Finance Receivables And Loans, Net (Redefaults) (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	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,795	1,566	5,030	4,325
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 23	$ 21	$ 64	$ 57
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	12	9	33	26
Loans and Leases Receivable, Impaired, Commitment to Lend	4		4		26
Consumer Loans Auto Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,790	1,562	5,020	4,309
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	22	19	62	53
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	12	9	33	26
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	5	4	10	16
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	2	2	4
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
Commercial And Industrial Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0	$ 0	$ 0