Loans and Related Allowance for Credit Losses (Financial Effect of Loan Modification) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1,010	$ 1,326	$ 1,660	$ 2,233
Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	820	827	1,343	1,502
Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	0	18	0	18
Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	137	129	157	171
Commercial and industrial \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 568	$ 539	$ 828	$ 941
Weighted average extended contract term	11 months	15 months	17 months	14 months
Commercial and industrial \| Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1	$ 120	$ 16	$ 145
Weighted average interest rate reduction	5.50%	1.12%	1.17%	1.64%
Commercial and industrial \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 54	$ 159	$ 69	$ 207
Weighted average payment deferral term	5 months	5 months	12 months	7 months
Commercial real estate \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 268	$ 538	$ 550	$ 927
Weighted average extended contract term	16 months	14 months	16 months	14 months
Commercial real estate \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 35	$ 84	$ 35	$ 173
Weighted average payment deferral term	6 months	23 months	6 months	9 months
Residential real estate \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified		$ 1	$ 2	$ 1
Weighted average extended contract term		105 months	221 months	98 months
Residential real estate \| Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified		$ 1	$ 1	$ 1
Weighted average interest rate reduction		1.30%		1.15%
Weighted average interest rate increase			0.38%
Residential real estate \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 64	$ 30	$ 88	$ 55
Weighted average payment deferral term	6 months	10 months	6 months	9 months
Education \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1	$ 1	$ 3	$ 3
Weighted average extended contract term	25 months	16 months	17 months	12 months
Home equity \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1	$ 5	$ 3	$ 8
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	$ 1		$ 2
Weighted average extended contract term	44 months		32 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 Interest Rate Increase from Modification

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- Definition

Financing Receivable, Modified, Weighted Average Payment Deferral

+ References

No definition available.

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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
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-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.

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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.

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