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Finance Receivables and Loans, Net (Impaired Financing Receivables) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance $ 1,013 $ 1,105
Financing receivable, impaired, gross carrying value 961 1,075
Financing receivable, impaired, with no allowance 261 332
Financing receivable, impaired, with related allowance 700 743
Financing receivable, impaired, allowance for impaired loans 89 123
Consumer portfolio segment    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 766 739
Financing receivable, impaired, gross carrying value 746 726
Financing receivable, impaired, with no allowance 183 176
Financing receivable, impaired, with related allowance 563 550
Financing receivable, impaired, allowance for impaired loans 56 67
Consumer portfolio segment | Automotive loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 553 503
Financing receivable, impaired, gross carrying value 538 495
Financing receivable, impaired, with no allowance 113 105
Financing receivable, impaired, with related allowance 425 390
Financing receivable, impaired, allowance for impaired loans 38 44
Consumer portfolio segment | Real estate-backed loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 213 236
Financing receivable, impaired, gross carrying value 208 231
Financing receivable, impaired, with no allowance 70 71
Financing receivable, impaired, with related allowance 138 160
Financing receivable, impaired, allowance for impaired loans 18 23
Consumer portfolio segment | Mortgage Finance operations    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 14 15
Financing receivable, impaired, gross carrying value 14 15
Financing receivable, impaired, with no allowance 6 6
Financing receivable, impaired, with related allowance 8 9
Financing receivable, impaired, allowance for impaired loans 0 1
Consumer portfolio segment | Mortgage - Legacy    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 199 221
Financing receivable, impaired, gross carrying value 194 216
Financing receivable, impaired, with no allowance 64 65
Financing receivable, impaired, with related allowance 130 151
Financing receivable, impaired, allowance for impaired loans 18 22
Commercial portfolio segment    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 247 366
Financing receivable, impaired, gross carrying value 215 349
Financing receivable, impaired, with no allowance 78 156
Financing receivable, impaired, with related allowance 137 193
Financing receivable, impaired, allowance for impaired loans 33 56
Commercial portfolio segment | Automotive loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 73 203
Financing receivable, impaired, gross carrying value 73 203
Financing receivable, impaired, with no allowance 1 112
Financing receivable, impaired, with related allowance 72 91
Financing receivable, impaired, allowance for impaired loans 12 10
Commercial portfolio segment | Real estate-backed loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 4 4
Financing receivable, impaired, gross carrying value 4 4
Financing receivable, impaired, with no allowance 4 4
Financing receivable, impaired, with related allowance 0 0
Financing receivable, impaired, allowance for impaired loans 0 0
Commercial portfolio segment | Other loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 170 159
Financing receivable, impaired, gross carrying value 138 142
Financing receivable, impaired, with no allowance 73 40
Financing receivable, impaired, with related allowance 65 102
Financing receivable, impaired, allowance for impaired loans $ 21 $ 46