Finance Receivables And Loans, Net (Average Balance And Interest Income Of Impaired Finance Receivables) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 1,411	$ 1,403
Impaired Financing Receivable, Interest Income, Accrual Method	13	14
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	294	272
Impaired Financing Receivable, Interest Income, Accrual Method	4	4
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	928	879
Impaired Financing Receivable, Interest Income, Accrual Method	8	8
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	189	252
Impaired Financing Receivable, Interest Income, Accrual Method	1	2
Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	104	157
Impaired Financing Receivable, Interest Income, Accrual Method	1	2
Commercial And Industrial Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	74	57
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	11	38
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 0