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Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Financing Receivable, Modifications [Line Items]          
Financing receivable, modifications, gross carrying value $ 790   $ 790   $ 712
Loans and leases receivable, impaired, commitment to lend $ 4   $ 4   $ 6
Financing receivable, modifications, number of loans 6,834 7,208 19,876 19,492  
Financing receivable, modifications, pre-modification gross carrying value $ 79 $ 100 $ 392 $ 377  
Financing receivable, modifications, post-modification gross carrying value $ 77 $ 95 $ 354 $ 340  
Consumer portfolio segment | Consumer loan          
Financing Receivable, Modifications [Line Items]          
Financing receivable, modifications, number of loans 6,834 7,204 19,871 19,486  
Financing receivable, modifications, pre-modification gross carrying value $ 79 $ 84 $ 333 $ 317  
Financing receivable, modifications, post-modification gross carrying value $ 77 $ 79 $ 299 $ 280  
Consumer portfolio segment | Automobile loan          
Financing Receivable, Modifications [Line Items]          
Financing receivable, modifications, number of loans 6,759 7,165 19,699 19,374  
Financing receivable, modifications, pre-modification gross carrying value $ 67 $ 80 $ 302 $ 298  
Financing receivable, modifications, post-modification gross carrying value $ 67 $ 75 $ 270 $ 262  
Consumer portfolio segment | Residential mortgage          
Financing Receivable, Modifications [Line Items]          
Financing receivable, modifications, number of loans 75 39 172 112  
Financing receivable, modifications, pre-modification gross carrying value $ 12 $ 4 $ 31 $ 19  
Financing receivable, modifications, post-modification gross carrying value $ 10 $ 4 $ 29 $ 18  
Consumer portfolio segment | Mortgage Finance          
Financing Receivable, Modifications [Line Items]          
Financing receivable, modifications, number of loans 10 2 18 3  
Financing receivable, modifications, pre-modification gross carrying value $ 4 $ 0 $ 7 $ 0  
Financing receivable, modifications, post-modification gross carrying value $ 4 $ 0 $ 7 $ 0  
Consumer portfolio segment | Mortgage - Legacy          
Financing Receivable, Modifications [Line Items]          
Financing receivable, modifications, number of loans 65 37 154 109  
Financing receivable, modifications, pre-modification gross carrying value $ 8 $ 4 $ 24 $ 19  
Financing receivable, modifications, post-modification gross carrying value $ 6 $ 4 $ 22 $ 18  
Commercial portfolio segment | Commercial loan          
Financing Receivable, Modifications [Line Items]          
Financing receivable, modifications, number of loans 0 4 5 6  
Financing receivable, modifications, pre-modification gross carrying value $ 0 $ 16 $ 59 $ 60  
Financing receivable, modifications, post-modification gross carrying value $ 0 $ 16 $ 55 $ 60  
Commercial portfolio segment | Commercial and industrial other          
Financing Receivable, Modifications [Line Items]          
Financing receivable, modifications, number of loans     2 2  
Financing receivable, modifications, pre-modification gross carrying value     $ 55 $ 44  
Financing receivable, modifications, post-modification gross carrying value     $ 51 $ 44  
Commercial portfolio segment | Commercial and industrial automotive          
Financing Receivable, Modifications [Line Items]          
Financing receivable, modifications, number of loans 0 3 3 3  
Financing receivable, modifications, pre-modification gross carrying value $ 0 $ 13 $ 4 $ 13  
Financing receivable, modifications, post-modification gross carrying value $ 0 $ 13 $ 4 $ 13  
Commercial portfolio segment | Commercial real estate          
Financing Receivable, Modifications [Line Items]          
Financing receivable, modifications, number of loans 0 1 0 1  
Financing receivable, modifications, pre-modification gross carrying value $ 0 $ 3 $ 0 $ 3  
Financing receivable, modifications, post-modification gross carrying value $ 0 $ 3 $ 0 $ 3