Loans and Related Allowance for Credit Losses (Financial Effect of Loan Modification) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1,096	$ 1,196
Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	829	832
Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	103	186
Commercial and industrial \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 486	$ 480
Weighted average extended contract term	16 months	11 months
Commercial and industrial \| Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 15	$ 24
Weighted average interest rate reduction	1.00%	4.06%
Commercial and industrial \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 87	$ 126
Weighted average payment deferral term	3 months	5 months
Commercial real estate \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 355	$ 452
Weighted average extended contract term	12 months	12 months
Commercial real estate \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified		$ 121
Weighted average payment deferral term		8 months
Residential real estate \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 2
Weighted average extended contract term	233 months
Residential real estate \| Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1
Weighted average interest rate reduction	1.21%
Residential real estate \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 27	$ 40
Weighted average payment deferral term	6 months	8 months
Education \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 2	$ 2
Weighted average extended contract term	11 months	10 months
Home equity \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 2	$ 5
Weighted average payment deferral term	5 months	4 months
Other consumer \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1
Weighted average extended contract term	24 months
Other consumer \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1
Weighted average payment deferral term	24 months

Financing Receivable, Modified, Weighted Average Payment Deferral

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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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-Topic 310
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-Name Accounting Standards Codification
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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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- Definition

Percentage of decrease in weighted average contractual interest rate of financing receivable modified for debtor experiencing financial difficulty.

+ References

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- Definition

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.

+ References

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