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Finance Receivables And Loans, Net (Redefaults) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 6,846 7,144
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 83 $ 92
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 47 48
Loans and Leases Receivable, Impaired, Commitment to Lend $ 2 $ 4
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 6,836 7,117
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 82 $ 90
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down $ 47 $ 47
Consumer Portfolio Segment [Member] | Mortgage Finance [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
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 10 27
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 1 $ 2
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down $ 0 $ 1