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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Amortized Cost Basis by Credit Quality Indicator (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total $ 141,632   $ 141,632   $ 145,959
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     25 $ 36  
Year two     17 50  
Year three     52 82  
Year four     97 88  
Year five     129 40  
Prior to year five     182 130  
Within the Revolving Period     181 125  
Converted to Term     2 0  
Total 231 $ 191 685 551  
Commercial          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 5,756   5,756   5,669
Year two 4,396   4,396   13,841
Year three 12,394   12,394   12,883
Year four 10,681   10,681   4,966
Year five 3,974   3,974   4,476
Prior to year five 9,592   9,592   8,133
Within the Revolving Period 24,916   24,916   24,399
Converted to Term 99   99   78
Total 71,808   71,808   74,445
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0 0  
Year two     0 1  
Year three     16 32  
Year four     44 55  
Year five     99 12  
Prior to year five     117 77  
Within the Revolving Period     32 35  
Converted to Term     0 0  
Total 106 74 308 212  
Commercial | Pass          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 5,746   5,746   5,600
Year two 4,236   4,236   12,303
Year three 10,551   10,551   11,393
Year four 9,236   9,236   4,000
Year five 3,085   3,085   3,441
Prior to year five 6,956   6,956   6,194
Within the Revolving Period 23,342   23,342   23,008
Converted to Term 75   75   61
Total 63,227   63,227   66,000
Commercial | Special Mention          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 7   7   59
Year two 71   71   934
Year three 1,117   1,117   894
Year four 699   699   252
Year five 187   187   233
Prior to year five 523   523   373
Within the Revolving Period 439   439   443
Converted to Term 0   0   0
Total 3,043   3,043   3,188
Commercial | Substandard Accrual          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 3   3   8
Year two 66   66   466
Year three 585   585   540
Year four 691   691   687
Year five 606   606   653
Prior to year five 1,413   1,413   1,226
Within the Revolving Period 1,085   1,085   892
Converted to Term 18   18   11
Total 4,467   4,467   4,483
Commercial | Nonaccrual          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   2
Year two 23   23   138
Year three 141   141   56
Year four 55   55   27
Year five 96   96   149
Prior to year five 700   700   340
Within the Revolving Period 50   50   56
Converted to Term 6   6   6
Total 1,071   1,071   774
Commercial | Commercial and industrial          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 4,156   4,156   3,762
Year two 3,064   3,064   6,994
Year three 5,274   5,274   6,077
Year four 4,062   4,062   1,697
Year five 1,278   1,278   1,327
Prior to year five 2,661   2,661   2,801
Within the Revolving Period 23,239   23,239   22,246
Converted to Term 91   91   70
Total 43,825   43,825   44,974
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0 0  
Year two     0 1  
Year three     15 32  
Year four     22 4  
Year five     1 1  
Prior to year five     15 24  
Within the Revolving Period     32 35  
Converted to Term     0 0  
Total     85 97  
Commercial | Commercial and industrial | Pass          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 4,147   4,147   3,694
Year two 2,910   2,910   6,512
Year three 4,856   4,856   5,331
Year four 3,430   3,430   1,445
Year five 1,095   1,095   1,147
Prior to year five 2,266   2,266   2,299
Within the Revolving Period 21,931   21,931   21,033
Converted to Term 71   71   53
Total 40,706   40,706   41,514
Commercial | Commercial and industrial | Special Mention          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 6   6   59
Year two 71   71   221
Year three 104   104   355
Year four 271   271   30
Year five 27   27   50
Prior to year five 38   38   113
Within the Revolving Period 310   310   368
Converted to Term 0   0   0
Total 827   827   1,196
Commercial | Commercial and industrial | Substandard Accrual          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 3   3   8
Year two 60   60   189
Year three 259   259   337
Year four 344   344   218
Year five 151   151   125
Prior to year five 292   292   287
Within the Revolving Period 950   950   792
Converted to Term 14   14   11
Total 2,073   2,073   1,967
Commercial | Commercial and industrial | Nonaccrual          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   1
Year two 23   23   72
Year three 55   55   54
Year four 17   17   4
Year five 5   5   5
Prior to year five 65   65   102
Within the Revolving Period 48   48   53
Converted to Term 6   6   6
Total 219   219   297
Commercial | Commercial real estate          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 1,600   1,600   1,907
Year two 1,332   1,332   6,847
Year three 7,120   7,120   6,806
Year four 6,619   6,619   3,269
Year five 2,696   2,696   3,149
Prior to year five 6,931   6,931   5,332
Within the Revolving Period 1,677   1,677   2,153
Converted to Term 8   8   8
Total 27,983   27,983   29,471
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0 0  
Year two     0 0  
Year three     1 0  
Year four     22 51  
Year five     98 11  
Prior to year five     102 53  
Within the Revolving Period     0 0  
Converted to Term     0 0  
Total     223 115  
Commercial | Commercial real estate | Pass          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 1,599   1,599   1,906
Year two 1,326   1,326   5,791
Year three 5,695   5,695   6,062
Year four 5,806   5,806   2,555
Year five 1,990   1,990   2,294
Prior to year five 4,690   4,690   3,895
Within the Revolving Period 1,411   1,411   1,975
Converted to Term 4   4   8
Total 22,521   22,521   24,486
Commercial | Commercial real estate | Special Mention          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 1   1   0
Year two 0   0   713
Year three 1,013   1,013   539
Year four 428   428   222
Year five 160   160   183
Prior to year five 485   485   260
Within the Revolving Period 129   129   75
Converted to Term 0   0   0
Total 2,216   2,216   1,992
Commercial | Commercial real estate | Substandard Accrual          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 6   6   277
Year three 326   326   203
Year four 347   347   469
Year five 455   455   528
Prior to year five 1,121   1,121   939
Within the Revolving Period 135   135   100
Converted to Term 4   4   0
Total 2,394   2,394   2,516
Commercial | Commercial real estate | Nonaccrual          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   1
Year two 0   0   66
Year three 86   86   2
Year four 38   38   23
Year five 91   91   144
Prior to year five 635   635   238
Within the Revolving Period 2   2   3
Converted to Term 0   0   0
Total 852   852   477
Retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 3,688   3,688   4,817
Year two 4,434   4,434   10,219
Year three 9,236   9,236   15,492
Year four 13,689   13,689   9,169
Year five 8,019   8,019   4,095
Prior to year five 11,908   11,908   9,675
Within the Revolving Period 17,827   17,827   17,008
Converted to Term 1,023   1,023   1,039
Total 69,824   69,824   71,514
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     25 36  
Year two     17 49  
Year three     36 50  
Year four     53 33  
Year five     30 28  
Prior to year five     65 53  
Within the Revolving Period     149 90  
Converted to Term     2 0  
Total 125 $ 117 377 339  
Retail | Residential mortgages          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 2,488   2,488   2,653
Year two 2,609   2,609   5,821
Year three 5,709   5,709   8,761
Year four 8,445   8,445   5,180
Year five 4,931   4,931   2,274
Prior to year five 8,197   8,197   6,643
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 32,379   32,379   31,332
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0 0  
Year two     0 0  
Year three     0 0  
Year four     0 0  
Year five     0 1  
Prior to year five     4 2  
Within the Revolving Period     0 0  
Converted to Term     0 0  
Total     4 3  
Retail | Home equity          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 1   1   1
Year two 3   3   9
Year three 15   15   9
Year four 10   10   7
Year five 7   7   30
Prior to year five 359   359   423
Within the Revolving Period 14,578   14,578   13,529
Converted to Term 1,019   1,019   1,032
Total 15,992   15,992   15,040
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0 0  
Year two     0 0  
Year three     0 0  
Year four     0 0  
Year five     0 0  
Prior to year five     3 2  
Within the Revolving Period     8 6  
Converted to Term     1 0  
Total     12 8  
Retail | Automobile          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   500
Year two 382   382   2,335
Year three 1,729   1,729   3,444
Year four 2,371   2,371   1,207
Year five 730   730   576
Prior to year five 328   328   196
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 5,540   5,540   8,258
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0 0  
Year two     5 24  
Year three     23 31  
Year four     23 11  
Year five     7 9  
Prior to year five     4 7  
Within the Revolving Period     9 0  
Converted to Term     1 0  
Total     72 82  
Retail | Education          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 525   525   852
Year two 975   975   1,737
Year three 1,585   1,585   3,114
Year four 2,774   2,774   2,622
Year five 2,282   2,282   1,150
Prior to year five 2,977   2,977   2,359
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 11,118   11,118   11,834
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0 0  
Year two     2 3  
Year three     6 12  
Year four     18 16  
Year five     21 10  
Prior to year five     46 35  
Within the Revolving Period     0 0  
Converted to Term     0 0  
Total     93 76  
Retail | Other retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 674   674   811
Year two 465   465   317
Year three 198   198   164
Year four 89   89   153
Year five 69   69   65
Prior to year five 47   47   54
Within the Revolving Period 3,249   3,249   3,479
Converted to Term 4   4   7
Total 4,795   4,795   5,050
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     25 36  
Year two     10 22  
Year three     7 7  
Year four     12 6  
Year five     2 8  
Prior to year five     8 7  
Within the Revolving Period     132 84  
Converted to Term     0 0  
Total     196 $ 170  
Greater than 800 | Retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 1,219   1,219   1,449
Year two 1,848   1,848   4,351
Year three 4,405   4,405   7,913
Year four 7,510   7,510   4,939
Year five 4,496   4,496   1,913
Prior to year five 5,674   5,674   4,466
Within the Revolving Period 5,905   5,905   5,578
Converted to Term 204   204   222
Total 31,261   31,261   30,831
Greater than 800 | Retail | Residential mortgages          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 884   884   889
Year two 1,295   1,295   3,067
Year three 3,276   3,276   5,172
Year four 5,165   5,165   3,117
Year five 2,962   2,962   1,131
Prior to year five 3,952   3,952   3,125
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 17,534   17,534   16,501
Greater than 800 | Retail | Home equity          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 1   1   0
Year two 0   0   4
Year three 3   3   4
Year four 4   4   1
Year five 1   1   4
Prior to year five 80   80   91
Within the Revolving Period 5,414   5,414   5,078
Converted to Term 204   204   222
Total 5,707   5,707   5,404
Greater than 800 | Retail | Automobile          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   81
Year two 72   72   539
Year three 420   420   1,062
Year four 762   762   368
Year five 226   226   162
Prior to year five 84   84   47
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 1,564   1,564   2,259
Greater than 800 | Retail | Education          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 184   184   296
Year two 377   377   671
Year three 665   665   1,637
Year four 1,560   1,560   1,418
Year five 1,291   1,291   600
Prior to year five 1,544   1,544   1,185
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 5,621   5,621   5,807
Greater than 800 | Retail | Other retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 150   150   183
Year two 104   104   70
Year three 41   41   38
Year four 19   19   35
Year five 16   16   16
Prior to year five 14   14   18
Within the Revolving Period 491   491   500
Converted to Term 0   0   0
Total 835   835   860
740-799 | Retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 1,719   1,719   2,093
Year two 1,551   1,551   3,393
Year three 2,797   2,797   4,696
Year four 3,838   3,838   2,682
Year five 2,291   2,291   1,150
Prior to year five 3,040   3,040   2,456
Within the Revolving Period 6,009   6,009   5,671
Converted to Term 228   228   242
Total 21,473   21,473   22,383
740-799 | Retail | Residential mortgages          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 1,268   1,268   1,333
Year two 930   930   1,940
Year three 1,659   1,659   2,560
Year four 2,279   2,279   1,411
Year five 1,359   1,359   592
Prior to year five 2,009   2,009   1,625
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 9,504   9,504   9,461
740-799 | Retail | Home equity          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 0   0   1
Year three 2   2   2
Year four 2   2   1
Year five 1   1   3
Prior to year five 70   70   82
Within the Revolving Period 5,102   5,102   4,708
Converted to Term 227   227   241
Total 5,404   5,404   5,038
740-799 | Retail | Automobile          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   134
Year two 101   101   671
Year three 488   488   1,038
Year four 685   685   375
Year five 220   220   165
Prior to year five 88   88   52
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 1,582   1,582   2,435
740-799 | Retail | Education          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 223   223   368
Year two 379   379   694
Year three 598   598   1,050
Year four 850   850   850
Year five 691   691   369
Prior to year five 859   859   678
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 3,600   3,600   4,009
740-799 | Retail | Other retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 228   228   258
Year two 141   141   87
Year three 50   50   46
Year four 22   22   45
Year five 20   20   21
Prior to year five 14   14   19
Within the Revolving Period 907   907   963
Converted to Term 1   1   1
Total 1,383   1,383   1,440
680-739 | Retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 569   569   872
Year two 673   673   1,574
Year three 1,263   1,263   1,839
Year four 1,456   1,456   1,032
Year five 813   813   541
Prior to year five 1,500   1,500   1,314
Within the Revolving Period 3,772   3,772   3,666
Converted to Term 186   186   204
Total 10,232   10,232   11,042
680-739 | Retail | Residential mortgages          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 304   304   367
Year two 292   292   631
Year three 579   579   758
Year four 702   702   466
Year five 430   430   266
Prior to year five 988   988   873
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 3,295   3,295   3,361
680-739 | Retail | Home equity          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   1
Year two 0   0   1
Year three 1   1   1
Year four 0   0   2
Year five 2   2   5
Prior to year five 78   78   93
Within the Revolving Period 2,895   2,895   2,693
Converted to Term 185   185   202
Total 3,161   3,161   2,998
680-739 | Retail | Automobile          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   147
Year two 102   102   577
Year three 397   397   708
Year four 458   458   252
Year five 144   144   118
Prior to year five 65   65   39
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 1,166   1,166   1,841
680-739 | Retail | Education          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 84   84   143
Year two 159   159   289
Year three 243   243   333
Year four 276   276   273
Year five 222   222   134
Prior to year five 358   358   298
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 1,342   1,342   1,470
680-739 | Retail | Other retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 181   181   214
Year two 120   120   76
Year three 43   43   39
Year four 20   20   39
Year five 15   15   18
Prior to year five 11   11   11
Within the Revolving Period 877   877   973
Converted to Term 1   1   2
Total 1,268   1,268   1,372
620-679 | Retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 128   128   296
Year two 231   231   565
Year three 427   427   602
Year four 453   453   281
Year five 216   216   232
Prior to year five 736   736   659
Within the Revolving Period 1,088   1,088   1,137
Converted to Term 140   140   139
Total 3,419   3,419   3,911
620-679 | Retail | Residential mortgages          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 26   26   54
Year two 57   57   135
Year three 122   122   165
Year four 151   151   90
Year five 84   84   121
Prior to year five 506   506   445
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 946   946   1,010
620-679 | Retail | Home equity          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 1   1   1
Year three 4   4   1
Year four 1   1   2
Year five 2   2   8
Prior to year five 66   66   77
Within the Revolving Period 734   734   718
Converted to Term 139   139   137
Total 947   947   944
620-679 | Retail | Automobile          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   94
Year two 60   60   316
Year three 214   214   345
Year four 229   229   112
Year five 67   67   65
Prior to year five 40   40   26
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 610   610   958
620-679 | Retail | Education          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 19   19   30
Year two 48   48   65
Year three 58   58   68
Year four 60   60   58
Year five 54   54   32
Prior to year five 120   120   107
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 359   359   360
620-679 | Retail | Other retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 83   83   118
Year two 65   65   48
Year three 29   29   23
Year four 12   12   19
Year five 9   9   6
Prior to year five 4   4   4
Within the Revolving Period 354   354   419
Converted to Term 1   1   2
Total 557   557   639
Less than 620 | Retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 28   28   89
Year two 131   131   335
Year three 344   344   439
Year four 431   431   233
Year five 202   202   256
Prior to year five 911   911   730
Within the Revolving Period 669   669   583
Converted to Term 265   265   232
Total 2,981   2,981   2,897
Less than 620 | Retail | Residential mortgages          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 6   6   9
Year two 35   35   48
Year three 73   73   104
Year four 147   147   95
Year five 95   95   161
Prior to year five 726   726   561
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 1,082   1,082   978
Less than 620 | Retail | Home equity          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 2   2   2
Year three 5   5   1
Year four 3   3   1
Year five 1   1   10
Prior to year five 65   65   80
Within the Revolving Period 433   433   332
Converted to Term 264   264   230
Total 773   773   656
Less than 620 | Retail | Automobile          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   44
Year two 47   47   232
Year three 210   210   291
Year four 237   237   100
Year five 73   73   66
Prior to year five 51   51   32
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 618   618   765
Less than 620 | Retail | Education          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 3   3   5
Year two 12   12   18
Year three 21   21   25
Year four 28   28   23
Year five 24   24   15
Prior to year five 65   65   55
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 153   153   141
Less than 620 | Retail | Other retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 19   19   31
Year two 35   35   35
Year three 35   35   18
Year four 16   16   14
Year five 9   9   4
Prior to year five 4   4   2
Within the Revolving Period 236   236   251
Converted to Term 1   1   2
Total 355   355   357
No FICO available | Retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 25   25   18
Year two 0   0   1
Year three 0   0   3
Year four 1   1   2
Year five 1   1   3
Prior to year five 47   47   50
Within the Revolving Period 384   384   373
Converted to Term 0   0   0
Total 458   458   450
No FICO available | Retail | Residential mortgages          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   1
Year two 0   0   0
Year three 0   0   2
Year four 1   1   1
Year five 1   1   3
Prior to year five 16   16   14
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 18   18   21
No FICO available | Retail | Home equity          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior to year five 0   0   0
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 0   0   0
No FICO available | Retail | Automobile          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior to year five 0   0   0
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 0   0   0
No FICO available | Retail | Education          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 12   12   10
Year two 0   0   0
Year three 0   0   1
Year four 0   0   0
Year five 0   0   0
Prior to year five 31   31   36
Within the Revolving Period 0   0   0
Converted to Term 0   0   0
Total 43   43   47
No FICO available | Retail | Other retail          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 13   13   7
Year two 0   0   1
Year three 0   0   0
Year four 0   0   1
Year five 0   0   0
Prior to year five 0   0   0
Within the Revolving Period 384   384   373
Converted to Term 0   0   0
Total $ 397   $ 397   $ 382