Loans and Related Allowance for Credit Losses (Financial Effect of Loan Modification) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 829	$ 904	$ 2,686	$ 1,946
Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	626	664	1,858	1,452
Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified		16	27	16
Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	137	105	212	196
Commercial and industrial \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 389	$ 363	$ 1,188	$ 724
Weighted average extended contract term	11 months	13 months	14 months	12 months
Commercial and industrial \| Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 11	$ 15	$ 146	$ 15
Weighted average interest rate reduction	1.52%	0.25%	1.45%	0.25%
Commercial and industrial \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 25	$ 44	$ 206	$ 111
Weighted average payment deferral term	3 months	6 months	8 months	6 months
Commercial real estate \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 253	$ 307	$ 1,073	$ 745
Weighted average extended contract term	17 months	13 months	15 months	16 months
Commercial real estate \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 87	$ 16	$ 248	$ 16
Weighted average payment deferral term	8 months	8 months	7 months	8 months
Residential real estate \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1		$ 4	$ 3
Weighted average extended contract term	28 months		81 months	118 months
Residential real estate \| Interest Rate Reduction
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1	$ 1	$ 3	$ 4
Weighted average interest rate reduction	1.48%	0.72%	0.83%	1.13%
Residential real estate \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 28	$ 50	$ 67	$ 83
Weighted average payment deferral term	10 months	10 months	9 months	9 months
Education \| Term Extension
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 1	$ 1	$ 4	$ 3
Weighted average extended contract term	12 months	15 months	12 months	16 months
Home equity \| Payment Delay
Financing Receivable [Line Items]
Amortized cost basis, modified	$ 3	$ 2	$ 10	$ 6
Weighted average payment deferral term	5 months	5 months	4 months	4 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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- 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.

+ References

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