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LOANS AND LEASES - Summary of Loans and Leases Portfolio (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 123,090	$ 119,088
SBA Guaranteed PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	4,200
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	60,793	57,538
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	44,173	41,479
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,652	13,522
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,968	2,537
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	62,297	61,550
Retail | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	19,539	19,083
Retail | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,149	13,154
Retail | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,153	12,120
Retail | Education
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,308	10,347
Retail | Other retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 6,148	$ 6,846

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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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