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Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Recorded Investment $ 791   $ 791   $ 712
Loans and Leases Receivable, Impaired, Commitment to Lend $ 7   $ 7   $ 6
Financing Receivable, Modifications, Number of Contracts 5,937 5,782 13,042 12,284  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 174 $ 127 $ 313 $ 277  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 157 $ 111 $ 277 $ 245  
Consumer Portfolio Segment [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 5,932 5,781 13,037 12,282  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 115 $ 106 $ 254 $ 233  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 102 $ 90 $ 222 $ 201  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 5,898 5,762 12,940 12,209  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 107 $ 103 $ 235 $ 218  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 93 $ 88 $ 203 $ 187  
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 34 19 97 73  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 8 $ 3 $ 19 $ 15  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 9 $ 2 $ 19 $ 14  
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 7 0 8 1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 2 $ 0 $ 3 $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 2 $ 0 $ 3 $ 0  
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 27 19 89 72  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 6 $ 3 $ 16 $ 15  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 7 $ 2 $ 16 $ 14  
Commercial Portfolio Segment [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 5 1 5 2  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 59 $ 21 $ 59 $ 44  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 55 $ 21 $ 55 $ 44  
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 2 1 2 2  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 55 $ 21 $ 55 $ 44  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 51 $ 21 $ 51 $ 44  
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 3 0 3 0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 4 $ 0 $ 4 $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 4 $ 0 $ 4 $ 0