		163
Interest on short-term borrowings	16		17
Interest on long-term debt	701		880
Total interest expense	881		1,060
Depreciation expense on operating lease assets	435		305
Net financing revenue (loss)	640		351
Other revenue [Abstract]
Servicing fees	82		122
Servicing asset valuation and hedge activities, net	(201)		(106)
Total servicing income, net	(119)		16
Insurance premiums and service revenue earned	259		270
Gain (loss) on mortgage and automotive loans, net	38		20
Other gain (loss) on investments, net	51		89
Other income, net of losses	157		210
Total other revenue	386		605
Total net revenue (loss)	1,026		956
Provision for loan losses	131		98
Noninterest Expense [Abstract]
Compensation and benefits expense	285		303
Insurance losses and loss adjustment expenses	115		98
Other operating expenses	558		454
Total noninterest expense	958		855
Income (loss) from continuing operations before income tax expense	(63)		3
Income tax expense (benefit) from continuing operations	(123)		1
Net income (loss) from continuing operations	60		2
Income (loss) from discontinued operations, net of tax	1,033		308
Net income (loss)	1,093		310
Other comprehensive income (loss), net of tax	(317)		187
Comprehensive income (loss)	776		497
Net income (loss) attributable to common shareholders [Abstract]
Net income (loss) from continuing operations	60		2
Preferred stock dividends - U.S. Department of Treasury	(133)		(134)
Preferred stock dividends	(67)		(67)
Net income (loss) from continuing operations attributable to common shareholders	(140)		(199)
Income (loss) from discontinued operations, net of tax	1,033		308
Net income (loss) attributable to common shareholders	$ 893		$ 109
Basic weighted-average common shares outstanding	1,330,970		1,330,970
Diluted weighted-average common shares outstanding	1,330,970	[1]	1,330,970	[1]
Earnings Per Share, Basic [Abstract]
Net income (loss) from continuing operations, Per Basic Share	$ (105)		$ (149)
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ 776		$ 231
Net (loss) income, Basic	$ 671		$ 82
Earnings Per Share, Diluted [Abstract]
Net income (loss) from continuing operations, Per Diluted Share	$ (105)	[1]	$ (149)	[1]
Income (loss) from discontinued operations, net of tax	$ 776	[1]	$ 231	[1]
Net (loss) income, Diluted	$ 671	[1]	$ 82	[1]

[1] Due to the antidilutive effect of converting the Fixed Rate Cumulative Mandatorily Convertible Preferred Stock into common shares and the net loss from continuing operations attributable to common shareholders for the three months ended March 31, 2013 and 2012, loss from continuing operations attributable to common shareholders and basic weighted-average common shares outstanding were used to calculate basic and diluted earnings per share.