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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring Activity (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($) contract	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1,176	2,115	4,835	5,876
Post-modification	$ 81	$ 158	$ 376	$ 358
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	5	13	25	44
Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	46	113	186	141
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 30	$ 32	$ 165	$ 173
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	7	14	29	52
Post-modification	$ 48	$ 104	$ 108	$ 201
Commercial | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	0	0	0	0
Commercial | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	38	103	44	106
Commercial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 10	$ 1	$ 64	$ 95
Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	7	14	29	52
Post-modification	$ 48	$ 104	$ 108	$ 201
Commercial | Commercial and industrial | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	0	0	0	0
Commercial | Commercial and industrial | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	38	103	44	106
Commercial | Commercial and industrial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 10	$ 1	$ 64	$ 95
Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1,169	2,101	4,806	5,824
Post-modification	$ 33	$ 54	$ 268	$ 157
Retail | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	5	13	25	44
Retail | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	8	10	142	35
Retail | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 20	$ 31	$ 101	$ 78
Retail | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	101	107	814	348
Post-modification	$ 16	$ 19	$ 201	$ 64
Retail | Residential mortgage | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	2	9	14	26
Retail | Residential mortgage | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	7	6	133	27
Retail | Residential mortgage | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 7	$ 4	$ 54	$ 11
Retail | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	69	179	318	568
Post-modification	$ 4	$ 12	$ 22	$ 37
Retail | Home equity | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	0	2	3	8
Retail | Home equity | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	1	4	9	8
Retail | Home equity | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 3	$ 6	$ 10	$ 21
Retail | Automobile
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	224	1,191	1,272	2,368
Post-modification	$ 1	$ 19	$ 15	$ 37
Retail | Automobile | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	0	1	1	2
Retail | Automobile | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	0	0	0	0
Retail | Automobile | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 1	$ 18	$ 14	$ 35
Retail | Education
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	226	140	638	373
Post-modification	$ 8	$ 3	$ 21	$ 9
Retail | Education | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	0	0	0	0
Retail | Education | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	0	0	0	0
Retail | Education | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 8	$ 3	$ 21	$ 9
Retail | Other retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	549	484	1,764	2,167
Post-modification	$ 4	$ 1	$ 9	$ 10
Retail | Other retail | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	3	1	7	8
Retail | Other retail | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	0	0	0	0
Retail | Other retail | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 1	$ 0	$ 2	$ 2

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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=123577603&loc=SL6953676-111524

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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