Finance Receivables And Loans, Net (Impaired Financing Receivables) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 1,150	$ 1,021
Carrying value before allowance	1,073	1,014
Impaired Financing Receivable, Related Allowance	207	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	9	7
First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	676	516
Carrying value before allowance	598	508
Impaired Financing Receivable, Related Allowance	127	126
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	90	97
Carrying value before allowance	91	98
Impaired Financing Receivable, Related Allowance	39	46
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	766	613
Carrying value before allowance	689	606
Impaired Financing Receivable, Related Allowance	166	172
Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	201	222
Carrying value before allowance	201	222
Impaired Financing Receivable, Related Allowance	12	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	37	37
Carrying value before allowance	37	37
Impaired Financing Receivable, Related Allowance	6	5
Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	49	68
Carrying value before allowance	49	68
Impaired Financing Receivable, Related Allowance	14	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	287	339
Carrying value before allowance	287	339
Impaired Financing Receivable, Related Allowance	32	50
Impaired With Allowance Member
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	872	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	506	425
Impaired With Allowance Member | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	91	98
Impaired With Allowance Member | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	597	523
Impaired With Allowance Member | Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	116	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	27	12
Impaired With Allowance Member | Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	35	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	178	217
Impaired With No Allowance Member
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	201	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	92	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	92	83
Impaired With No Allowance Member | Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Carrying value before allowance	85	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	$ 109	$ 122