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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 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 121,646 | $ 117,946
Total | 123,090 | 119,088
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 594 | 511
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 257 | 212
Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 593 | 419
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 60,304 | 57,358
Total | 60,793 | 57,538
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 43,817 | 41,340
Total | 44,173 | 41,479
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 14,531 | 13,520
Total | 14,652 | 13,522
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,956 | 2,498
Total | 1,968 | 2,537
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 233 | 83
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 223 | 45
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 | 9 | 37
Commercial | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 101 | 28
Commercial | Financing Receivables, 60 to 89 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 16 | 27
Commercial | Financing Receivables, 60 to 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 85 | 1
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 | 155 | 69
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 117 | 67
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 35 | 0
Commercial | Financing Receivables, 90 Days or More Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 3 | 2
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 61,342 | 60,588
Total | 62,297 | 61,550
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 19,291 | 18,947
Total | 19,539 | 19,083
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 11,848 | 12,834
Total | 12,149 | 13,154
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 11,901 | 11,788
Total | 12,153 | 12,120
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 12,255 | 10,290
Total | 12,308 | 10,347
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 6,047 | 6,729
Total | 6,148 | 6,846
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 361 | 428
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 59 | 35
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 61 | 91
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 170 | 227
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 33 | 30
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 38 | 45
Retail | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 156 | 184
Retail | Financing Receivables, 60 to 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 21 | 17
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 28 | 40
Retail | Financing Receivables, 60 to 89 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 65 | 81
Retail | Financing Receivables, 60 to 89 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 13 | 15
Retail | Financing Receivables, 60 to 89 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 29 | 31
Retail | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 438 | 350
Retail | Financing Receivables, 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 168 | 84
Retail | Financing Receivables, 90 Days or More Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 212 | 189
Retail | Financing Receivables, 90 Days or More Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 17 | 24
Retail | Financing Receivables, 90 Days or More Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 7 | 12
Retail | Financing Receivables, 90 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 34 | $ 41

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