Finance Receivables And Loans, Net (Impaired Financing Receivables) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 1,262	$ 1,021
Carrying value before allowance	1,181	1,014
Impaired Financing Receivable, Related Allowance	220	229
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	97	69
Carrying value before allowance	97	69
Impaired Financing Receivable, Related Allowance	10	7
First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	728	516
Carrying value before allowance	646	508
Impaired Financing Receivable, Related Allowance	133	126
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	91	97
Carrying value before allowance	92	98
Impaired Financing Receivable, Related Allowance	39	46
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	819	613
Carrying value before allowance	738	606
Impaired Financing Receivable, Related Allowance	172	172
Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	257	222
Carrying value before allowance	257	222
Impaired Financing Receivable, Related Allowance	15	22
Commercial And Industrial Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	0	0
Carrying value before allowance	0	0
Impaired Financing Receivable, Related Allowance	0	0
Commercial And Industrial Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	36	37
Carrying value before allowance	36	37
Impaired Financing Receivable, Related Allowance	7	5
Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	53	68
Carrying value before allowance	53	68
Impaired Financing Receivable, Related Allowance	16	18
Commercial Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	0	12
Carrying value before allowance	0	12
Impaired Financing Receivable, Related Allowance	0	5
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	346	339
Carrying value before allowance	346	339
Impaired Financing Receivable, Related Allowance	38	50
Impaired With Allowance Member
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	963	809
Impaired With Allowance Member | Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	97	69
Impaired With Allowance Member | First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	545	425
Impaired With Allowance Member | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	92	98
Impaired With Allowance Member | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	637	523
Impaired With Allowance Member | Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	164	158
Impaired With Allowance Member | Commercial And Industrial Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	0	0
Impaired With Allowance Member | Commercial And Industrial Other [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	26	12
Impaired With Allowance Member | Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	39	36
Impaired With Allowance Member | Commercial Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	0	11
Impaired With Allowance Member | Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	229	217
Impaired With No Allowance Member
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	218	205
Impaired With No Allowance Member | Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	0	0
Impaired With No Allowance Member | First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	101	83
Impaired With No Allowance Member | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	0	0
Impaired With No Allowance Member | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	101	83
Impaired With No Allowance Member | Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	93	64
Impaired With No Allowance Member | Commercial And Industrial Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	0	0
Impaired With No Allowance Member | Commercial And Industrial Other [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	10	25
Impaired With No Allowance Member | Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	14	32
Impaired With No Allowance Member | Commercial Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	0	1
Impaired With No Allowance Member | Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	$ 117	$ 122