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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		6 Months Ended
	Jun. 30, 2021 USD ($) contract	Jun. 30, 2020 USD ($) contract	Jun. 30, 2021 USD ($) contract	Jun. 30, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	2,017	2,229	3,659	3,761
Post-modification	$ 252	$ 124	$ 295	$ 200
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	11	16	20	31
Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	126	21	140	28
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 115	$ 87	$ 135	$ 141
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	15	19	22	38
Post-modification	$ 57	$ 56	$ 60	$ 97
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	3	3	6	3
Commercial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 54	$ 53	$ 54	$ 94
Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	15	19	22	38
Post-modification	$ 57	$ 56	$ 60	$ 97
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	3	3	6	3
Commercial | Commercial and industrial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 54	$ 53	$ 54	$ 94
Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0	0	0
Post-modification	$ 0	$ 0	$ 0	$ 0
Commercial | Commercial real estate | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	0	0	0	0
Commercial | Commercial real estate | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	0	0	0	0
Commercial | Commercial real estate | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 0	$ 0	$ 0	$ 0
Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	2,002	2,210	3,637	3,723
Post-modification	$ 195	$ 68	$ 235	$ 103
Retail | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	11	16	20	31
Retail | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	123	18	134	25
Retail | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 61	$ 34	$ 81	$ 47
Retail | Residential mortgages (2)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	671	145	713	241
Post-modification	$ 172	$ 28	$ 185	$ 45
Retail | Residential mortgages (2) | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	8	11	12	17
Retail | Residential mortgages (2) | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	120	14	126	21
Retail | Residential mortgages (2) | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 44	$ 3	$ 47	$ 7
Retail | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	102	266	249	389
Post-modification	$ 7	$ 17	$ 18	$ 25
Retail | Home equity | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	1	2	3	6
Retail | Home equity | Maturity Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	3	4	8	4
Retail | Home equity | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	$ 3	$ 11	$ 7	$ 15
Retail | Automobile
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	379	947	1,048	1,177
Post-modification	$ 6	$ 15	$ 14	$ 18
Retail | Automobile | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	1	0	1	1
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	$ 5	$ 15	$ 13	$ 17
Retail | Education
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	265	142	412	233
Post-modification	$ 9	$ 4	$ 13	$ 6
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	$ 9	$ 4	$ 13	$ 6
Retail | Other retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	585	710	1,215	1,683
Post-modification	$ 1	$ 4	$ 5	$ 9
Retail | Other retail | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification	1	3	4	7
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	$ 0	$ 1	$ 1	$ 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=121611835&loc=SL6953676-111524

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
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