Finance Receivables And Loans, Net (Average Balance And Interest Income Of Impaired Finance Receivables) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 1,475	$ 1,133	$ 1,441	$ 1,074
Impaired Financing Receivable, Interest Income, Accrual Method	14	18	43	47
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	275	97	274	91
Impaired Financing Receivable, Interest Income, Accrual Method	5	2	14	7
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	924	719	905	669
Impaired Financing Receivable, Interest Income, Accrual Method	7	11	22	24
First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	778	628	764	574
Impaired Financing Receivable, Interest Income, Accrual Method	6	10	18	21
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	146	91	141	95
Impaired Financing Receivable, Interest Income, Accrual Method	1	1	4	3
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	276	317	262	314
Impaired Financing Receivable, Interest Income, Accrual Method	2	5	7	16
Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	163	229	160	212
Impaired Financing Receivable, Interest Income, Accrual Method	2	4	5	9
Commercial And Industrial Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	0	0	0	6
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Commercial And Industrial Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	84	37	69	32
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	1	5
Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	29	51	33	57
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	1	2
Commercial Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	0	0	0	7
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 0	$ 0	$ 0