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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other income	$ 67,000,000	$ 91,000,000	$ 67,000,000
90+ days past due and accruing	62,000,000
Nonaccrual loans and leases	1,019,000,000	703,000,000
Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
90+ days past due and accruing	21,000,000
Nonaccrual loans and leases	458,000,000	$ 245,000,000
Commercial | Commercial And Industrial, and Commercial Real Estate Loans Held For Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
90+ days past due and accruing	0
Nonaccrual loans and leases	$ 0

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Amount of financing receivable 90 days or more past due and still accruing.

+ References

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-Publisher FASB
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Amount of financing receivable on nonaccrual status.

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