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Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Financing Receivable, Modifications [Line Items]      
Financing receivable, modifications, gross carrying value $ 837   $ 812
Loans and leases receivable, impaired, commitment to lend $ 13   $ 4
Financing receivable, modifications, number of loans 7,454 7,105  
Financing receivable, modifications, pre-modification gross carrying value $ 173 $ 139  
Financing receivable, modifications, post-modification gross carrying value $ 155 $ 120  
Consumer portfolio segment | Consumer loan      
Financing Receivable, Modifications [Line Items]      
Financing receivable, modifications, number of loans 7,448 7,105  
Financing receivable, modifications, pre-modification gross carrying value $ 132 $ 139  
Financing receivable, modifications, post-modification gross carrying value $ 114 $ 120  
Consumer portfolio segment | Automobile loan      
Financing Receivable, Modifications [Line Items]      
Financing receivable, modifications, number of loans 7,427 7,042  
Financing receivable, modifications, pre-modification gross carrying value $ 129 $ 128  
Financing receivable, modifications, post-modification gross carrying value $ 111 $ 110  
Consumer portfolio segment | Residential mortgage      
Financing Receivable, Modifications [Line Items]      
Financing receivable, modifications, number of loans 21 63  
Financing receivable, modifications, pre-modification gross carrying value $ 3 $ 11  
Financing receivable, modifications, post-modification gross carrying value $ 3 $ 10  
Consumer portfolio segment | Mortgage Finance      
Financing Receivable, Modifications [Line Items]      
Financing receivable, modifications, number of loans 1 1  
Financing receivable, modifications, pre-modification gross carrying value $ 0 $ 1  
Financing receivable, modifications, post-modification gross carrying value $ 0 $ 1  
Consumer portfolio segment | Mortgage - Legacy      
Financing Receivable, Modifications [Line Items]      
Financing receivable, modifications, number of loans 20 62  
Financing receivable, modifications, pre-modification gross carrying value $ 3 $ 10  
Financing receivable, modifications, post-modification gross carrying value $ 3 $ 9  
Commercial portfolio segment | Commercial and industrial automotive      
Financing Receivable, Modifications [Line Items]      
Financing receivable, modifications, number of loans 6 0  
Financing receivable, modifications, pre-modification gross carrying value $ 41 $ 0  
Financing receivable, modifications, post-modification gross carrying value $ 41 $ 0  
Commercial portfolio segment | Commercial loan      
Financing Receivable, Modifications [Line Items]      
Financing receivable, modifications, number of loans 6 0  
Financing receivable, modifications, pre-modification gross carrying value $ 41 $ 0  
Financing receivable, modifications, post-modification gross carrying value $ 41 $ 0