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Finance Receivables and Loans, Net (Impaired Financing Receivables) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance $ 1,028 $ 1,105
Financing receivable, impaired, gross carrying value 997 1,075
Financing receivable, impaired, with no allowance 270 332
Financing receivable, impaired, with related allowance 727 743
Financing receivable, impaired, allowance for impaired loans 126 123
Consumer portfolio segment | Consumer loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 740 739
Financing receivable, impaired, gross carrying value 728 726
Financing receivable, impaired, with no allowance 170 176
Financing receivable, impaired, with related allowance 558 550
Financing receivable, impaired, allowance for impaired loans 68 67
Consumer portfolio segment | Automobile loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 509 503
Financing receivable, impaired, gross carrying value 501 495
Financing receivable, impaired, with no allowance 99 105
Financing receivable, impaired, with related allowance 402 390
Financing receivable, impaired, allowance for impaired loans 46 44
Consumer portfolio segment | Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 231 236
Financing receivable, impaired, gross carrying value 227 231
Financing receivable, impaired, with no allowance 71 71
Financing receivable, impaired, with related allowance 156 160
Financing receivable, impaired, allowance for impaired loans 22 23
Consumer portfolio segment | Mortgage Finance    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 15 15
Financing receivable, impaired, gross carrying value 15 15
Financing receivable, impaired, with no allowance 6 6
Financing receivable, impaired, with related allowance 9 9
Financing receivable, impaired, allowance for impaired loans 1 1
Consumer portfolio segment | Mortgage - Legacy    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 216 221
Financing receivable, impaired, gross carrying value 212 216
Financing receivable, impaired, with no allowance 65 65
Financing receivable, impaired, with related allowance 147 151
Financing receivable, impaired, allowance for impaired loans 21 22
Commercial portfolio segment | Commercial loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 288 366
Financing receivable, impaired, gross carrying value 269 349
Financing receivable, impaired, with no allowance 100 156
Financing receivable, impaired, with related allowance 169 193
Financing receivable, impaired, allowance for impaired loans 58 56
Commercial portfolio segment | Commercial and industrial automotive    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 138 203
Financing receivable, impaired, gross carrying value 138 203
Financing receivable, impaired, with no allowance 41 112
Financing receivable, impaired, with related allowance 97 91
Financing receivable, impaired, allowance for impaired loans 18 10
Commercial portfolio segment | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 144 159
Financing receivable, impaired, gross carrying value 125 142
Financing receivable, impaired, with no allowance 56 40
Financing receivable, impaired, with related allowance 69 102
Financing receivable, impaired, allowance for impaired loans 40 46
Commercial portfolio segment | Commercial real estate    
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 3 4
Financing receivable, impaired, with related allowance 3 0
Financing receivable, impaired, allowance for impaired loans $ 0 $ 0