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Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Recorded Investment $ 715   $ 715   $ 663
Financing Receivable, Modifications, Number of Contracts 7,208 4,464 19,492 14,913  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 100 $ 76 $ 377 $ 254  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 95 $ 64 $ 340 $ 218  
Consumer Portfolio Segment [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 7,204 4,464 19,486 14,913  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 84 $ 76 $ 317 $ 254  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 79 $ 64 $ 280 $ 218  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 7,165 4,427 19,374 14,816  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 80 $ 70 $ 298 $ 238  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 75 $ 58 $ 262 $ 202  
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 39 37 112 97  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 4 $ 6 $ 19 $ 16  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 4 $ 6 $ 18 $ 16  
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 2 2 3 5  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 0 $ 0 $ 2  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 0 $ 0 $ 2  
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 37 35 109 92  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 4 $ 6 $ 19 $ 14  
Financing Receivable, Modifications, Post-Modification Recorded Investment 4 $ 6 18 $ 14  
Commercial Portfolio Segment [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Loans and Leases Receivable, Impaired, Commitment to Lend $ 7   $ 7   $ 2
Financing Receivable, Modifications, Number of Contracts 4 0 6 0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 16 $ 0 $ 60 $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 16 $ 0 $ 60 $ 0  
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 $ 13 $ 0 $ 13 $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 13 $ 0 $ 13 $ 0  
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts     2 0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment     $ 44 $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment     $ 44 $ 0  
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts 1 0 1 0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 3 $ 0 $ 3 $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 3 $ 0 $ 3 $ 0