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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
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Current $ 120,972 $ 121,646
Total 122,195 123,090
Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past Due 518 594
Financing Receivables 60 To 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past Due 164 257
Financing Receivables 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past Due 541 593
Commercial    
Financing Receivable, Past Due [Line Items]    
Current 60,006 60,304
Total 60,413 60,793
Commercial | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Current 43,768 43,817
Total 44,058 44,173
Commercial | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Current 14,440 14,531
Total 14,553 14,652
Commercial | Leases    
Financing Receivable, Past Due [Line Items]    
Current 1,798 1,956
Total 1,802 1,968
Commercial | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past Due 240 233
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Past Due 178 223
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Past Due 60 1
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases    
Financing Receivable, Past Due [Line Items]    
Past Due 2 9
Commercial | Financing Receivables 60 To 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past Due 56 101
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Past Due 20 16
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Past Due 36 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 111 155
Commercial | Financing Receivables 90 Days or More Past Due | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Past Due 92 117
Commercial | Financing Receivables 90 Days or More Past Due | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Past Due 17 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 60,966 61,342
Total 61,782 62,297
Retail | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Current 18,951 19,291
Total 19,202 19,539
Retail | Home equity    
Financing Receivable, Past Due [Line Items]    
Current 11,599 11,848
Total 11,854 12,149
Retail | Automobile    
Financing Receivable, Past Due [Line Items]    
Current 12,176 11,901
Total 12,344 12,153
Retail | Education    
Financing Receivable, Past Due [Line Items]    
Current 12,638 12,255
Total 12,691 12,308
Retail | Other retail    
Financing Receivable, Past Due [Line Items]    
Current 5,602 6,047
Total 5,691 6,148
Retail | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past Due 278 361
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Past Due 55 59
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity    
Financing Receivable, Past Due [Line Items]    
Past Due 46 61
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile    
Financing Receivable, Past Due [Line Items]    
Past Due 117 170
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 31 38
Retail | Financing Receivables 60 To 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past Due 108 156
Retail | Financing Receivables 60 To 89 Days Past Due | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Past Due 11 21
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity    
Financing Receivable, Past Due [Line Items]    
Past Due 19 28
Retail | Financing Receivables 60 To 89 Days Past Due | Automobile    
Financing Receivable, Past Due [Line Items]    
Past Due 41 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 24 29
Retail | Financing Receivables 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Past Due 430 438
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Past Due 185 168
Retail | Financing Receivables 90 Days or More Past Due | Home equity    
Financing Receivable, Past Due [Line Items]    
Past Due 190 212
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 $ 34 $ 34