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Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 125,544 $ 122,893 $ 120,528
Loans and Finance Receivables [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 612 551  
Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 85,604 81,821  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 70,473 68,071 66,774
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 15,131 13,750 11,294
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 13,328 11,657  
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans $ 18 20  
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | 2019 or sooner [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 36.00%    
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | 2020, or sooner [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 48.00%    
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 1,803 2,093  
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans $ 416 496  
Held For Investment Mortgage Finance Receivables Exited Interest Only Mortgage Loans 99.00%    
Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 39,940 41,072 $ 42,460
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 31,501 33,025  
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 4,027 3,887  
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 4,412 $ 4,160