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LOANS AND LEASES - Summary of Loans and Leases Portfolio (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 122,195	$ 123,090
SBA Guaranteed PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	5,100	4,200
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	60,413	60,793
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	44,058	44,173
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,553	14,652
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,802	1,968
Commercial | SBA Guaranteed PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	5,100
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	61,782	62,297
Retail | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	19,202	19,539
Retail | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	11,854	12,149
Retail | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,344	12,153
Retail | Education
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,691	12,308
Retail | Other retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 5,691	$ 6,148

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-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448

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