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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Accruing and Nonaccruing Past Due Amounts (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 128,163 | $ 123,090
Nonaccrual | 702 | 1,019
Nonaccrual with no ACL | 386 | 380
Financing Receivables, 1 to 29 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 126,308 | 121,328
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 412 | 544
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 166 | 138
Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 575 | 61
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 60,350 | 60,793
Nonaccrual | 183 | 458
Nonaccrual with no ACL | 37 | 58
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 44,500 | 44,173
Nonaccrual | 171 | 280
Nonaccrual with no ACL | 36 | 56
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 14,264 | 14,652
Nonaccrual | 11 | 176
Nonaccrual with no ACL | 1 | 2
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1,586 | 1,968
Nonaccrual | 1 | 2
Nonaccrual with no ACL | 0 | 0
Commercial | Financing Receivables, 1 to 29 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 60,064 | 60,097
Commercial | Financing Receivables, 1 to 29 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 44,247 | 43,666
Commercial | Financing Receivables, 1 to 29 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 14,247 | 14,475
Commercial | Financing Receivables, 1 to 29 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1,570 | 1,956
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 67 | 208
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 47 | 198
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 6 | 1
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 14 | 9
Commercial | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 27 | 9
Commercial | Financing Receivables, 60 to 89 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 26 | 9
Commercial | Financing Receivables, 60 to 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 0
Commercial | Financing Receivables, 60 to 89 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1 | 0
Commercial | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 9 | 21
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 9 | 20
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 0
Commercial | Financing Receivables, 90 Days or More Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 1
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 67,813 | 62,297
Nonaccrual | 519 | 561
Nonaccrual with no ACL | 349 | 322
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 22,822 | 19,539
Nonaccrual with no ACL | 137 | 96
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 12,015 | 12,149
Nonaccrual with no ACL | 186 | 207
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 14,549 | 12,153
Nonaccrual with no ACL | 22 | 17
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 12,997 | 12,308
Nonaccrual with no ACL | 2 | 2
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 5,430 | 6,148
Nonaccrual with no ACL | 2 | 0
Retail | FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 544 | 21
Retail | Financing Receivables, 1 to 29 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 66,244 | 61,231
Retail | Financing Receivables, 1 to 29 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 21,918 | 19,272
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 11,745 | 11,799
Retail | Financing Receivables, 1 to 29 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 14,324 | 11,870
Retail | Financing Receivables, 1 to 29 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 12,926 | 12,245
Retail | Financing Receivables, 1 to 29 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 5,331 | 6,045
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 345 | 336
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 102 | 55
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 38 | 54
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 131 | 157
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 34 | 31
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 40 | 39
Retail | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 139 | 129
Retail | Financing Receivables, 60 to 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 52 | 15
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 12 | 20
Retail | Financing Receivables, 60 to 89 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 39 | 54
Retail | Financing Receivables, 60 to 89 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 13 | 12
Retail | Financing Receivables, 60 to 89 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 23 | 28
Retail | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 566 | 40
Retail | Financing Receivables, 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 549 | 30
Nonaccrual | 201 | 167
Retail | Financing Receivables, 90 Days or More Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 0
Nonaccrual | 220 | 276
Retail | Financing Receivables, 90 Days or More Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 0
Nonaccrual | 55 | 72
Retail | Financing Receivables, 90 Days or More Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1 | 2
Nonaccrual | 23 | 18
Retail | Financing Receivables, 90 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 16 | 8
Nonaccrual | $ 20 | $ 28

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