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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Accruing and Nonaccruing Past Due Amounts (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 123,318	$ 123,090
Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	121,921	121,646
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	407	594
Financing Receivables 60 To 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	166	257
Financing Receivables 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	824	593
Commercial
Financing Receivable, Past Due [Line Items]
Loans and leases	57,955	60,793
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans and leases	41,854	44,173
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and leases	14,508	14,652
Commercial | Leases
Financing Receivable, Past Due [Line Items]
Loans and leases	1,593	1,968
Commercial | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	57,776	60,304
Commercial | Financial Asset, 1 to 29 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans and leases	41,783	43,817
Commercial | Financial Asset, 1 to 29 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and leases	14,402	14,531
Commercial | Financial Asset, 1 to 29 Days Past Due | Leases
Financing Receivable, Past Due [Line Items]
Loans and leases	1,591	1,956
Commercial | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	28	233
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans and leases	25	223
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and leases	3	1
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases
Financing Receivable, Past Due [Line Items]
Loans and leases	0	9
Commercial | Financing Receivables 60 To 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	9	101
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans and leases	3	16
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and leases	5	85
Commercial | Financing Receivables 60 To 89 Days Past Due | Leases
Financing Receivable, Past Due [Line Items]
Loans and leases	1	0
Commercial | Financing Receivables 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	142	155
Commercial | Financing Receivables 90 Days or More Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans and leases	43	117
Commercial | Financing Receivables 90 Days or More Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and leases	98	35
Commercial | Financing Receivables 90 Days or More Past Due | Leases
Financing Receivable, Past Due [Line Items]
Loans and leases	1	3
Retail
Financing Receivable, Past Due [Line Items]
Loans and leases	65,363	62,297
Retail | Residential mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	21,513	19,539
Retail | Home equity
Financing Receivable, Past Due [Line Items]
Loans and leases	11,889	12,149
Retail | Automobile
Financing Receivable, Past Due [Line Items]
Loans and leases	13,492	12,153
Retail | Education
Financing Receivable, Past Due [Line Items]
Loans and leases	13,000	12,308
Retail | Other retail
Financing Receivable, Past Due [Line Items]
Loans and leases	5,469	6,148
Retail | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	64,145	61,342
Retail | Financial Asset, 1 to 29 Days Past Due | Residential mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	20,861	19,291
Retail | Financial Asset, 1 to 29 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Loans and leases	11,654	11,848
Retail | Financial Asset, 1 to 29 Days Past Due | Automobile
Financing Receivable, Past Due [Line Items]
Loans and leases	13,318	11,901
Retail | Financial Asset, 1 to 29 Days Past Due | Education
Financing Receivable, Past Due [Line Items]
Loans and leases	12,941	12,255
Retail | Financial Asset, 1 to 29 Days Past Due | Other retail
Financing Receivable, Past Due [Line Items]
Loans and leases	5,371	6,047
Retail | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	379	361
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	155	59
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Loans and leases	35	61
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile
Financing Receivable, Past Due [Line Items]
Loans and leases	117	170
Retail | Financing Receivables, 30 to 59 Days Past Due | Education
Financing Receivable, Past Due [Line Items]
Loans and leases	33	33
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail
Financing Receivable, Past Due [Line Items]
Loans and leases	39	38
Retail | Financing Receivables 60 To 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	157	156
Retail | Financing Receivables 60 To 89 Days Past Due | Residential mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	57	21
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Loans and leases	16	28
Retail | Financing Receivables 60 To 89 Days Past Due | Automobile
Financing Receivable, Past Due [Line Items]
Loans and leases	42	65
Retail | Financing Receivables 60 To 89 Days Past Due | Education
Financing Receivable, Past Due [Line Items]
Loans and leases	14	13
Retail | Financing Receivables 60 To 89 Days Past Due | Other retail
Financing Receivable, Past Due [Line Items]
Loans and leases	28	29
Retail | Financing Receivables 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	682	438
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	440	168
Retail | Financing Receivables 90 Days or More Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Loans and leases	184	212
Retail | Financing Receivables 90 Days or More Past Due | Automobile
Financing Receivable, Past Due [Line Items]
Loans and leases	15	17
Retail | Financing Receivables 90 Days or More Past Due | Education
Financing Receivable, Past Due [Line Items]
Loans and leases	12	7
Retail | Financing Receivables 90 Days or More Past Due | Other retail
Financing Receivable, Past Due [Line Items]
Loans and leases	31	34
Retail | Financing Receivables 90 Days or More Past Due | FHA, VA And USDA Loans
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 289	$ 44

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