Finance Receivables And Loans, Net (Redefaults) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,502	1,619	3,087	3,235
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 18	$ 20	$ 37	$ 41
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	10	$ 11	21	$ 21
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 6		$ 6		$ 4
Consumer Loans Auto Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,499	1,616	3,080	3,230
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 18	$ 20	$ 37	$ 40
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 10	$ 11	$ 21	$ 21
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	3	3	7	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0	$ 1
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