Segment And Geographic Information (Financial Information Operating Segments) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net financing revenue (loss)	$ 821,000,000	$ 640,000,000
Other revenue	321,000,000	386,000,000
Total net revenue (loss)	1,142,000,000	1,026,000,000
Provision for loan losses	137,000,000	131,000,000
Total noninterest expense	713,000,000	958,000,000
Income (loss) from continuing operations before income tax expense	292,000,000	(63,000,000)
Assets	148,452,000,000	166,199,000,000	151,167,000,000
Net Interest Income (Loss) after Provision for Loan Losses	700,000,000	500,000,000
Automotive finance operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	820,000,000	773,000,000
Other revenue	64,000,000	82,000,000
Total net revenue (loss)	884,000,000	855,000,000
Provision for loan losses	159,000,000	112,000,000
Total noninterest expense	386,000,000	400,000,000
Income (loss) from continuing operations before income tax expense	339,000,000	343,000,000
Assets	109,307,000,000	118,882,000,000
Insurance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	15,000,000	12,000,000
Other revenue	272,000,000	308,000,000
Total net revenue (loss)	287,000,000	320,000,000
Provision for loan losses	0	0
Total noninterest expense	213,000,000	259,000,000
Income (loss) from continuing operations before income tax expense	74,000,000	61,000,000
Assets	7,184,000,000	8,331,000,000
Mortgage Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	14,000,000	34,000,000
Other revenue	4,000,000	(19,000,000)
Total net revenue (loss)	18,000,000	15,000,000
Provision for loan losses	(23,000,000)	20,000,000
Total noninterest expense	24,000,000	199,000,000
Income (loss) from continuing operations before income tax expense	17,000,000	(204,000,000)
Assets	7,937,000,000	11,284,000,000
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	(28,000,000)	(179,000,000)
Other revenue	(19,000,000)	15,000,000
Total net revenue (loss)	(47,000,000)	(164,000,000)
Provision for loan losses	1,000,000	(1,000,000)
Total noninterest expense	90,000,000	100,000,000
Income (loss) from continuing operations before income tax expense	(138,000,000)	(263,000,000)
Assets	24,024,000,000	27,702,000,000
Commercial Finance Operations [Member]
Segment Reporting Information [Line Items]
Assets	$ 1,700,000,000	$ 1,400,000,000