Segment And Geographic Information (Financial Information Operating Segments) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net financing revenue (loss)	$ 866,000,000	$ 628,000,000	$ 1,687,000,000	$ 1,268,000,000
Other revenue	365,000,000	402,000,000	686,000,000	788,000,000
Total net revenue (loss)	1,231,000,000	1,030,000,000	2,373,000,000	2,056,000,000
Provision for loan losses	63,000,000	89,000,000	200,000,000	220,000,000
Total noninterest expense	821,000,000	801,000,000	1,534,000,000	1,759,000,000
Income (loss) from continuing operations before income tax expense	347,000,000	140,000,000	639,000,000	77,000,000
Assets	149,937,000,000	150,627,000,000	149,937,000,000	150,627,000,000	151,167,000,000
Net Interest Income (Loss) after Provision for Loan Losses	800,000,000	500,000,000	1,500,000,000	1,000,000,000
Automotive finance operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	884,000,000	777,000,000	1,704,000,000	1,550,000,000
Other revenue	62,000,000	60,000,000	126,000,000	142,000,000
Total net revenue (loss)	946,000,000	837,000,000	1,830,000,000	1,692,000,000
Provision for loan losses	99,000,000	88,000,000	258,000,000	200,000,000
Total noninterest expense	386,000,000	367,000,000	772,000,000	767,000,000
Income (loss) from continuing operations before income tax expense	461,000,000	382,000,000	800,000,000	725,000,000
Assets	111,334,000,000	107,485,000,000	111,334,000,000	107,485,000,000
Insurance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	16,000,000	15,000,000	31,000,000	27,000,000
Other revenue	290,000,000	325,000,000	562,000,000	633,000,000
Total net revenue (loss)	306,000,000	340,000,000	593,000,000	660,000,000
Provision for loan losses	0	0	0	0
Total noninterest expense	329,000,000	295,000,000	542,000,000	554,000,000
Income (loss) from continuing operations before income tax expense	(23,000,000)	45,000,000	51,000,000	106,000,000
Assets	7,232,000,000	7,336,000,000	7,232,000,000	7,336,000,000
Mortgage Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	12,000,000	15,000,000	26,000,000	49,000,000
Other revenue	9,000,000	(6,000,000)	13,000,000	(25,000,000)
Total net revenue (loss)	21,000,000	9,000,000	39,000,000	24,000,000
Provision for loan losses	(25,000,000)	6,000,000	(48,000,000)	26,000,000
Total noninterest expense	19,000,000	46,000,000	43,000,000	245,000,000
Income (loss) from continuing operations before income tax expense	27,000,000	(43,000,000)	44,000,000	(247,000,000)
Assets	7,640,000,000	9,061,000,000	7,640,000,000	9,061,000,000
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	(46,000,000)	(179,000,000)	(74,000,000)	(358,000,000)
Other revenue	4,000,000	23,000,000	(15,000,000)	38,000,000
Total net revenue (loss)	(42,000,000)	(156,000,000)	(89,000,000)	(320,000,000)
Provision for loan losses	(11,000,000)	(5,000,000)	(10,000,000)	(6,000,000)
Total noninterest expense	87,000,000	93,000,000	177,000,000	193,000,000
Income (loss) from continuing operations before income tax expense	(118,000,000)	(244,000,000)	(256,000,000)	(507,000,000)
Assets	23,731,000,000	26,745,000,000	23,731,000,000	26,745,000,000
Commercial Finance Operations [Member]
Segment Reporting Information [Line Items]
Assets	$ 1,700,000,000	$ 1,500,000,000	$ 1,700,000,000	$ 1,500,000,000