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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 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 126,414 | $ 117,946
Total | 127,528 | 119,088
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 497 | 511
Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 198 | 212
Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 419 | 419
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 65,834 | 57,358
Total | 66,032 | 57,538
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 48,909 | 41,340
Total | 49,092 | 41,479
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 14,494 | 13,520
Total | 14,502 | 13,522
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,431 | 2,498
Total | 2,438 | 2,537
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 104 | 83
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 97 | 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 | 6 | 37
Commercial | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 34 | 28
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 28 | 27
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 6 | 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 | 60 | 69
Commercial | Financing Receivables 90 Days or More Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 58 | 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 | 1 | 2
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 60,580 | 60,588
Total | 61,496 | 61,550
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 18,586 | 18,947
Total | 18,721 | 19,083
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 12,681 | 12,834
Total | 12,992 | 13,154
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 11,856 | 11,788
Total | 12,157 | 12,120
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 10,835 | 10,290
Total | 10,887 | 10,347
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 6,622 | 6,729
Total | 6,739 | 6,846
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 393 | 428
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 25 | 35
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 92 | 91
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 206 | 227
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 24 | 30
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 46 | 45
Retail | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 164 | 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 | 34 | 40
Retail | Financing Receivables 60 To 89 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 72 | 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 | 359 | 350
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 94 | 84
Retail | Financing Receivables 90 Days or More Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 185 | 189
Retail | Financing Receivables 90 Days or More Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 23 | 24
Retail | Financing Receivables 90 Days or More Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 15 | 12
Retail | Financing Receivables 90 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 42 | $ 41

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