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Finance Receivables and Loans, Net (Impaired Financing Receivables) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance $ 925 $ 756
Financing receivable, impaired, gross carrying value 898 733
Financing receivable, impaired, with no allowance 229 172
Financing receivable, impaired, with related allowance 669 561
Financing receivable, impaired, allowance for impaired loans 102 77
Consumer portfolio segment | Consumer loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 728 674
Financing receivable, impaired, gross carrying value 714 661
Financing receivable, impaired, with no allowance 176 153
Financing receivable, impaired, with related allowance 538 508
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 492 438
Financing receivable, impaired, gross carrying value 483 430
Financing receivable, impaired, with no allowance 108 91
Financing receivable, impaired, with related allowance 375 339
Financing receivable, impaired, allowance for impaired loans 43 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 68 62
Financing receivable, impaired, with related allowance 163 169
Financing receivable, impaired, allowance for impaired loans 24 27
Consumer portfolio segment | Mortgage Finance    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 14 8
Financing receivable, impaired, gross carrying value 14 8
Financing receivable, impaired, with no allowance 5 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 222 228
Financing receivable, impaired, gross carrying value 217 223
Financing receivable, impaired, with no allowance 63 58
Financing receivable, impaired, with related allowance 154 165
Financing receivable, impaired, allowance for impaired loans 23 27
Commercial portfolio segment | Commercial loan    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 197 82
Financing receivable, impaired, gross carrying value 184 72
Financing receivable, impaired, with no allowance 53 19
Financing receivable, impaired, with related allowance 131 53
Financing receivable, impaired, allowance for impaired loans 35 14
Commercial portfolio segment | Commercial and industrial automotive    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 78 27
Financing receivable, impaired, gross carrying value 78 27
Financing receivable, impaired, with no allowance 8 9
Financing receivable, impaired, with related allowance 70 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 112 54
Financing receivable, impaired, gross carrying value 99 44
Financing receivable, impaired, with no allowance 40 10
Financing receivable, impaired, with related allowance 59 34
Financing receivable, impaired, allowance for impaired loans 25 11
Commercial portfolio segment | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Financing receivable, impaired, unpaid principal balance 7 1
Financing receivable, impaired, gross carrying value 7 1
Financing receivable, impaired, with no allowance 5 0
Financing receivable, impaired, with related allowance 2 1
Financing receivable, impaired, allowance for impaired loans $ 0 $ 0