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Finance Receivables And Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Finance receivables and loans, net $ 107,991   $ 107,991   $ 99,948
Interest and Fee Income, Loans and Leases 1,166 $ 1,114 3,358 $ 3,345  
Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Hedged Item [Member] | Interest Rate Contract [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest and Fee Income, Loans and Leases 38 $ (15) 73 $ 14  
Fair Value Option Election, Fair Value [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Finance receivables and loans, net $ 107,991   107,991   99,948
Fair Value Option Election, Fair Value [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Hedged Item [Member] | Interest Rate Contract [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest and Fee Income, Loans and Leases     $ 107   35
One year or less [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest-only mortgage loan portfolio principal amortization 8.00%   8.00%    
Two years or less [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest-only mortgage loan portfolio principal amortization 33.00%   33.00%    
Three years or less [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest-only mortgage loan portfolio principal amortization 21.00%   21.00%    
Four years or less [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest-only mortgage loan portfolio principal amortization 2.00%   2.00%    
Five years or greater [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest-only mortgage loan portfolio principal amortization 4.00%   4.00%    
loans held-for-investment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ 43   $ 43   266
Consumer Portfolio Segment [Member] | Automobile Loan [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Finance receivables and loans, net 63,610   63,610   56,570
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Finance receivables and loans, net 9,770   9,770   7,474
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans 1,000   1,000   1,200
Loans Receivable, Fair Value Disclosure 1   1   1
Commercial Portfolio Segment [Member] | Commercial Loan [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Finance receivables and loans, net 34,611   34,611   35,904
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Finance receivables and loans, net 29,020   29,020   30,871
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Finance receivables and loans, net 2,289   2,289   1,882
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Finance receivables and loans, net $ 3,302   $ 3,302   $ 3,151