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Finance Receivables and Loans, Net (Impaired Financing Receivables) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance $ 756 $ 795
Impaired Financing Receivable, Recorded Investment 733 739
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 172 199
Impaired Financing Receivable, with Related Allowance, Recorded Investment 561 540
Impaired Financing Receivable, Related Allowance 77 85
Consumer Portfolio Segment [Member] | Consumer Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 674 658
Impaired Financing Receivable, Recorded Investment 661 617
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 153 190
Impaired Financing Receivable, with Related Allowance, Recorded Investment 508 427
Impaired Financing Receivable, Related Allowance 63 62
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 438 407
Impaired Financing Receivable, Recorded Investment 430 370
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 91 131
Impaired Financing Receivable, with Related Allowance, Recorded Investment 339 239
Impaired Financing Receivable, Related Allowance 36 28
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 236 251
Impaired Financing Receivable, Recorded Investment 231 247
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 62 59
Impaired Financing Receivable, with Related Allowance, Recorded Investment 169 188
Impaired Financing Receivable, Related Allowance 27 34
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 8 8
Impaired Financing Receivable, Recorded Investment 8 8
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 4 3
Impaired Financing Receivable, with Related Allowance, Recorded Investment 4 5
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 228 243
Impaired Financing Receivable, Recorded Investment 223 239
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 58 56
Impaired Financing Receivable, with Related Allowance, Recorded Investment 165 183
Impaired Financing Receivable, Related Allowance 27 34
Commercial Portfolio Segment [Member] | Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 82 137
Impaired Financing Receivable, Recorded Investment 72 122
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 19 9
Impaired Financing Receivable, with Related Allowance, Recorded Investment 53 113
Impaired Financing Receivable, Related Allowance 14 23
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 27 33
Impaired Financing Receivable, Recorded Investment 27 33
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 9 7
Impaired Financing Receivable, with Related Allowance, Recorded Investment 18 26
Impaired Financing Receivable, Related Allowance 3 3
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 54 99
Impaired Financing Receivable, Recorded Investment 44 84
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 10 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 34 84
Impaired Financing Receivable, Related Allowance 11 19
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 1 5
Impaired Financing Receivable, Recorded Investment 1 5
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 2
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1 3
Impaired Financing Receivable, Related Allowance $ 0 $ 1