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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Amortized Cost Basis by Credit Quality Indicator (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Total $ 145,959 $ 156,662  
Gross charge-offs      
Total 757 434 $ 539
Commercial      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 5,669 14,715  
Year two 13,841 15,843  
Year three 12,883 6,633  
Year four 4,966 6,280  
Year five 4,476 4,245  
Prior to year five 8,133 7,076  
Within the Revolving Period 24,399 27,221  
Converted to Term 78 167  
Total 74,445 82,180  
Gross charge-offs      
Year one 1    
Year two 3    
Year three 34    
Year four 60    
Year five 14    
Prior to year five 129    
Within the Revolving Period 44    
Converted to Term 0    
Total 285 70 218
Commercial | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 5,600 14,334  
Year two 12,303 15,274  
Year three 11,393 6,113  
Year four 4,000 5,239  
Year five 3,441 3,607  
Prior to year five 6,194 5,833  
Within the Revolving Period 23,008 26,099  
Converted to Term 61 151  
Total 66,000 76,650  
Commercial | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 59 129  
Year two 934 313  
Year three 894 225  
Year four 252 470  
Year five 233 148  
Prior to year five 373 269  
Within the Revolving Period 443 426  
Converted to Term 0 0  
Total 3,188 1,980  
Commercial | Substandard Accrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 8 239  
Year two 466 229  
Year three 540 272  
Year four 687 505  
Year five 653 443  
Prior to year five 1,226 921  
Within the Revolving Period 892 577  
Converted to Term 11 12  
Total 4,483 3,198  
Commercial | Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 2 13  
Year two 138 27  
Year three 56 23  
Year four 27 66  
Year five 149 47  
Prior to year five 340 53  
Within the Revolving Period 56 119  
Converted to Term 6 4  
Total 774 352  
Commercial | Commercial and industrial      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 3,664 8,588  
Year two 6,779 8,890  
Year three 5,779 2,548  
Year four 1,499 2,408  
Year five 1,259 1,522  
Prior to year five 2,530 2,468  
Within the Revolving Period 22,246 25,248  
Converted to Term 70 164  
Total 43,826 51,836  
Gross charge-offs      
Year one 1    
Year two 3    
Year three 34    
Year four 4    
Year five 1    
Prior to year five 34    
Within the Revolving Period 44    
Converted to Term 0    
Total 121    
Commercial | Commercial and industrial | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 3,599 8,304  
Year two 6,338 8,469  
Year three 5,049 2,224  
Year four 1,254 2,074  
Year five 1,085 1,334  
Prior to year five 2,031 1,952  
Within the Revolving Period 21,033 24,211  
Converted to Term 53 148  
Total 40,442 48,716  
Commercial | Commercial and industrial | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 59 124  
Year two 194 189  
Year three 354 120  
Year four 29 74  
Year five 48 48  
Prior to year five 113 153  
Within the Revolving Period 368 364  
Converted to Term 0 0  
Total 1,165 1,072  
Commercial | Commercial and industrial | Substandard Accrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 5 148  
Year two 175 210  
Year three 325 194  
Year four 212 254  
Year five 121 97  
Prior to year five 284 330  
Within the Revolving Period 792 554  
Converted to Term 11 12  
Total 1,925 1,799  
Commercial | Commercial and industrial | Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 1 12  
Year two 72 22  
Year three 51 10  
Year four 4 6  
Year five 5 43  
Prior to year five 102 33  
Within the Revolving Period 53 119  
Converted to Term 6 4  
Total 294 249  
Commercial | Commercial real estate      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 1,907 5,860  
Year two 6,847 6,581  
Year three 6,806 3,830  
Year four 3,269 3,764  
Year five 3,149 2,594  
Prior to year five 5,332 4,260  
Within the Revolving Period 2,153 1,973  
Converted to Term 8 3  
Total 29,471 28,865  
Gross charge-offs      
Year one 0    
Year two 0    
Year three 0    
Year four 56    
Year five 13    
Prior to year five 95    
Within the Revolving Period 0    
Converted to Term 0    
Total 164    
Commercial | Commercial real estate | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 1,906 5,767  
Year two 5,791 6,442  
Year three 6,062 3,639  
Year four 2,555 3,066  
Year five 2,294 2,145  
Prior to year five 3,895 3,536  
Within the Revolving Period 1,975 1,888  
Converted to Term 8 3  
Total 24,486 26,486  
Commercial | Commercial real estate | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 0 1  
Year two 713 119  
Year three 539 103  
Year four 222 390  
Year five 183 99  
Prior to year five 260 113  
Within the Revolving Period 75 62  
Converted to Term 0 0  
Total 1,992 887  
Commercial | Commercial real estate | Substandard Accrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 0 91  
Year two 277 15  
Year three 203 75  
Year four 469 248  
Year five 528 346  
Prior to year five 939 591  
Within the Revolving Period 100 23  
Converted to Term 0 0  
Total 2,516 1,389  
Commercial | Commercial real estate | Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 1 1  
Year two 66 5  
Year three 2 13  
Year four 23 60  
Year five 144 4  
Prior to year five 238 20  
Within the Revolving Period 3 0  
Converted to Term 0 0  
Total 477 103  
Commercial | Leases      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 98 267  
Year two 215 372  
Year three 298 255  
Year four 198 108  
Year five 68 129  
Prior to year five 271 348  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 1,148 1,479  
Gross charge-offs      
Year one 0    
Year two 0    
Year three 0    
Year four 0    
Year five 0    
Prior to year five 0    
Within the Revolving Period 0    
Converted to Term 0    
Total 0    
Commercial | Leases | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 95 263  
Year two 174 363  
Year three 282 250  
Year four 191 99  
Year five 62 128  
Prior to year five 268 345  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 1,072 1,448  
Commercial | Leases | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 0 4  
Year two 27 5  
Year three 1 2  
Year four 1 6  
Year five 2 1  
Prior to year five 0 3  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 31 21  
Commercial | Leases | Substandard Accrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 3 0  
Year two 14 4  
Year three 12 3  
Year four 6 3  
Year five 4 0  
Prior to year five 3 0  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 42 10  
Commercial | Leases | Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 0 0  
Year two 0 0  
Year three 3 0  
Year four 0 0  
Year five 0 0  
Prior to year five 0 0  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 3 0  
Retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 4,817 11,158  
Year two 10,219 18,251  
Year three 15,492 11,083  
Year four 9,169 5,223  
Year five 4,095 2,457  
Prior to year five 9,675 9,401  
Within the Revolving Period 17,008 15,803  
Converted to Term 1,039 1,106  
Total 71,514 74,482  
Gross charge-offs      
Year one 52    
Year two 63    
Year three 68    
Year four 48    
Year five 41    
Prior to year five 70    
Within the Revolving Period 129    
Converted to Term 1    
Total 472 364 $ 321
Retail | Residential mortgages      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 2,653 5,421  
Year two 5,821 9,071  
Year three 8,761 5,519  
Year four 5,180 2,432  
Year five 2,274 1,017  
Prior to year five 6,643 6,461  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 31,332 29,921  
Gross charge-offs      
Year one 0    
Year two 0    
Year three 0    
Year four 1    
Year five 1    
Prior to year five 4    
Within the Revolving Period 0    
Converted to Term 0    
Total 6    
Retail | Home equity      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 1 7  
Year two 9 9  
Year three 9 8  
Year four 7 36  
Year five 30 57  
Prior to year five 423 496  
Within the Revolving Period 13,529 12,340  
Converted to Term 1,032 1,090  
Total 15,040 14,043  
Gross charge-offs      
Year one 0    
Year two 0    
Year three 0    
Year four 0    
Year five 0    
Prior to year five 3    
Within the Revolving Period 8    
Converted to Term 1    
Total 12    
Retail | Automobile      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 500 3,276  
Year two 2,335 5,141  
Year three 3,444 2,028  
Year four 1,207 1,160  
Year five 576 474  
Prior to year five 196 213  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 8,258 12,292  
Gross charge-offs      
Year one 3    
Year two 34    
Year three 41    
Year four 14    
Year five 12    
Prior to year five 9    
Within the Revolving Period 0    
Converted to Term 0    
Total 113    
Retail | Education      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 852 1,712  
Year two 1,737 3,586  
Year three 3,114 3,131  
Year four 2,622 1,400  
Year five 1,150 820  
Prior to year five 2,359 2,159  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 11,834 12,808  
Gross charge-offs      
Year one 0    
Year two 5    
Year three 19    
Year four 25    
Year five 17    
Prior to year five 45    
Within the Revolving Period 0    
Converted to Term 0    
Total 111    
Retail | Other retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 811 742  
Year two 317 444  
Year three 164 397  
Year four 153 195  
Year five 65 89  
Prior to year five 54 72  
Within the Revolving Period 3,479 3,463  
Converted to Term 7 16  
Total 5,050 5,418  
Gross charge-offs      
Year one 49    
Year two 24    
Year three 8    
Year four 8    
Year five 11    
Prior to year five 9    
Within the Revolving Period 121    
Converted to Term 0    
Total 230    
Greater than 800 | Retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 1,449 3,516  
Year two 4,351 8,226  
Year three 7,913 5,389  
Year four 4,939 2,251  
Year five 1,913 924  
Prior to year five 4,466 4,340  
Within the Revolving Period 5,578 5,449  
Converted to Term 222 267  
Total 30,831 30,362  
Greater than 800 | Retail | Residential mortgages      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 889 2,132  
Year two 3,067 4,943  
Year three 5,172 3,143  
Year four 3,117 1,180  
Year five 1,131 363  
Prior to year five 3,125 3,081  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 16,501 14,842  
Greater than 800 | Retail | Home equity      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 0 4  
Year two 4 5  
Year three 4 2  
Year four 1 5  
Year five 4 6  
Prior to year five 91 110  
Within the Revolving Period 5,078 4,958  
Converted to Term 222 267  
Total 5,404 5,357  
Greater than 800 | Retail | Automobile      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 81 650  
Year two 539 1,453  
Year three 1,062 584  
Year four 368 324  
Year five 162 120  
Prior to year five 47 54  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 2,259 3,185  
Greater than 800 | Retail | Education      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 296 548  
Year two 671 1,720  
Year three 1,637 1,567  
Year four 1,418 694  
Year five 600 410  
Prior to year five 1,185 1,068  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 5,807 6,007  
Greater than 800 | Retail | Other retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 183 182  
Year two 70 105  
Year three 38 93  
Year four 35 48  
Year five 16 25  
Prior to year five 18 27  
Within the Revolving Period 500 491  
Converted to Term 0 0  
Total 860 971  
740-799 | Retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 2,093 4,305  
Year two 3,393 6,084  
Year three 4,696 3,557  
Year four 2,682 1,539  
Year five 1,150 695  
Prior to year five 2,456 2,422  
Within the Revolving Period 5,671 5,324  
Converted to Term 242 275  
Total 22,383 24,201  
740-799 | Retail | Residential mortgages      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 1,333 2,376  
Year two 1,940 2,991  
Year three 2,560 1,660  
Year four 1,411 638  
Year five 592 257  
Prior to year five 1,625 1,635  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 9,461 9,557  
740-799 | Retail | Home equity      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 0 2  
Year two 1 2  
Year three 2 1  
Year four 1 4  
Year five 3 6  
Prior to year five 82 97  
Within the Revolving Period 4,708 4,350  
Converted to Term 241 274  
Total 5,038 4,736  
740-799 | Retail | Automobile      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 134 962  
Year two 671 1,606  
Year three 1,038 649  
Year four 375 343  
Year five 165 134  
Prior to year five 52 56  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 2,435 3,750  
740-799 | Retail | Education      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 368 735  
Year two 694 1,351  
Year three 1,050 1,126  
Year four 850 486  
Year five 369 267  
Prior to year five 678 609  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 4,009 4,574  
740-799 | Retail | Other retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 258 230  
Year two 87 134  
Year three 46 121  
Year four 45 68  
Year five 21 31  
Prior to year five 19 25  
Within the Revolving Period 963 974  
Converted to Term 1 1  
Total 1,440 1,584  
680-739 | Retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 872 2,228  
Year two 1,574 2,619  
Year three 1,839 1,422  
Year four 1,032 790  
Year five 541 386  
Prior to year five 1,314 1,311  
Within the Revolving Period 3,666 3,289  
Converted to Term 204 238  
Total 11,042 12,283  
680-739 | Retail | Residential mortgages      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 367 769  
Year two 631 899  
Year three 758 502  
Year four 466 308  
Year five 266 149  
Prior to year five 873 851  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 3,361 3,478  
680-739 | Retail | Home equity      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 1 1  
Year two 1 1  
Year three 1 1  
Year four 2 6  
Year five 5 11  
Prior to year five 93 114  
Within the Revolving Period 2,693 2,296  
Converted to Term 202 234  
Total 2,998 2,664  
680-739 | Retail | Automobile      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 147 920  
Year two 577 1,187  
Year three 708 460  
Year four 252 254  
Year five 118 102  
Prior to year five 39 44  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 1,841 2,967  
680-739 | Retail | Education      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 143 363  
Year two 289 423  
Year three 333 356  
Year four 273 170  
Year five 134 103  
Prior to year five 298 288  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 1,470 1,703  
680-739 | Retail | Other retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 214 175  
Year two 76 109  
Year three 39 103  
Year four 39 52  
Year five 18 21  
Prior to year five 11 14  
Within the Revolving Period 973 993  
Converted to Term 2 4  
Total 1,372 1,471  
620-679 | Retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 296 841  
Year two 565 896  
Year three 602 456  
Year four 281 336  
Year five 232 214  
Prior to year five 659 649  
Within the Revolving Period 1,137 993  
Converted to Term 139 147  
Total 3,911 4,532  
620-679 | Retail | Residential mortgages      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 54 125  
Year two 135 168  
Year three 165 135  
Year four 90 138  
Year five 121 99  
Prior to year five 445 422  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 1,010 1,087  
620-679 | Retail | Home equity      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 0 0  
Year two 1 1  
Year three 1 2  
Year four 2 9  
Year five 8 16  
Prior to year five 77 93  
Within the Revolving Period 718 558  
Converted to Term 137 143  
Total 944 822  
620-679 | Retail | Automobile      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 94 554  
Year two 316 586  
Year three 345 205  
Year four 112 133  
Year five 65 62  
Prior to year five 26 28  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 958 1,568  
620-679 | Retail | Education      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 30 54  
Year two 65 76  
Year three 68 62  
Year four 58 38  
Year five 32 29  
Prior to year five 107 102  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 360 361  
620-679 | Retail | Other retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 118 108  
Year two 48 65  
Year three 23 52  
Year four 19 18  
Year five 6 8  
Prior to year five 4 4  
Within the Revolving Period 419 435  
Converted to Term 2 4  
Total 639 694  
Less than 620 | Retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 89 246  
Year two 335 423  
Year three 439 254  
Year four 233 304  
Year five 256 236  
Prior to year five 730 620  
Within the Revolving Period 583 368  
Converted to Term 232 178  
Total 2,897 2,629  
Less than 620 | Retail | Residential mortgages      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 9 17  
Year two 48 68  
Year three 104 77  
Year four 95 165  
Year five 161 147  
Prior to year five 561 455  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 978 929  
Less than 620 | Retail | Home equity      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 0 0  
Year two 2 0  
Year three 1 2  
Year four 1 12  
Year five 10 18  
Prior to year five 80 82  
Within the Revolving Period 332 178  
Converted to Term 230 172  
Total 656 464  
Less than 620 | Retail | Automobile      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 44 188  
Year two 232 309  
Year three 291 130  
Year four 100 106  
Year five 66 56  
Prior to year five 32 31  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 765 820  
Less than 620 | Retail | Education      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 5 6  
Year two 18 16  
Year three 25 20  
Year four 23 12  
Year five 15 11  
Prior to year five 55 50  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 141 115  
Less than 620 | Retail | Other retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 31 35  
Year two 35 30  
Year three 18 25  
Year four 14 9  
Year five 4 4  
Prior to year five 2 2  
Within the Revolving Period 251 190  
Converted to Term 2 6  
Total 357 301  
No FICO available | Retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 18 22  
Year two 1 3  
Year three 3 5  
Year four 2 3  
Year five 3 2  
Prior to year five 50 59  
Within the Revolving Period 373 380  
Converted to Term 0 1  
Total 450 475  
No FICO available | Retail | Residential mortgages      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 1 2  
Year two 0 2  
Year three 2 2  
Year four 1 3  
Year five 3 2  
Prior to year five 14 17  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 21 28  
No FICO available | Retail | Automobile      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 0 2  
Year two 0 0  
Year three 0 0  
Year four 0 0  
Year five 0 0  
Prior to year five 0 0  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 0 2  
No FICO available | Retail | Education      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 10 6  
Year two 0 0  
Year three 1 0  
Year four 0 0  
Year five 0 0  
Prior to year five 36 42  
Within the Revolving Period 0 0  
Converted to Term 0 0  
Total 47 48  
No FICO available | Retail | Other retail      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Year one 7 12  
Year two 1 1  
Year three 0 3  
Year four 1 0  
Year five 0 0  
Prior to year five 0 0  
Within the Revolving Period 373 380  
Converted to Term 0 1  
Total $ 382 $ 397