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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Accruing and Nonaccruing Past Due Amounts (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 122,724 | $ 117,946
Total | 124,071 | 119,088
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 519 | 511
Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 261 | 212
Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 567 | 419
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 61,872 | 57,358
Total | 62,362 | 57,538
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 44,845 | 41,340
Total | 45,185 | 41,479
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 14,743 | 13,520
Total | 14,889 | 13,522
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,284 | 2,498
Total | 2,288 | 2,537
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 196 | 83
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 105 | 45
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 90 | 1
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1 | 37
Commercial | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 130 | 28
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 129 | 27
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 1
Commercial | Financing Receivables 60 To 89 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1 | 0
Commercial | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 164 | 69
Commercial | Financing Receivables 90 Days or More Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 106 | 67
Commercial | Financing Receivables 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 56 | 0
Commercial | Financing Receivables 90 Days or More Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2 | 2
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 60,852 | 60,588
Total | 61,709 | 61,550
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 19,430 | 18,947
Total | 19,633 | 19,083
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 12,007 | 12,834
Total | 12,322 | 13,154
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 11,825 | 11,788
Total | 12,035 | 12,120
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 11,585 | 10,290
Total | 11,631 | 10,347
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 6,005 | 6,729
Total | 6,088 | 6,846
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 323 | 428
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 64 | 35
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 51 | 91
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 147 | 227
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 28 | 30
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 33 | 45
Retail | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 131 | 184
Retail | Financing Receivables 60 To 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 16 | 17
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 29 | 40
Retail | Financing Receivables 60 To 89 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 52 | 81
Retail | Financing Receivables 60 To 89 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 12 | 15
Retail | Financing Receivables 60 To 89 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 22 | 31
Retail | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 403 | 350
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 123 | 84
Retail | Financing Receivables 90 Days or More Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 235 | 189
Retail | Financing Receivables 90 Days or More Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 11 | 24
Retail | Financing Receivables 90 Days or More Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 6 | 12
Retail | Financing Receivables 90 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 28 | $ 41

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