Finance Receivables And Loans, Net (Impaired Financing Receivables) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 1,442	$ 1,434
Carrying value before allowance	1,436	1,349
Impaired Financing Receivable, Related Allowance	249	228
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	269	260
Carrying value before allowance	269	260
Impaired Financing Receivable, Related Allowance	22	16
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	922	958
Carrying value before allowance	916	873
Impaired Financing Receivable, Related Allowance	199	186
First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	779	811
Carrying value before allowance	772	725
Impaired Financing Receivable, Related Allowance	145	137
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	143	147
Carrying value before allowance	144	148
Impaired Financing Receivable, Related Allowance	54	49
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	251	216
Carrying value before allowance	251	216
Impaired Financing Receivable, Related Allowance	28	26
Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	140	146
Carrying value before allowance	140	146
Impaired Financing Receivable, Related Allowance	15	7
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	84	33
Carrying value before allowance	84	33
Impaired Financing Receivable, Related Allowance	11	7
Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	27	37
Carrying value before allowance	27	37
Impaired Financing Receivable, Related Allowance	2	12
Commercial Real Estate 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
Impaired With No Allowance Member
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	190	286
Impaired With No Allowance Member | Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	0	90
Impaired With No Allowance Member | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	125	124
Impaired With No Allowance Member | First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	124	123
Impaired With No Allowance Member | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	1	1
Impaired With No Allowance Member | Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	65	72
Impaired With No Allowance Member | Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	49	54
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	9
Impaired With No Allowance Member | Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	6	9
Impaired With No Allowance Member | Commercial Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	0	0
Impaired With Allowance Member
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	1,246	1,063
Impaired With Allowance Member | Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	269	170
Impaired With Allowance Member | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	791	749
Impaired With Allowance Member | First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	648	602
Impaired With Allowance Member | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	143	147
Impaired With Allowance Member | Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	186	144
Impaired With Allowance Member | Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	91	92
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	74	24
Impaired With Allowance Member | Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	21	28
Impaired With Allowance Member | Commercial Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	$ 0	$ 0