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Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 118,871   $ 118,944 $ 114,959
Derivative, Amount of Hedged Item 274   315  
Loans and Finance Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 494   359  
Consumer Portfolio Segment [Member] | Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross 79,092   76,843  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross 67,077   65,793 64,816
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Derivative, Amount of Hedged Item 24   43  
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross 12,015   11,050 10,857
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross 9,760   8,294  
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans $ 24   30  
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Two years and six months, or less [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest-only mortgage loan portfolio principal amortization 35.00%      
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Three years and six months, or less [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest-only mortgage loan portfolio principal amortization 44.00%      
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 2,255   2,756  
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans   $ 538 714  
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | One year and six months, or less [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest-only mortgage loan portfolio principal amortization 2.00%      
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Four years and six months, or greater [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest-only mortgage loan portfolio principal amortization   1.00%    
Commercial Portfolio Segment [Member] | Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 39,779   42,101 $ 39,286
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross 31,985   35,041  
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross 3,774   3,248  
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 4,020   $ 3,812