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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 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 124,328 | $ 117,946
Total | 125,713 | 119,088
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 511 | 511
Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 271 | 212
Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 603 | 419
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 64,455 | 57,358
Total | 64,930 | 57,538
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 47,768 | 41,340
Total | 48,017 | 41,479
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 14,340 | 13,520
Total | 14,485 | 13,522
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,347 | 2,498
Total | 2,428 | 2,537
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 157 | 83
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 60 | 45
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 92 | 1
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 5 | 37
Commercial | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 94 | 28
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 30 | 27
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 52 | 1
Commercial | Financing Receivables 60 To 89 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 12 | 0
Commercial | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 224 | 69
Commercial | Financing Receivables 90 Days or More Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 159 | 67
Commercial | Financing Receivables 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1 | 0
Commercial | Financing Receivables 90 Days or More Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 64 | 2
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 59,873 | 60,588
Total | 60,783 | 61,550
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 19,044 | 18,947
Total | 19,245 | 19,083
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 12,212 | 12,834
Total | 12,541 | 13,154
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 11,784 | 11,788
Total | 12,028 | 12,120
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 10,548 | 10,290
Total | 10,591 | 10,347
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 6,285 | 6,729
Total | 6,378 | 6,846
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 354 | 428
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 65 | 35
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 71 | 91
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 162 | 227
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 25 | 30
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 31 | 45
Retail | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 177 | 184
Retail | Financing Receivables 60 To 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 33 | 17
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 41 | 40
Retail | Financing Receivables 60 To 89 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 66 | 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 | 25 | 31
Retail | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 379 | 350
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 103 | 84
Retail | Financing Receivables 90 Days or More Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 217 | 189
Retail | Financing Receivables 90 Days or More Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 16 | 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 | $ 37 | $ 41

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