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Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Recorded Investment $ 690   $ 690   $ 663
Financing Receivable, Modifications, Number of Contracts 5,782 4,795 12,284 10,449  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 127 $ 84 $ 277 $ 178  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 111 $ 73 $ 245 $ 154  
Consumer Portfolio Segment [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 5,781 4,795 12,282 10,449  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 106 $ 84 $ 233 $ 178  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 90 $ 73 $ 201 $ 154  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 5,762 4,767 12,209 10,389  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 103 $ 79 $ 218 $ 168  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 88 $ 68 $ 187 $ 144  
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 19 28 73 60  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 3 $ 5 $ 15 $ 10  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 2 $ 5 $ 14 $ 10  
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 0 2 1 3  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 1 $ 0 $ 2  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 1 $ 0 $ 2  
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 19 26 72 57  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 3 $ 4 $ 15 $ 8  
Financing Receivable, Modifications, Post-Modification Recorded Investment 2 $ 4 14 $ 8  
Commercial Portfolio Segment [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Loans and Leases Receivable, Impaired, Commitment to Lend $ 4   $ 4   $ 2
Financing Receivable, Modifications, Number of Contracts 1 0 2 0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 21 $ 0 $ 44 $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 21 $ 0 $ 44 $ 0  
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 1 0 2 0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 21 $ 0 $ 44 $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 21 $ 0 $ 44 $ 0