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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Amortized Cost Basis by Credit Quality Indicator (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 123,318 $ 123,090
SBA Guaranteed PPP Loans | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,900 4,200
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 7,915 10,683
2020 7,259 9,445
2019 9,463 7,862
2018 6,419 3,746
2017 3,146 2,200
Prior to 2017 5,005 3,998
Within the Revolving Period 18,587 22,459
Converted to Term 161 400
Total 57,955 60,793
Commercial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 7,768 10,339
2020 6,953 8,812
2019 8,749 7,219
2018 5,743 3,419
2017 2,665 1,903
Prior to 2017 4,327 3,572
Within the Revolving Period 17,540 20,552
Converted to Term 138 340
Total 53,883 56,156
Commercial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 52 56
2020 66 398
2019 376 286
2018 255 180
2017 229 156
Prior to 2017 349 239
Within the Revolving Period 451 1,071
Converted to Term 2 34
Total 1,780 2,420
Commercial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 69 207
2020 223 199
2019 326 315
2018 400 109
2017 241 138
Prior to 2017 309 153
Within the Revolving Period 559 749
Converted to Term 18 22
Total 2,145 1,892
Commercial | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 26 81
2020 17 36
2019 12 42
2018 21 38
2017 11 3
Prior to 2017 20 34
Within the Revolving Period 37 87
Converted to Term 3 4
Total 147 325
Commercial | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 6,481 8,226
2020 4,251 6,199
2019 5,190 4,625
2018 3,369 2,396
2017 1,880 1,301
Prior to 2017 2,906 2,311
Within the Revolving Period 17,616 18,715
Converted to Term 161 400
Total 41,854 44,173
Commercial | Commercial and industrial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 6,411 8,036
2020 4,086 5,730
2019 4,723 4,180
2018 3,079 2,174
2017 1,723 1,157
Prior to 2017 2,480 1,980
Within the Revolving Period 16,578 17,281
Converted to Term 138 340
Total 39,218 40,878
Commercial | Commercial and industrial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 4 34
2020 47 264
2019 226 163
2018 148 84
2017 55 60
Prior to 2017 182 173
Within the Revolving Period 451 771
Converted to Term 2 34
Total 1,115 1,583
Commercial | Commercial and industrial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 40 91
2020 110 195
2019 229 248
2018 121 100
2017 91 81
Prior to 2017 227 127
Within the Revolving Period 550 600
Converted to Term 18 22
Total 1,386 1,464
Commercial | Commercial and industrial | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 26 65
2020 8 10
2019 12 34
2018 21 38
2017 11 3
Prior to 2017 17 31
Within the Revolving Period 37 63
Converted to Term 3 4
Total 135 248
Commercial | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,147 1,999
2020 2,695 2,994
2019 4,074 3,004
2018 2,862 1,203
2017 1,182 713
Prior to 2017 1,577 995
Within the Revolving Period 971 3,744
Converted to Term 0 0
Total 14,508 14,652
Commercial | Commercial real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,073 1,848
2020 2,586 2,836
2019 3,835 2,810
2018 2,484 1,106
2017 863 566
Prior to 2017 1,343 919
Within the Revolving Period 962 3,271
Converted to Term 0 0
Total 13,146 13,356
Commercial | Commercial real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 46 19
2020 3 130
2019 148 121
2018 99 92
2017 169 94
Prior to 2017 151 48
Within the Revolving Period 0 300
Converted to Term 0 0
Total 616 804
Commercial | Commercial real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 28 116
2020 97 2
2019 91 65
2018 279 5
2017 150 53
Prior to 2017 81 26
Within the Revolving Period 9 149
Converted to Term 0 0
Total 735 416
Commercial | Commercial real estate | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 16
2020 9 26
2019 0 8
2018 0 0
2017 0 0
Prior to 2017 2 2
Within the Revolving Period 0 24
Converted to Term 0 0
Total 11 76
Commercial | Leases    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 287 458
2020 313 252
2019 199 233
2018 188 147
2017 84 186
Prior to 2017 522 692
Within the Revolving Period 0 0
Converted to Term 0 0
Total 1,593 1,968
Commercial | Leases | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 284 455
2020 281 246
2019 191 229
2018 180 139
2017 79 180
Prior to 2017 504 673
Within the Revolving Period 0 0
Converted to Term 0 0
Total 1,519 1,922
Commercial | Leases | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2 3
2020 16 4
2019 2 2
2018 8 4
2017 5 2
Prior to 2017 16 18
Within the Revolving Period 0 0
Converted to Term 0 0
Total 49 33
Commercial | Leases | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1 0
2020 16 2
2019 6 2
2018 0 4
2017 0 4
Prior to 2017 1 0
Within the Revolving Period 0 0
Converted to Term 0 0
Total 24 12
Commercial | Leases | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior to 2017 1 1
Within the Revolving Period 0 0
Converted to Term 0 0
Total 1 1
Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 13,746 17,242
2020 15,065 10,972
2019 7,905 5,335
2018 3,802 4,816
2017 3,486 4,462
Prior to 2017 7,909 6,323
Within the Revolving Period 12,233 11,755
Converted to Term 1,217 1,392
Total 65,363 62,297
Retail | Residential mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 4,925 6,512
2020 6,057 3,493
2019 2,948 1,278
2018 1,103 1,947
2017 1,630 2,770
Prior to 2017 4,850 3,539
Within the Revolving Period 0 0
Converted to Term 0 0
Total 21,513 19,539
Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1 6
2020 9 47
2019 48 75
2018 69 78
2017 69 50
Prior to 2017 661 833
Within the Revolving Period 9,834 9,692
Converted to Term 1,198 1,368
Total 11,889 12,149
Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 5,308 4,728
2020 3,610 3,449
2019 2,369 1,864
2018 1,181 1,232
2017 696 642
Prior to 2017 328 238
Within the Revolving Period 0 0
Converted to Term 0 0
Total 13,492 12,153
Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2,735 4,094
2020 4,202 2,706
2019 1,949 1,606
2018 1,163 1,333
2017 967 952
Prior to 2017 1,984 1,617
Within the Revolving Period 0 0
Converted to Term 0 0
Total 13,000 12,308
Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 777 1,902
2020 1,187 1,277
2019 591 512
2018 286 226
2017 124 48
Prior to 2017 86 96
Within the Revolving Period 2,399 2,063
Converted to Term 19 24
Total 5,469 6,148
Greater than 800 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 4,086 6,023
2020 6,231 4,448
2019 3,092 2,084
2018 1,332 2,306
2017 1,527 2,382
Prior to 2017 3,613 2,854
Within the Revolving Period 4,699 4,660
Converted to Term 294 344
Total 24,874 25,101
Greater than 800 | Retail | Residential mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,585 2,687
2020 3,179 1,885
2019 1,403 638
2018 395 1,129
2017 784 1,615
Prior to 2017 2,389 1,755
Within the Revolving Period 0 0
Converted to Term 0 0
Total 9,735 9,709
Greater than 800 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 2
2020 2 8
2019 6 10
2018 6 7
2017 4 5
Prior to 2017 154 216
Within the Revolving Period 4,333 4,319
Converted to Term 294 344
Total 4,799 4,911
Greater than 800 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,287 1,056
2020 897 812
2019 608 424
2018 286 312
2017 183 169
Prior to 2017 84 62
Within the Revolving Period 0 0
Converted to Term 0 0
Total 3,345 2,835
Greater than 800 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,080 1,817
2020 1,865 1,363
2019 921 849
2018 566 781
2017 519 578
Prior to 2017 951 777
Within the Revolving Period 0 0
Converted to Term 0 0
Total 5,902 6,165
Greater than 800 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 134 461
2020 288 380
2019 154 163
2018 79 77
2017 37 15
Prior to 2017 35 44
Within the Revolving Period 366 341
Converted to Term 0 0
Total 1,093 1,481
740-799 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 5,845 6,864
2020 5,403 3,630
2019 2,511 1,661
2018 1,119 1,345
2017 931 1,190
Prior to 2017 2,054 1,597
Within the Revolving Period 4,116 3,872
Converted to Term 301 333
Total 22,280 20,492
740-799 | Retail | Residential mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2,607 2,931
2020 2,087 1,133
2019 853 398
2018 265 527
2017 384 743
Prior to 2017 1,253 904
Within the Revolving Period 0 0
Converted to Term 0 0
Total 7,449 6,636
740-799 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1 2
2020 1 6
2019 5 7
2018 5 6
2017 8 5
Prior to 2017 137 180
Within the Revolving Period 3,405 3,234
Converted to Term 299 331
Total 3,861 3,771
740-799 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,781 1,514
2020 1,177 1,022
2019 707 531
2018 344 344
2017 195 172
Prior to 2017 85 59
Within the Revolving Period 0 0
Converted to Term 0 0
Total 4,289 3,642
740-799 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,245 1,797
2020 1,743 1,009
2019 730 541
2018 402 387
2017 297 251
Prior to 2017 550 423
Within the Revolving Period 0 0
Converted to Term 0 0
Total 4,967 4,408
740-799 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 211 620
2020 395 460
2019 216 184
2018 103 81
2017 47 19
Prior to 2017 29 31
Within the Revolving Period 711 638
Converted to Term 2 2
Total 1,714 2,035
680-739 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2,623 3,077
2020 2,406 1,842
2019 1,350 917
2018 682 644
2017 498 541
Prior to 2017 1,123 918
Within the Revolving Period 2,332 2,193
Converted to Term 255 289
Total 11,269 10,421
680-739 | Retail | Residential mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 639 784
2020 613 351
2019 356 162
2018 173 172
2017 185 295
Prior to 2017 611 458
Within the Revolving Period 0 0
Converted to Term 0 0
Total 2,577 2,222
680-739 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 1
2020 1 6
2019 8 10
2018 13 15
2017 17 8
Prior to 2017 151 179
Within the Revolving Period 1,665 1,632
Converted to Term 250 284
Total 2,105 2,135
680-739 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,436 1,347
2020 958 889
2019 589 461
2018 277 282
2017 154 138
Prior to 2017 69 47
Within the Revolving Period 0 0
Converted to Term 0 0
Total 3,483 3,164
680-739 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 369 450
2020 526 294
2019 246 173
2018 150 127
2017 113 90
Prior to 2017 278 221
Within the Revolving Period 0 0
Converted to Term 0 0
Total 1,682 1,355
680-739 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 179 495
2020 308 302
2019 151 111
2018 69 48
2017 29 10
Prior to 2017 14 13
Within the Revolving Period 667 561
Converted to Term 5 5
Total 1,422 1,545
620-679 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 907 1,040
2020 766 727
2019 571 391
2018 340 276
2017 256 192
Prior to 2017 584 491
Within the Revolving Period 609 576
Converted to Term 181 202
Total 4,214 3,895
620-679 | Retail | Residential mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 84 97
2020 117 94
2019 169 44
2018 103 56
2017 112 66
Prior to 2017 306 223
Within the Revolving Period 0 0
Converted to Term 0 0
Total 891 580
620-679 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 3 10
2019 13 18
2018 23 21
2017 19 14
Prior to 2017 123 136
Within the Revolving Period 345 402
Converted to Term 176 195
Total 702 796
620-679 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 680 669
2020 436 484
2019 297 259
2018 156 157
2017 89 84
Prior to 2017 45 32
Within the Revolving Period 0 0
Converted to Term 0 0
Total 1,703 1,685
620-679 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 29 26
2020 60 35
2019 41 33
2018 34 28
2017 28 25
Prior to 2017 105 95
Within the Revolving Period 0 0
Converted to Term 0 0
Total 297 242
620-679 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 114 248
2020 150 104
2019 51 37
2018 24 14
2017 8 3
Prior to 2017 5 5
Within the Revolving Period 264 174
Converted to Term 5 7
Total 621 592
Less than 620 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 149 179
2020 247 322
2019 380 281
2018 329 240
2017 274 156
Prior to 2017 471 385
Within the Revolving Period 164 182
Converted to Term 185 222
Total 2,199 1,967
Less than 620 | Retail | Residential mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 8 12
2020 56 28
2019 166 35
2018 167 58
2017 165 50
Prior to 2017 281 185
Within the Revolving Period 0 0
Converted to Term 0 0
Total 843 368
Less than 620 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 1
2020 2 17
2019 16 30
2018 22 29
2017 21 18
Prior to 2017 96 122
Within the Revolving Period 86 105
Converted to Term 179 214
Total 422 536
Less than 620 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 120 140
2020 142 242
2019 168 189
2018 118 137
2017 75 79
Prior to 2017 45 34
Within the Revolving Period 0 0
Converted to Term 0 0
Total 668 821
Less than 620 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2 2
2020 8 5
2019 11 10
2018 11 10
2017 10 8
Prior to 2017 46 41
Within the Revolving Period 0 0
Converted to Term 0 0
Total 88 76
Less than 620 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 19 24
2020 39 30
2019 19 17
2018 11 6
2017 3 1
Prior to 2017 3 3
Within the Revolving Period 78 77
Converted to Term 6 8
Total 178 166
No FICO available | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 136 59
2020 12 3
2019 1 1
2018 0 5
2017 0 1
Prior to 2017 64 78
Within the Revolving Period 313 272
Converted to Term 1 2
Total 527 421
No FICO available | Retail | Residential mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2 1
2020 5 2
2019 1 1
2018 0 5
2017 0 1
Prior to 2017 10 14
Within the Revolving Period 0 0
Converted to Term 0 0
Total 18 24
No FICO available | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 4 2
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior to 2017 0 4
Within the Revolving Period 0 0
Converted to Term 0 0
Total 4 6
No FICO available | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 10 2
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior to 2017 54 60
Within the Revolving Period 0 0
Converted to Term 0 0
Total 64 62
No FICO available | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 120 54
2020 7 1
2019 0 0
2018 0 0
2017 0 0
Prior to 2017 0 0
Within the Revolving Period 313 272
Converted to Term 1 2
Total $ 441 $ 329