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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 1,297	$ 1,475	$ 1,358	$ 1,441
Impaired Financing Receivable, Interest Income, Accrual Method	12	14	41	43
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	297	275	298	274
Impaired Financing Receivable, Interest Income, Accrual Method	5	5	14	14
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	914	924	923	905
Impaired Financing Receivable, Interest Income, Accrual Method	7	7	22	22
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	86	276	137	262
Impaired Financing Receivable, Interest Income, Accrual Method	0	2	5	7
Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	32	163	68	160
Impaired Financing Receivable, Interest Income, Accrual Method	0	2	1	5
Commercial And Industrial Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	51	84	62	69
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	4	1
Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	3	29	7	33
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 0	$ 0	$ 1