Finance Receivables And Loans, Net (Average Balance And Interest Income Of Impaired Finance Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 621	$ 1,364	$ 656	$ 1,385
Impaired Financing Receivable, Interest Income, Accrual Method	8	16	17	29
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	285	298	287	297
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	259	930	289	928
Impaired Financing Receivable, Interest Income, Accrual Method	2	7	4	15
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	77	136	80	160
Impaired Financing Receivable, Interest Income, Accrual Method	1	4	4	5
Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	41	68	38	84
Impaired Financing Receivable, Interest Income, Accrual Method	1	0	1	1
Commercial And Industrial Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	31	62	37	67
Impaired Financing Receivable, Interest Income, Accrual Method	0	4	3	4
Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	5	6	5	9
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 0	$ 0	$ 0