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Finance Receivables and Loans, Net (Impaired Financing Receivables) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance $ 866 $ 756
Impaired Financing Receivable, Recorded Investment 840 733
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 232 172
Impaired Financing Receivable, with Related Allowance, Recorded Investment 608 561
Impaired Financing Receivable, Related Allowance 88 77
Consumer Portfolio Segment [Member] | Consumer Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 708 674
Impaired Financing Receivable, Recorded Investment 693 661
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 172 153
Impaired Financing Receivable, with Related Allowance, Recorded Investment 521 508
Impaired Financing Receivable, Related Allowance 67 63
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 473 438
Impaired Financing Receivable, Recorded Investment 463 430
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 107 91
Impaired Financing Receivable, with Related Allowance, Recorded Investment 356 339
Impaired Financing Receivable, Related Allowance 40 36
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 235 236
Impaired Financing Receivable, Recorded Investment 230 231
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 65 62
Impaired Financing Receivable, with Related Allowance, Recorded Investment 165 169
Impaired Financing Receivable, Related Allowance 27 27
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 9 8
Impaired Financing Receivable, Recorded Investment 9 8
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 4 4
Impaired Financing Receivable, with Related Allowance, Recorded Investment 5 4
Impaired Financing Receivable, Related Allowance 0 0
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 226 228
Impaired Financing Receivable, Recorded Investment 221 223
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 61 58
Impaired Financing Receivable, with Related Allowance, Recorded Investment 160 165
Impaired Financing Receivable, Related Allowance 27 27
Commercial Portfolio Segment [Member] | Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 158 82
Impaired Financing Receivable, Recorded Investment 147 72
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 60 19
Impaired Financing Receivable, with Related Allowance, Recorded Investment 87 53
Impaired Financing Receivable, Related Allowance 21 14
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 68 27
Impaired Financing Receivable, Recorded Investment 68 27
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 15 9
Impaired Financing Receivable, with Related Allowance, Recorded Investment 53 18
Impaired Financing Receivable, Related Allowance 9 3
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 85 54
Impaired Financing Receivable, Recorded Investment 74 44
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 41 10
Impaired Financing Receivable, with Related Allowance, Recorded Investment 33 34
Impaired Financing Receivable, Related Allowance 11 11
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 5 1
Impaired Financing Receivable, Recorded Investment 5 1
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 4 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1 1
Impaired Financing Receivable, Related Allowance $ 1 $ 0