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Finance Receivables and Loans, Net (Impaired Financing Receivables) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance $ 948 $ 1,105
Financing receivable, impaired, gross carrying value 912 1,075
Financing receivable, impaired, with no allowance 251 332
Financing receivable, impaired, with related allowance 661 743
Financing receivable, impaired, allowance for impaired loans 111 123
Consumer portfolio segment    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 731 739
Financing receivable, impaired, gross carrying value 716 726
Financing receivable, impaired, with no allowance 172 176
Financing receivable, impaired, with related allowance 544 550
Financing receivable, impaired, allowance for impaired loans 62 67
Consumer portfolio segment | Automotive loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 506 503
Financing receivable, impaired, gross carrying value 496 495
Financing receivable, impaired, with no allowance 101 105
Financing receivable, impaired, with related allowance 395 390
Financing receivable, impaired, allowance for impaired loans 42 44
Consumer portfolio segment | Real estate-backed loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 225 236
Financing receivable, impaired, gross carrying value 220 231
Financing receivable, impaired, with no allowance 71 71
Financing receivable, impaired, with related allowance 149 160
Financing receivable, impaired, allowance for impaired loans 20 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 211 221
Financing receivable, impaired, gross carrying value 206 216
Financing receivable, impaired, with no allowance 65 65
Financing receivable, impaired, with related allowance 141 151
Financing receivable, impaired, allowance for impaired loans 20 22
Commercial portfolio segment    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 217 366
Financing receivable, impaired, gross carrying value 196 349
Financing receivable, impaired, with no allowance 79 156
Financing receivable, impaired, with related allowance 117 193
Financing receivable, impaired, allowance for impaired loans 49 56
Commercial portfolio segment | Automotive loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 89 203
Financing receivable, impaired, gross carrying value 89 203
Financing receivable, impaired, with no allowance 18 112
Financing receivable, impaired, with related allowance 71 91
Financing receivable, impaired, allowance for impaired loans 19 10
Commercial portfolio segment | Real estate-backed loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 6 4
Financing receivable, impaired, gross carrying value 6 4
Financing receivable, impaired, with no allowance 6 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 122 159
Financing receivable, impaired, gross carrying value 101 142
Financing receivable, impaired, with no allowance 55 40
Financing receivable, impaired, with related allowance 46 102
Financing receivable, impaired, allowance for impaired loans $ 30 $ 46