Loans and Related Allowance for Credit Losses (Financial Effect of Commercial FDMs) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Commercial and industrial \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 358	$ 568	$ 593	$ 828
Weighted average extended contract term	16 months	11 months	15 months	17 months
Commercial and industrial \| Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1	$ 1	$ 2	$ 16
Weighted average interest rate reduction	4.61%	5.50%	4.07%	1.17%
Commercial and industrial \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 117	$ 54	$ 144	$ 69
Weighted average payment deferral term	4 months	5 months	8 months	12 months
Commercial real estate \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 729	$ 268	$ 999	$ 550
Weighted average extended contract term	14 months	16 months	15 months	16 months
Commercial real estate \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 32	$ 35	$ 94	$ 35
Weighted average payment deferral term	6 months	6 months	7 months	6 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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-Topic 310
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-Name Accounting Standards Codification
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-Paragraph 42
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-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
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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 reported fact of one year, five months, and thirteen days.

+ References

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