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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Accruing and Nonaccruing Past Due Amounts (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 121,212 | $ 121,646
Total | 122,581 | 123,090
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 413 | 594
Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 161 | 257
Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 795 | 593
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 58,906 | 60,304
Total | 59,083 | 60,793
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 42,769 | 43,817
Total | 42,842 | 44,173
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 14,310 | 14,531
Total | 14,412 | 14,652
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,827 | 1,956
Total | 1,829 | 1,968
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 25 | 233
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 24 | 223
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1 | 1
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 9
Commercial | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 7 | 101
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 7 | 16
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 85
Commercial | Financing Receivables 60 To 89 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Commercial | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 145 | 155
Commercial | Financing Receivables 90 Days or More Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 42 | 117
Commercial | Financing Receivables 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 101 | 35
Commercial | Financing Receivables 90 Days or More Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2 | 3
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 62,306 | 61,342
Total | 63,498 | 62,297
Retail | Residential mortgages (2) |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 19,885 | 19,291
Total | 20,538 | 19,539
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 11,607 | 11,848
Total | 11,841 | 12,149
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 12,613 | 11,901
Total | 12,780 | 12,153
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 12,747 | 12,255
Total | 12,800 | 12,308
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 5,454 | 6,047
Total | 5,539 | 6,148
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 388 | 361
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages (2) |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 176 | 59
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 32 | 61
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 114 | 170
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 29 | 33
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 37 | 38
Retail | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 154 | 156
Retail | Financing Receivables 60 To 89 Days Past Due | Residential mortgages (2) |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 61 | 21
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 17 | 28
Retail | Financing Receivables 60 To 89 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 43 | 65
Retail | Financing Receivables 60 To 89 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 13 | 13
Retail | Financing Receivables 60 To 89 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 20 | 29
Retail | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 650 | 438
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgages (2) |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 416 | 168
Retail | Financing Receivables 90 Days or More Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 185 | 212
Retail | Financing Receivables 90 Days or More Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 10 | 17
Retail | Financing Receivables 90 Days or More Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 11 | 7
Retail | Financing Receivables 90 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 28 | $ 34

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