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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 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 123,318 | $ 123,090
Financial Asset, 1 to 29 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 121,921 | 121,646
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 407 | 594
Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 166 | 257
Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 824 | 593
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 57,955 | 60,793
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 41,854 | 44,173
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 14,508 | 14,652
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1,593 | 1,968
Commercial | Financial Asset, 1 to 29 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 57,776 | 60,304
Commercial | Financial Asset, 1 to 29 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 41,783 | 43,817
Commercial | Financial Asset, 1 to 29 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 14,402 | 14,531
Commercial | Financial Asset, 1 to 29 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1,591 | 1,956
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 28 | 233
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 25 | 223
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 3 | 1
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 9
Commercial | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 9 | 101
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 3 | 16
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 5 | 85
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 | 142 | 155
Commercial | Financing Receivables 90 Days or More Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 43 | 117
Commercial | Financing Receivables 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 98 | 35
Commercial | Financing Receivables 90 Days or More Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1 | 3
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 65,363 | 62,297
Retail | Residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 21,513 | 19,539
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 11,889 | 12,149
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 13,492 | 12,153
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 13,000 | 12,308
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 5,469 | 6,148
Retail | Financial Asset, 1 to 29 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 64,145 | 61,342
Retail | Financial Asset, 1 to 29 Days Past Due | Residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 20,861 | 19,291
Retail | Financial Asset, 1 to 29 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 11,654 | 11,848
Retail | Financial Asset, 1 to 29 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 13,318 | 11,901
Retail | Financial Asset, 1 to 29 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 12,941 | 12,255
Retail | Financial Asset, 1 to 29 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 5,371 | 6,047
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 379 | 361
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 155 | 59
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 35 | 61
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 117 | 170
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 33 | 33
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 39 | 38
Retail | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 157 | 156
Retail | Financing Receivables 60 To 89 Days Past Due | Residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 57 | 21
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 16 | 28
Retail | Financing Receivables 60 To 89 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 42 | 65
Retail | Financing Receivables 60 To 89 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 14 | 13
Retail | Financing Receivables 60 To 89 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 28 | 29
Retail | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 682 | 438
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 440 | 168
Retail | Financing Receivables 90 Days or More Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 184 | 212
Retail | Financing Receivables 90 Days or More Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 15 | 17
Retail | Financing Receivables 90 Days or More Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 12 | 7
Retail | Financing Receivables 90 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 31 | 34
Retail | Financing Receivables 90 Days or More Past Due | FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 289 | $ 44

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