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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Amortized Cost Basis by Credit Quality Indicator (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 122,195 $ 123,090
SBA Guaranteed PPP Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 5,100 4,200
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 3,415 10,683
2020 10,354 9,445
2019 10,475 7,862
2018 8,100 3,746
2017 3,999 2,200
Prior to 2017 6,511 3,998
Within the Revolving Period 17,173 22,459
Converted to Term 386 400
Total 60,413 60,793
Commercial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 3,347 10,339
2020 9,990 8,812
2019 9,754 7,219
2018 7,432 3,419
2017 3,528 1,903
Prior to 2017 5,853 3,572
Within the Revolving Period 16,074 20,552
Converted to Term 326 340
Total 56,304 56,156
Commercial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 56
2020 53 398
2019 356 286
2018 315 180
2017 270 156
Prior to 2017 362 239
Within the Revolving Period 415 1,071
Converted to Term 34 34
Total 1,805 2,420
Commercial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 68 207
2020 230 199
2019 354 315
2018 315 109
2017 173 138
Prior to 2017 258 153
Within the Revolving Period 612 749
Converted to Term 23 22
Total 2,033 1,892
Commercial | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 81
2020 81 36
2019 11 42
2018 38 38
2017 28 3
Prior to 2017 38 34
Within the Revolving Period 72 87
Converted to Term 3 4
Total 271 325
Commercial | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 3,022 8,226
2020 7,385 6,199
2019 6,225 4,625
2018 4,523 2,396
2017 2,444 1,301
Prior to 2017 3,840 2,311
Within the Revolving Period 16,233 18,715
Converted to Term 386 400
Total 44,058 44,173
Commercial | Commercial and industrial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 3,000 8,036
2020 7,178 5,730
2019 5,699 4,180
2018 3,995 2,174
2017 2,206 1,157
Prior to 2017 3,384 1,980
Within the Revolving Period 15,134 17,281
Converted to Term 326 340
Total 40,922 40,878
Commercial | Commercial and industrial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 34
2020 41 264
2019 221 163
2018 241 84
2017 86 60
Prior to 2017 244 173
Within the Revolving Period 415 771
Converted to Term 34 34
Total 1,282 1,583
Commercial | Commercial and industrial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 22 91
2020 101 195
2019 294 248
2018 256 100
2017 124 81
Prior to 2017 177 127
Within the Revolving Period 612 600
Converted to Term 23 22
Total 1,609 1,464
Commercial | Commercial and industrial | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 65
2020 65 10
2019 11 34
2018 31 38
2017 28 3
Prior to 2017 35 31
Within the Revolving Period 72 63
Converted to Term 3 4
Total 245 248
Commercial | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 299 1,999
2020 2,552 2,994
2019 4,004 3,004
2018 3,349 1,203
2017 1,433 713
Prior to 2017 1,976 995
Within the Revolving Period 940 3,744
Converted to Term 0 0
Total 14,553 14,652
Commercial | Commercial real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 253 1,848
2020 2,411 2,836
2019 3,815 2,810
2018 3,212 1,106
2017 1,206 566
Prior to 2017 1,794 919
Within the Revolving Period 940 3,271
Converted to Term 0 0
Total 13,631 13,356
Commercial | Commercial real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 19
2020 9 130
2019 131 121
2018 72 92
2017 178 94
Prior to 2017 99 48
Within the Revolving Period 0 300
Converted to Term 0 0
Total 489 804
Commercial | Commercial real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 46 116
2020 116 2
2019 58 65
2018 58 5
2017 49 53
Prior to 2017 81 26
Within the Revolving Period 0 149
Converted to Term 0 0
Total 408 416
Commercial | Commercial real estate | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 16
2020 16 26
2019 0 8
2018 7 0
2017 0 0
Prior to 2017 2 2
Within the Revolving Period 0 24
Converted to Term 0 0
Total 25 76
Commercial | Leases    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 94 458
2020 417 252
2019 246 233
2018 228 147
2017 122 186
Prior to 2017 695 692
Within the Revolving Period 0 0
Converted to Term 0 0
Total 1,802 1,968
Commercial | Leases | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 94 455
2020 401 246
2019 240 229
2018 225 139
2017 116 180
Prior to 2017 675 673
Within the Revolving Period 0 0
Converted to Term 0 0
Total 1,751 1,922
Commercial | Leases | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 3
2020 3 4
2019 4 2
2018 2 4
2017 6 2
Prior to 2017 19 18
Within the Revolving Period 0 0
Converted to Term 0 0
Total 34 33
Commercial | Leases | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 13 2
2019 2 2
2018 1 4
2017 0 4
Prior to 2017 0 0
Within the Revolving Period 0 0
Converted to Term 0 0
Total 16 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
Commercial | SBA Guaranteed PPP Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 5,100  
Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 3,923 17,242
2020 16,683 10,972
2019 9,804 5,335
2018 4,729 4,816
2017 4,233 4,462
Prior to 2017 9,609 6,323
Within the Revolving Period 11,464 11,755
Converted to Term 1,337 1,392
Total 61,782 62,297
Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,229 6,512
2020 6,279 3,493
2019 3,153 1,278
2018 1,119 1,947
2017 1,735 2,770
Prior to 2017 5,687 3,539
Within the Revolving Period 0 0
Converted to Term 0 0
Total 19,202 19,539
Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 6
2020 13 47
2019 52 75
2018 78 78
2017 77 50
Prior to 2017 805 833
Within the Revolving Period 9,515 9,692
Converted to Term 1,314 1,368
Total 11,854 12,149
Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,514 4,728
2020 4,452 3,449
2019 3,075 1,864
2018 1,622 1,232
2017 1,033 642
Prior to 2017 648 238
Within the Revolving Period 0 0
Converted to Term 0 0
Total 12,344 12,153
Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 851 4,094
2020 4,284 2,706
2019 2,528 1,606
2018 1,484 1,333
2017 1,199 952
Prior to 2017 2,345 1,617
Within the Revolving Period 0 0
Converted to Term 0 0
Total 12,691 12,308
Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 329 1,902
2020 1,655 1,277
2019 996 512
2018 426 226
2017 189 48
Prior to 2017 124 96
Within the Revolving Period 1,949 2,063
Converted to Term 23 24
Total 5,691 6,148
Greater than 800 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,087 6,023
2020 6,263 4,448
2019 3,950 2,084
2018 1,772 2,306
2017 1,988 2,382
Prior to 2017 4,583 2,854
Within the Revolving Period 4,591 4,660
Converted to Term 335 344
Total 24,569 25,101
Greater than 800 | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 307 2,687
2020 3,088 1,885
2019 1,756 638
2018 556 1,129
2017 1,014 1,615
Prior to 2017 3,023 1,755
Within the Revolving Period 0 0
Converted to Term 0 0
Total 9,744 9,709
Greater than 800 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 2
2020 3 8
2019 7 10
2018 8 7
2017 6 5
Prior to 2017 192 216
Within the Revolving Period 4,288 4,319
Converted to Term 335 344
Total 4,839 4,911
Greater than 800 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 370 1,056
2020 997 812
2019 749 424
2018 378 312
2017 265 169
Prior to 2017 168 62
Within the Revolving Period 0 0
Converted to Term 0 0
Total 2,927 2,835
Greater than 800 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 347 1,817
2020 1,781 1,363
2019 1,169 849
2018 713 781
2017 647 578
Prior to 2017 1,151 777
Within the Revolving Period 0 0
Converted to Term 0 0
Total 5,808 6,165
Greater than 800 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 63 461
2020 394 380
2019 269 163
2018 117 77
2017 56 15
Prior to 2017 49 44
Within the Revolving Period 303 341
Converted to Term 0 0
Total 1,251 1,481
740-799 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,718 6,864
2020 6,225 3,630
2019 3,185 1,661
2018 1,482 1,345
2017 1,178 1,190
Prior to 2017 2,461 1,597
Within the Revolving Period 3,759 3,872
Converted to Term 319 333
Total 20,327 20,492
740-799 | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 729 2,931
2020 2,369 1,133
2019 944 398
2018 337 527
2017 446 743
Prior to 2017 1,442 904
Within the Revolving Period 0 0
Converted to Term 0 0
Total 6,267 6,636
740-799 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 2
2020 1 6
2019 5 7
2018 6 6
2017 6 5
Prior to 2017 170 180
Within the Revolving Period 3,167 3,234
Converted to Term 317 331
Total 3,672 3,771
740-799 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 495 1,514
2020 1,426 1,022
2019 906 531
2018 460 344
2017 288 172
Prior to 2017 169 59
Within the Revolving Period 0 0
Converted to Term 0 0
Total 3,744 3,642
740-799 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 399 1,797
2020 1,883 1,009
2019 971 541
2018 528 387
2017 370 251
Prior to 2017 638 423
Within the Revolving Period 0 0
Converted to Term 0 0
Total 4,789 4,408
740-799 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 95 620
2020 546 460
2019 359 184
2018 151 81
2017 68 19
Prior to 2017 42 31
Within the Revolving Period 592 638
Converted to Term 2 2
Total 1,855 2,035
680-739 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 801 3,077
2020 2,944 1,842
2019 1,689 917
2018 836 644
2017 586 541
Prior to 2017 1,326 918
Within the Revolving Period 2,141 2,193
Converted to Term 275 289
Total 10,598 10,421
680-739 | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 175 784
2020 699 351
2019 331 162
2018 140 172
2017 157 295
Prior to 2017 681 458
Within the Revolving Period 0 0
Converted to Term 0 0
Total 2,183 2,222
680-739 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 1
2020 1 6
2019 6 10
2018 11 15
2017 16 8
Prior to 2017 175 179
Within the Revolving Period 1,610 1,632
Converted to Term 270 284
Total 2,089 2,135
680-739 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 441 1,347
2020 1,253 889
2019 781 461
2018 396 282
2017 232 138
Prior to 2017 136 47
Within the Revolving Period 0 0
Converted to Term 0 0
Total 3,239 3,164
680-739 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 98 450
2020 560 294
2019 326 173
2018 187 127
2017 136 90
Prior to 2017 312 221
Within the Revolving Period 0 0
Converted to Term 0 0
Total 1,619 1,355
680-739 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 87 495
2020 431 302
2019 245 111
2018 102 48
2017 45 10
Prior to 2017 22 13
Within the Revolving Period 531 561
Converted to Term 5 5
Total 1,468 1,545
620-679 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 263 1,040
2020 999 727
2019 665 391
2018 363 276
2017 266 192
Prior to 2017 668 491
Within the Revolving Period 533 576
Converted to Term 195 202
Total 3,952 3,895
620-679 | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 14 97
2020 96 94
2019 93 44
2018 46 56
2017 65 66
Prior to 2017 306 223
Within the Revolving Period 0 0
Converted to Term 0 0
Total 620 580
620-679 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 3 10
2019 13 18
2018 20 21
2017 23 14
Prior to 2017 144 136
Within the Revolving Period 363 402
Converted to Term 189 195
Total 755 796
620-679 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 188 669
2020 616 484
2019 421 259
2018 220 157
2017 131 84
Prior to 2017 86 32
Within the Revolving Period 0 0
Converted to Term 0 0
Total 1,662 1,685
620-679 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 5 26
2020 55 35
2019 50 33
2018 41 28
2017 34 25
Prior to 2017 125 95
Within the Revolving Period 0 0
Converted to Term 0 0
Total 310 242
620-679 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 56 248
2020 229 104
2019 88 37
2018 36 14
2017 13 3
Prior to 2017 7 5
Within the Revolving Period 170 174
Converted to Term 6 7
Total 605 592
Less than 620 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 24 179
2020 240 322
2019 314 281
2018 276 240
2017 215 156
Prior to 2017 501 385
Within the Revolving Period 161 182
Converted to Term 211 222
Total 1,942 1,967
Less than 620 | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2 12
2020 25 28
2019 28 35
2018 40 58
2017 53 50
Prior to 2017 224 185
Within the Revolving Period 0 0
Converted to Term 0 0
Total 372 368
Less than 620 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 1
2020 5 17
2019 21 30
2018 33 29
2017 26 18
Prior to 2017 124 122
Within the Revolving Period 87 105
Converted to Term 203 214
Total 499 536
Less than 620 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 18 140
2020 159 242
2019 218 189
2018 168 137
2017 117 79
Prior to 2017 87 34
Within the Revolving Period 0 0
Converted to Term 0 0
Total 767 821
Less than 620 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 2
2020 5 5
2019 12 10
2018 15 10
2017 12 8
Prior to 2017 62 41
Within the Revolving Period 0 0
Converted to Term 0 0
Total 106 76
Less than 620 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 4 24
2020 46 30
2019 35 17
2018 20 6
2017 7 1
Prior to 2017 4 3
Within the Revolving Period 74 77
Converted to Term 8 8
Total 198 166
No FICO available | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 30 59
2020 12 3
2019 1 1
2018 0 5
2017 0 1
Prior to 2017 70 78
Within the Revolving Period 279 272
Converted to Term 2 2
Total 394 421
No FICO available | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2 1
2020 2 2
2019 1 1
2018 0 5
2017 0 1
Prior to 2017 11 14
Within the Revolving Period 0 0
Converted to Term 0 0
Total 16 24
No FICO available | Retail | Home equity    
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 0 0
Within the Revolving Period 0 0
Converted to Term 0 0
Total 0 0
No FICO available | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2 2
2020 1 0
2019 0 0
2018 0 0
2017 0 0
Prior to 2017 2 4
Within the Revolving Period 0 0
Converted to Term 0 0
Total 5 6
No FICO available | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2 2
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior to 2017 57 60
Within the Revolving Period 0 0
Converted to Term 0 0
Total 59 62
No FICO available | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 24 54
2020 9 1
2019 0 0
2018 0 0
2017 0 0
Prior to 2017 0 0
Within the Revolving Period 279 272
Converted to Term 2 2
Total $ 314 $ 329