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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Modified (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 721	$ 461	$ 1,233	$ 617	$ 1,550
Total as a % of Loan Class	0.51%	0.30%	0.87%	0.41%
Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				$ 449	1,150
30-59
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				32	79
60-89
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				2	11
90+
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				4	22
Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				130	288
Unfunded loan commitment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis			$ 73			$ 221
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 665	$ 424	$ 1,113	$ 550	1,335
Total as a % of Loan Class	0.92%	0.54%	1.55%	0.70%
Commercial | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				$ 407	1,023
Commercial | 30-59
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				31	77
Commercial | 60-89
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Commercial | 90+
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Commercial | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				112	235
Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 198	$ 125	$ 321	$ 214	426
Total as a % of Loan Class	0.45%	0.26%	0.74%	0.45%
Weighted-Average Interest Rate Reduction	1.59%	2.87%	3.84%	3.06%
Weighted-Average Term Extension (in Months)	8 months	9 months	10 months	9 months
Weighted-Average Payment Deferral	$ 1	$ 0	$ 1	$ 0
Commercial | Commercial and industrial | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				151	300
Commercial | Commercial and industrial | 30-59
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				7	11
Commercial | Commercial and industrial | 60-89
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Commercial | Commercial and industrial | 90+
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Commercial | Commercial and industrial | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				56	115
Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 467	$ 299	$ 792	$ 336	909
Total as a % of Loan Class	1.65%	1.03%	2.80%	1.16%
Weighted-Average Interest Rate Reduction	2.44%	0.00%	1.24%	0.00%
Weighted-Average Term Extension (in Months)	9 months	7 months	16 months	8 months
Weighted-Average Payment Deferral	$ 1	$ 0	$ 1	$ 0
Commercial | Commercial real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				256	723
Commercial | Commercial real estate | 30-59
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				24	66
Commercial | Commercial real estate | 60-89
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Commercial | Commercial real estate | 90+
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Commercial | Commercial real estate | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				56	120
Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 56	$ 37	$ 120	$ 67	215
Total as a % of Loan Class	0.08%	0.05%	0.17%	0.09%
Retail | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				$ 42	127
Retail | 30-59
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				1	2
Retail | 60-89
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				2	11
Retail | 90+
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				4	22
Retail | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				18	53
Retail | Residential mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 24	$ 27	$ 65	$ 49	121
Total as a % of Loan Class	0.08%	0.09%	0.20%	0.16%
Weighted-Average Interest Rate Reduction	1.45%	2.04%	1.63%	1.86%
Weighted-Average Term Extension (in Months)	99 months	52 months	92 months	48 months
Weighted-Average Payment Deferral	$ 0	$ 0	$ 0	$ 0
Retail | Residential mortgages | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				33	79
Retail | Residential mortgages | 30-59
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Retail | Residential mortgages | 60-89
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				2	9
Retail | Residential mortgages | 90+
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				4	22
Retail | Residential mortgages | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				10	11
Retail | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 4	$ 4	$ 9	$ 7	16
Total as a % of Loan Class	0.03%	0.03%	0.06%	0.05%
Weighted-Average Interest Rate Reduction	4.63%	2.20%	3.82%	2.12%
Weighted-Average Term Extension (in Months)	92 months	115 months	90 months	125 months
Weighted-Average Payment Deferral	$ 0	$ 0	$ 0	$ 0
Retail | Home equity | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				1	6
Retail | Home equity | 30-59
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Retail | Home equity | 60-89
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Retail | Home equity | 90+
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Retail | Home equity | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				6	10
Retail | Automobile
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0	$ 0	$ 0	$ 0	0
Total as a % of Loan Class	0.00%	0.00%	0.00%	0.00%
Weighted-Average Interest Rate Reduction	0.00%	2.40%	0.00%	2.59%
Weighted-Average Term Extension (in Months)		19 months		21 months
Weighted-Average Payment Deferral	$ 0	$ 0	$ 0	$ 0
Retail | Automobile | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Retail | Automobile | 30-59
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Retail | Automobile | 60-89
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Retail | Automobile | 90+
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Retail | Automobile | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Retail | Education
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 24	$ 3	$ 37	$ 5	64
Total as a % of Loan Class	0.21%	0.02%	0.33%	0.04%
Weighted-Average Interest Rate Reduction	4.37%	4.90%	4.41%	5.00%
Weighted-Average Term Extension (in Months)	24 months		24 months
Weighted-Average Payment Deferral	$ 0	$ 0	$ 0	$ 0
Retail | Education | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				4	31
Retail | Education | 30-59
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	1
Retail | Education | 60-89
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	1
Retail | Education | 90+
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Retail | Education | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				1	31
Retail | Other retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 4	$ 3	$ 9	$ 6	14
Total as a % of Loan Class	0.08%	0.06%	0.19%	0.12%
Weighted-Average Interest Rate Reduction	20.41%	18.76%	20.05%	18.28%
Weighted-Average Term Extension (in Months)				22 months
Weighted-Average Payment Deferral	$ 0	$ 0	$ 0	$ 0
Retail | Other retail | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				4	11
Retail | Other retail | 30-59
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				1	1
Retail | Other retail | 60-89
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	1
Retail | Other retail | 90+
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				0	0
Retail | Other retail | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis				1	$ 1
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	10	7	20	14
Interest Rate Reduction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Interest Rate Reduction | Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Interest Rate Reduction | Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Interest Rate Reduction | Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	10	7	20	14
Interest Rate Reduction | Retail | Residential mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	2	2	3	4
Interest Rate Reduction | Retail | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	1	0	2	0
Interest Rate Reduction | Retail | Automobile
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Interest Rate Reduction | Retail | Education
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	3	2	6	4
Interest Rate Reduction | Retail | Other retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	4	3	9	6
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	509	440	831	533
Term Extension | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	491	421	779	495
Term Extension | Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	184	123	210	160
Term Extension | Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	307	298	569	335
Term Extension | Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	18	19	52	38
Term Extension | Retail | Residential mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	15	17	50	35
Term Extension | Retail | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	1	2	1	3
Term Extension | Retail | Automobile
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Term Extension | Retail | Education
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	2	0	1	0
Term Extension | Retail | Other retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	125	1	226	33
Payment Delay | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	101	0	188	32
Payment Delay | Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	14	0	78	32
Payment Delay | Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	87	0	110	0
Payment Delay | Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	24	1	38	1
Payment Delay | Retail | Residential mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	5	0	8	0
Payment Delay | Retail | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Payment Delay | Retail | Automobile
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Payment Delay | Retail | Education
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	19	1	30	1
Payment Delay | Retail | Other retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Principal Forgiveness | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Principal Forgiveness | Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Amount of Principal Forgiven	0	0	0	0
Principal Forgiveness | Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Amount of Principal Forgiven	0	0	0	0
Principal Forgiveness | Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Principal Forgiveness | Retail | Residential mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Amount of Principal Forgiven	0	0	0	0
Principal Forgiveness | Retail | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Amount of Principal Forgiven	0	0	0	0
Principal Forgiveness | Retail | Automobile
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Amount of Principal Forgiven	0	0	0	0
Principal Forgiveness | Retail | Education
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Amount of Principal Forgiven	0	0	0	0
Principal Forgiveness | Retail | Other retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Amount of Principal Forgiven	2	1	4	2
Interest Rate Reduction and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	28	11	74	15
Interest Rate Reduction and Term Extension | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	24	1	64	1
Interest Rate Reduction and Term Extension | Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	1	1	1
Interest Rate Reduction and Term Extension | Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	24	0	63	0
Interest Rate Reduction and Term Extension | Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	4	10	10	14
Interest Rate Reduction and Term Extension | Retail | Residential mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	2	8	4	10
Interest Rate Reduction and Term Extension | Retail | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	2	2	6	4
Interest Rate Reduction and Term Extension | Retail | Automobile
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Interest Rate Reduction and Term Extension | Retail | Education
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Interest Rate Reduction and Term Extension | Retail | Other retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	49	2	82	22
Term Extension and Payment Delay | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	49	2	82	22
Term Extension and Payment Delay | Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	1	32	21
Term Extension and Payment Delay | Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	49	1	50	1
Term Extension and Payment Delay | Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Term Extension and Payment Delay | Retail | Residential mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Term Extension and Payment Delay | Retail | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Term Extension and Payment Delay | Retail | Automobile
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Term Extension and Payment Delay | Retail | Education
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0	0	0
Term Extension and Payment Delay | Retail | Other retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0	$ 0	$ 0	$ 0

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