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Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Recorded Investment $ 742   $ 712
Loans and Leases Receivable, Impaired, Commitment to Lend $ 6   $ 6
Financing Receivable, Modifications, Number of Contracts 7,105 6,502  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 139 $ 150  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 120 $ 134  
Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 7,105 6,501  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 139 $ 127  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 120 $ 111  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 7,042 6,447  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 128 $ 115  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 110 $ 99  
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 63 54  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 11 $ 12  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 10 $ 12  
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 1 1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 1 $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 1 $ 0  
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 62 53  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 10 $ 12  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 9 $ 12  
Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 0 1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 23  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 23  
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 0 1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 23  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 23