Finance Receivables And Loans, Net (Redefaults) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,566	162	4,325	561
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 21	$ 4	$ 57	$ 16
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	9	1	26	5
Loans and Leases Receivable, Impaired, Commitment to Lend	25		25		25
Consumer Loans Auto Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,562	145	4,309	514
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	19	2	53	5
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	9	0	26	2
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	4	17	16	42
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2	2	4	6
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	1	0	3
First Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	4	5	14	17
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2	1	4	4
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	1
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	12	2	25
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	1	0	2
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	1	0	2
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	5
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	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	3
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	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	2
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0	$ 0	$ 0