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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) counterparty	Dec. 31, 2019 USD ($)	Dec. 31, 2003
Risk Participation Agreements [Abstract]
Risk participation agreements number of counterparties | counterparty	77
Risk participation agreements, Maximum term	9 years
Commercial loans held for sale | Purchase commitment
Commitments [Abstract]
Unsettled commercial loan trade purchases	$ 170	$ 183
Unsettled commercial loan trade sales	$ 237	$ 236
Minimum
Risk Participation Agreements [Abstract]
Risk participation agreements, Average term	1 year
Maximum
Risk Participation Agreements [Abstract]
Risk participation agreements, Average term	5 years
Marketing rights
Marketing Rights [Abstract]
Commitment period			25 years
Financial standby letters of credit
Letters of Credit [Abstract]
Letters of credit terms	10 years
Commercial letters of credit
Letters of Credit [Abstract]
Letters of credit terms	1 year

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Commitments [Abstract]

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Letters of Credit [Abstract]

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Marketing Rights [Abstract]

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Risk Participation Agreements [Abstract]

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Average period covered by risk participation contracts in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Represents the number of risk participation agreement counterparties.

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Maximum period covered by risk participation contracts in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The face amount of commercial and commercial real estate loans committed to purchase, but unsettled as of the balance sheet date.

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Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61082-112788

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Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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