Finance Receivables And Loans, Net (Average Balance And Interest Income Of Impaired Finance Receivables) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 1,364	$ 1,483	$ 1,385	$ 1,437
Impaired Financing Receivable, Interest Income, Accrual Method	16	15	29	29
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	298	275	297	273
Impaired Financing Receivable, Interest Income, Accrual Method	5	5	9	9
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	930	928	928	899
Impaired Financing Receivable, Interest Income, Accrual Method	7	7	15	15
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	136	280	160	265
Impaired Financing Receivable, Interest Income, Accrual Method	4	3	5	5
Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	68	177	84	167
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	1	3
Commercial And Industrial Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	62	68	67	63
Impaired Financing Receivable, Interest Income, Accrual Method	4	1	4	1
Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	6	35	9	35
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 1	$ 0	$ 1