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Loans and Related Allowance for Credit Losses (Modified, Amortized Cost Basis) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1,033	$ 829	$ 2,191	$ 2,686
% of Loan Class	0.32%	0.26%	0.67%	0.84%
Unfunded lending related commitments	$ 700	$ 500	$ 700	$ 500
Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	27
Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	667	626	1,619	1,858
Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	149	137	227	212
Repayment Plan
Financing Receivable [Line Items]
Amortized cost basis, modified	18	22	50	58
Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	26	6	46	304
Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	51	12	56	107
Interest Rate Reduction and Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	15
Interest Rate Reduction, Payment Delay, and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	12	0
Other
Financing Receivable [Line Items]
Amortized cost basis, modified	122	26	181	105
Commercial and industrial | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	23	11	37	146
Commercial and industrial | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	501	389	1,091	1,188
Commercial and industrial | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	73	25	120	206
Commercial real estate | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	27		27
Commercial real estate | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	241	253	631	1,073
Commercial real estate | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	29	87	29	248
Residential real estate | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	1	1	4	3
Residential real estate | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	1	1	5	4
Residential real estate | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	71	28	130	67
Home equity | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	2	3	5	10
Education | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	1	1	4	4
Other consumer | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified			2
Other consumer | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified			1
Commercial Portfolio Segment
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 923	$ 764	$ 1,970	$ 2,523
% of Loan Class	0.41%	0.35%	0.87%	1.14%
Commercial Portfolio Segment | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 0	$ 0	$ 0	$ 27
Commercial Portfolio Segment | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	666	625	1,613	1,853
Commercial Portfolio Segment | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	76	106	92	135
Commercial Portfolio Segment | Repayment Plan
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Commercial Portfolio Segment | Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	26	6	45	304
Commercial Portfolio Segment | Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	50	11	52	104
Commercial Portfolio Segment | Interest Rate Reduction and Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	15
Commercial Portfolio Segment | Interest Rate Reduction, Payment Delay, and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	12	0
Commercial Portfolio Segment | Other
Financing Receivable [Line Items]
Amortized cost basis, modified	105	16	156	85
Commercial Portfolio Segment | Commercial and industrial
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 653	$ 410	$ 1,296	$ 1,349
% of Loan Class	0.34%	0.23%	0.68%	0.75%
Commercial Portfolio Segment | Commercial and industrial | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 0	$ 0	$ 0	$ 27
Commercial Portfolio Segment | Commercial and industrial | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	452	372	1,009	927
Commercial Portfolio Segment | Commercial and industrial | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	47	19	63	34
Commercial Portfolio Segment | Commercial and industrial | Repayment Plan
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Commercial Portfolio Segment | Commercial and industrial | Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	26	6	45	157
Commercial Portfolio Segment | Commercial and industrial | Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	23	11	25	104
Commercial Portfolio Segment | Commercial and industrial | Interest Rate Reduction and Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	15
Commercial Portfolio Segment | Commercial and industrial | Interest Rate Reduction, Payment Delay, and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	12	0
Commercial Portfolio Segment | Commercial and industrial | Other
Financing Receivable [Line Items]
Amortized cost basis, modified	105	2	142	85
Commercial Portfolio Segment | Commercial real estate
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 270	$ 354	$ 674	$ 1,174
% of Loan Class	0.89%	1.01%	2.23%	3.34%
Commercial Portfolio Segment | Commercial real estate | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment | Commercial real estate | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	214	253	604	926
Commercial Portfolio Segment | Commercial real estate | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	29	87	29	101
Commercial Portfolio Segment | Commercial real estate | Repayment Plan
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Commercial Portfolio Segment | Commercial real estate | Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	147
Commercial Portfolio Segment | Commercial real estate | Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	27	0	27	0
Commercial Portfolio Segment | Commercial real estate | Interest Rate Reduction and Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Commercial Portfolio Segment | Commercial real estate | Interest Rate Reduction, Payment Delay, and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Commercial Portfolio Segment | Commercial real estate | Other
Financing Receivable [Line Items]
Amortized cost basis, modified	0	14	14	0
Consumer Portfolio Segment
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 110	$ 65	$ 221	$ 163
% of Loan Class	0.11%	0.06%	0.22%	0.16%
Consumer Portfolio Segment | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	1	1	6	5
Consumer Portfolio Segment | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	73	31	135	77
Consumer Portfolio Segment | Repayment Plan
Financing Receivable [Line Items]
Amortized cost basis, modified	18	22	50	58
Consumer Portfolio Segment | Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	1	0
Consumer Portfolio Segment | Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	1	1	4	3
Consumer Portfolio Segment | Interest Rate Reduction and Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Interest Rate Reduction, Payment Delay, and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Other
Financing Receivable [Line Items]
Amortized cost basis, modified	17	10	25	20
Consumer Portfolio Segment | Residential real estate
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 78	$ 33	$ 141	$ 79
% of Loan Class	0.17%	0.07%	0.32%	0.17%
Consumer Portfolio Segment | Residential real estate | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment | Residential real estate | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	1	1
Consumer Portfolio Segment | Residential real estate | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	71	28	130	67
Consumer Portfolio Segment | Residential real estate | Repayment Plan
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Residential real estate | Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Residential real estate | Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	1	1	4	3
Consumer Portfolio Segment | Residential real estate | Interest Rate Reduction and Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Residential real estate | Interest Rate Reduction, Payment Delay, and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Residential real estate | Other
Financing Receivable [Line Items]
Amortized cost basis, modified	6	4	6	8
Consumer Portfolio Segment | Home equity
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 14	$ 10	$ 29	$ 27
% of Loan Class	0.05%	0.04%	0.11%	0.10%
Consumer Portfolio Segment | Home equity | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment | Home equity | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Home equity | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	2	3	5	10
Consumer Portfolio Segment | Home equity | Repayment Plan
Financing Receivable [Line Items]
Amortized cost basis, modified	1	1	5	5
Consumer Portfolio Segment | Home equity | Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Home equity | Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Home equity | Interest Rate Reduction and Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Home equity | Interest Rate Reduction, Payment Delay, and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Home equity | Other
Financing Receivable [Line Items]
Amortized cost basis, modified	11	6	19	12
Consumer Portfolio Segment | Credit card
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 17	$ 21	$ 44	$ 52
% of Loan Class	0.26%	0.31%	0.66%	0.76%
Consumer Portfolio Segment | Credit card | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment | Credit card | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Credit card | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Credit card | Repayment Plan
Financing Receivable [Line Items]
Amortized cost basis, modified	17	21	44	52
Consumer Portfolio Segment | Credit card | Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Credit card | Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Credit card | Interest Rate Reduction and Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Credit card | Interest Rate Reduction, Payment Delay, and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Credit card | Other
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Education
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1	$ 1	$ 4	$ 4
% of Loan Class	0.07%	0.06%	0.26%	0.24%
Consumer Portfolio Segment | Education | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment | Education | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	1	1	4	4
Consumer Portfolio Segment | Education | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Education | Repayment Plan
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Education | Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Education | Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Education | Interest Rate Reduction and Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Education | Interest Rate Reduction, Payment Delay, and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	0
Consumer Portfolio Segment | Education | Other
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 0	$ 0	0	0
Consumer Portfolio Segment | Other consumer
Financing Receivable [Line Items]
Amortized cost basis, modified			$ 3	$ 1
% of Loan Class			0.07%	0.02%
Consumer Portfolio Segment | Other consumer | Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified			$ 0	$ 0
Consumer Portfolio Segment | Other consumer | Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified			1	0
Consumer Portfolio Segment | Other consumer | Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified			0	0
Consumer Portfolio Segment | Other consumer | Repayment Plan
Financing Receivable [Line Items]
Amortized cost basis, modified			1	1
Consumer Portfolio Segment | Other consumer | Payment Delay and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified			1	0
Consumer Portfolio Segment | Other consumer | Interest Rate Reduction and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified			0	0
Consumer Portfolio Segment | Other consumer | Interest Rate Reduction and Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified			0	0
Consumer Portfolio Segment | Other consumer | Interest Rate Reduction, Payment Delay, and Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified			0	0
Consumer Portfolio Segment | Other consumer | Other
Financing Receivable [Line Items]
Amortized cost basis, modified			$ 0	$ 0

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