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Finance Receivables and Loans, Net (Impaired Financing Receivables) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance $ 802 $ 795
Impaired Financing Receivable, Recorded Investment 773 739
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 201 199
Impaired Financing Receivable, with Related Allowance, Recorded Investment 572 540
Impaired Financing Receivable, Related Allowance 97 85
Consumer Portfolio Segment [Member] | Consumer Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 642 658
Impaired Financing Receivable, Recorded Investment 622 617
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 161 190
Impaired Financing Receivable, with Related Allowance, Recorded Investment 461 427
Impaired Financing Receivable, Related Allowance 65 62
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 396 407
Impaired Financing Receivable, Recorded Investment 380 370
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 102 131
Impaired Financing Receivable, with Related Allowance, Recorded Investment 278 239
Impaired Financing Receivable, Related Allowance 34 28
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 246 251
Impaired Financing Receivable, Recorded Investment 242 247
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 59 59
Impaired Financing Receivable, with Related Allowance, Recorded Investment 183 188
Impaired Financing Receivable, Related Allowance 31 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 238 243
Impaired Financing Receivable, Recorded Investment 234 239
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 55 56
Impaired Financing Receivable, with Related Allowance, Recorded Investment 179 183
Impaired Financing Receivable, Related Allowance 31 34
Commercial Portfolio Segment [Member] | Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 160 137
Impaired Financing Receivable, Recorded Investment 151 122
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 40 9
Impaired Financing Receivable, with Related Allowance, Recorded Investment 111 113
Impaired Financing Receivable, Related Allowance 32 23
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 75 33
Impaired Financing Receivable, Recorded Investment 75 33
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 27 7
Impaired Financing Receivable, with Related Allowance, Recorded Investment 48 26
Impaired Financing Receivable, Related Allowance 5 3
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 78 99
Impaired Financing Receivable, Recorded Investment 69 84
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 10 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 59 84
Impaired Financing Receivable, Related Allowance 26 19
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance 7 5
Impaired Financing Receivable, Recorded Investment 7 5
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 3 2
Impaired Financing Receivable, with Related Allowance, Recorded Investment 4 3
Impaired Financing Receivable, Related Allowance $ 1 $ 1