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Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Recorded Investment $ 640   $ 640   $ 625
Financing Receivable, Modifications, Number of Contracts 4,464 4,667 14,913 12,934,000,000  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 76 $ 112 $ 254 $ 268  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 64 $ 103 $ 218 $ 237  
Consumer Portfolio Segment [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 4,464 4,665 14,913 12,932,000,000  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 76 $ 88 $ 254 $ 244  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 64 $ 79 $ 218 $ 213  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 4,427 4,612 14,816 12,763,000,000  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 70 $ 75 $ 238 $ 202  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 58 $ 66 $ 202 $ 173  
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 37 53 97 169,000,000  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 6 $ 13 $ 16 $ 42  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 6 $ 13 $ 16 $ 40  
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 2 3 5 5,000,000  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 2 $ 2 $ 3  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 2 $ 2 $ 3  
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 35 50 92 164,000,000  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 6 $ 11 $ 14 $ 39  
Financing Receivable, Modifications, Post-Modification Recorded Investment 6 $ 11 14 $ 37  
Commercial Portfolio Segment [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Loans and Leases Receivable, Impaired, Commitment to Lend $ 2   $ 2   $ 2
Financing Receivable, Modifications, Number of Contracts 0 2 0 2,000,000  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 24 $ 0 $ 24  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 24 $ 0 $ 24  
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 0 0 0 0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 0 $ 0 $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 0 $ 0 $ 0  
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 0 1 0 1,000,000  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 21 $ 0 $ 21  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 21 $ 0 $ 21  
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 0 1 0 1,000,000  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 3 $ 0 $ 3  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 3 $ 0 $ 3