Finance Receivables And Loans, Net (Redefaults) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,619	1,416	3,235	2,759
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 20	$ 18	$ 41	$ 36
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	11	9	21	17
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	1,616	1,414	3,230	2,747
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	20	18	40	34
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	11	9	21	17
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	3	2	5	12
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	1	2
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