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Finance Receivables and Loans, Net (Impaired Financing Receivables) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance $ 934 $ 756
Impaired Financing Receivable, Recorded Investment 906 733
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 244 172
Impaired Financing Receivable, with Related Allowance, Recorded Investment 662 561
Impaired Financing Receivable, Related Allowance 93 77
Consumer Portfolio Segment [Member] | Consumer Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 724 674
Impaired Financing Receivable, Recorded Investment 708 661
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 184 153
Impaired Financing Receivable, with Related Allowance, Recorded Investment 524 508
Impaired Financing Receivable, Related Allowance 66 63
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 491 438
Impaired Financing Receivable, Recorded Investment 480 430
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 117 91
Impaired Financing Receivable, with Related Allowance, Recorded Investment 363 339
Impaired Financing Receivable, Related Allowance 42 36
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 233 236
Impaired Financing Receivable, Recorded Investment 228 231
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 67 62
Impaired Financing Receivable, with Related Allowance, Recorded Investment 161 169
Impaired Financing Receivable, Related Allowance 24 27
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 10 8
Impaired Financing Receivable, Recorded Investment 10 8
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 4 4
Impaired Financing Receivable, with Related Allowance, Recorded Investment 6 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 223 228
Impaired Financing Receivable, Recorded Investment 218 223
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 63 58
Impaired Financing Receivable, with Related Allowance, Recorded Investment 155 165
Impaired Financing Receivable, Related Allowance 24 27
Commercial Portfolio Segment [Member] | Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 210 82
Impaired Financing Receivable, Recorded Investment 198 72
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 60 19
Impaired Financing Receivable, with Related Allowance, Recorded Investment 138 53
Impaired Financing Receivable, Related Allowance 27 14
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 88 27
Impaired Financing Receivable, Recorded Investment 88 27
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 16 9
Impaired Financing Receivable, with Related Allowance, Recorded Investment 72 18
Impaired Financing Receivable, Related Allowance 12 3
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 116 54
Impaired Financing Receivable, Recorded Investment 104 44
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 40 10
Impaired Financing Receivable, with Related Allowance, Recorded Investment 64 34
Impaired Financing Receivable, Related Allowance 15 11
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 6 1
Impaired Financing Receivable, Recorded Investment 6 1
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 4 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 2 1
Impaired Financing Receivable, Related Allowance $ 0 $ 0