Finance Receivables And Loans, Net (Redefaults) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,616	1,343
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 21	$ 18
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	10	8
Loans and Leases Receivable, Impaired, Commitment to Lend	4		26
Consumer Loans Auto Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,614	1,333
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	20	16
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	10	8
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	10
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	2
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	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
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0