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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
ACL Balance	$ 2,000		$ 2,000		$ 2,700
Charge-offs			280
Provision charged to income	(33)	$ 428	(386)	$ 1,492
Loans and leases	123,318		123,318		123,090
Mortgage loans collateralized by OREO	150		150		119
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Charge-offs increase (decrease)			(126)
Loans and leases	57,955		57,955		60,793
Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Charge-offs increase (decrease)			(97)
Loans and leases	65,363		65,363		62,297
Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	41,854		41,854		44,173
Collateral Dependent | Home Equity Loan and Residential Mortgages | Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	543		543		552
Collateral Dependent | Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	$ 42		$ 42		$ 206

X

- Definition

Financing Receivable, Allowance For Credit Loss Including Unfunded Lending Commitments

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Recorded investment in financing receivables that are on nonaccrual status and are collateralized by land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement as of the balance sheet date.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount, before allowance for credit loss, of financing receivable.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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