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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring Activity (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) contract	Mar. 31, 2020 USD ($) contract
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	631	992
Amortized Cost | $	$ 9	$ 15
Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	105	45
Amortized Cost | $	$ 14	$ 7
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	906	495
Amortized Cost | $	$ 20	$ 54
Commercial | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0
Amortized Cost | $	$ 0	$ 0
Commercial | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	3	2
Amortized Cost | $	$ 3	$ 0
Commercial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	4	17
Amortized Cost | $	$ 0	$ 41
Commercial | Commercial and industrial | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0
Amortized Cost | $	$ 0	$ 0
Commercial | Commercial and industrial | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	3	2
Amortized Cost | $	$ 3	$ 0
Commercial | Commercial and industrial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	4	17
Amortized Cost | $	$ 0	$ 41
Commercial | Commercial real estate | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0
Amortized Cost | $	$ 0	$ 0
Commercial | Commercial real estate | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0
Amortized Cost | $	$ 0	$ 0
Commercial | Commercial real estate | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0
Amortized Cost | $	$ 0	$ 0
Retail | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	631	992
Amortized Cost | $	$ 9	$ 15
Retail | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	102	43
Amortized Cost | $	$ 11	$ 7
Retail | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	902	478
Amortized Cost | $	$ 20	$ 13
Retail | Residential mortgages | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	20	38
Amortized Cost | $	$ 4	$ 6
Retail | Residential mortgages | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	9	37
Amortized Cost | $	$ 6	$ 7
Retail | Residential mortgages | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	13	21
Amortized Cost | $	$ 3	$ 4
Retail | Home equity | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	34	46
Amortized Cost | $	$ 2	$ 4
Retail | Home equity | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	41	6
Amortized Cost | $	$ 5	$ 0
Retail | Home equity | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	72	71
Amortized Cost | $	$ 4	$ 4
Retail | Automobile | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	21	47
Amortized Cost | $	$ 0	$ 1
Retail | Automobile | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	52	0
Amortized Cost | $	$ 0	$ 0
Retail | Automobile | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	596	183
Amortized Cost | $	$ 8	$ 2
Retail | Education | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0
Amortized Cost | $	$ 0	$ 0
Retail | Education | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0
Amortized Cost | $	$ 0	$ 0
Retail | Education | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	147	91
Amortized Cost | $	$ 4	$ 2
Retail | Other retail | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	556	861
Amortized Cost | $	$ 3	$ 4
Retail | Other retail | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0
Amortized Cost | $	$ 0	$ 0
Retail | Other retail | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	74	112
Amortized Cost | $	$ 1	$ 1

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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