Loans and Related Allowance for Credit Losses (Financial Effect of Loan Modification) (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
Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	667	626	1,619	1,858
Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	0	0	0	27
Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	149	137	227	212
Commercial and industrial \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 501	$ 389	$ 1,091	$ 1,188
Weighted average extended contract term	25 months	11 months	23 months	14 months
Commercial and industrial \| Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 23	$ 11	$ 37	$ 146
Weighted average interest rate reduction	3.41%	1.52%	2.57%	1.45%
Commercial and industrial \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 73	$ 25	$ 120	$ 206
Weighted average payment deferral term	2 months	3 months	6 months	8 months
Commercial real estate \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 241	$ 253	$ 631	$ 1,073
Weighted average extended contract term	6 months	17 months	14 months	15 months
Commercial real estate \| Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 27		$ 27
Weighted average interest rate reduction	1.04%		1.04%
Commercial real estate \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 29	$ 87	$ 29	$ 248
Weighted average payment deferral term	6 months	8 months	6 months	7 months
Residential real estate \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1	$ 1	$ 5	$ 4
Weighted average extended contract term	162 months	28 months	172 months	81 months
Residential real estate \| Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1	$ 1	$ 4	$ 3
Weighted average interest rate reduction	1.73%	1.48%	1.25%	0.83%
Residential real estate \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 71	$ 28	$ 130	$ 67
Weighted average payment deferral term	9 months	10 months	9 months	9 months
Education \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1	$ 1	$ 4	$ 4
Weighted average extended contract term	11 months	12 months	16 months	12 months
Home equity \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 2	$ 3	$ 5	$ 10
Weighted average payment deferral term	5 months	5 months	5 months	4 months
Other consumer \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified			$ 2
Weighted average extended contract term			32 months
Other consumer \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified			$ 1
Weighted average payment deferral term			24 months

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- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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