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Finance Receivables and Loans, Net (Impaired Financing Receivables) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance $ 1,105 $ 756
Financing receivable, impaired, gross carrying value 1,075 733
Financing receivable, impaired, with no allowance 332 172
Financing receivable, impaired, with related allowance 743 561
Financing receivable, impaired, allowance for impaired loans 123 77
Consumer portfolio segment | Consumer loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 739 674
Financing receivable, impaired, gross carrying value 726 661
Financing receivable, impaired, with no allowance 176 153
Financing receivable, impaired, with related allowance 550 508
Financing receivable, impaired, allowance for impaired loans 67 63
Consumer portfolio segment | Automobile loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 503 438
Financing receivable, impaired, gross carrying value 495 430
Financing receivable, impaired, with no allowance 105 91
Financing receivable, impaired, with related allowance 390 339
Financing receivable, impaired, allowance for impaired loans 44 36
Consumer portfolio segment | Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 236 236
Financing receivable, impaired, gross carrying value 231 231
Financing receivable, impaired, with no allowance 71 62
Financing receivable, impaired, with related allowance 160 169
Financing receivable, impaired, allowance for impaired loans 23 27
Consumer portfolio segment | Mortgage Finance    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 15 8
Financing receivable, impaired, gross carrying value 15 8
Financing receivable, impaired, with no allowance 6 4
Financing receivable, impaired, with related allowance 9 4
Financing receivable, impaired, allowance for impaired loans 1 0
Consumer portfolio segment | Mortgage - Legacy    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 221 228
Financing receivable, impaired, gross carrying value 216 223
Financing receivable, impaired, with no allowance 65 58
Financing receivable, impaired, with related allowance 151 165
Financing receivable, impaired, allowance for impaired loans 22 27
Commercial portfolio segment | Commercial loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 366 82
Financing receivable, impaired, gross carrying value 349 72
Financing receivable, impaired, with no allowance 156 19
Financing receivable, impaired, with related allowance 193 53
Financing receivable, impaired, allowance for impaired loans 56 14
Commercial portfolio segment | Commercial and industrial automotive    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 203 27
Financing receivable, impaired, gross carrying value 203 27
Financing receivable, impaired, with no allowance 112 9
Financing receivable, impaired, with related allowance 91 18
Financing receivable, impaired, allowance for impaired loans 10 3
Commercial portfolio segment | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 159 54
Financing receivable, impaired, gross carrying value 142 44
Financing receivable, impaired, with no allowance 40 10
Financing receivable, impaired, with related allowance 102 34
Financing receivable, impaired, allowance for impaired loans 46 11
Commercial portfolio segment | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 4 1
Financing receivable, impaired, gross carrying value 4 1
Financing receivable, impaired, with no allowance 4 0
Financing receivable, impaired, with related allowance 0 1
Financing receivable, impaired, allowance for impaired loans $ 0 $ 0