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Loans and Related Allowance for Credit Losses (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) portfolio_segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Number of portfolio segments | portfolio_segment	2
Financing receivable, after allowance for credit loss	$ 316,717	$ 321,284
Subsequently defaulted FDM/TDR		100	$ 100
Allowance for credit loss and off-balance sheet liability	$ 5,454	5,435	$ 5,530
Short-Term Repayment Plan
Financing Receivable, Credit Quality Indicator [Line Items]
Weighted-Average Interest Rate Reduction	4.99%
Fully-amortized Repayment Plans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable program term	60 months
Weighted-Average Interest Rate Reduction	4.99%
Minimum | Short-Term Repayment Plan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable program term	6 months
Financing receivable minimum payment percentage	1.90%
Minimum | Fully-amortized Repayment Plans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable minimum payment percentage	1.90%
Maximum | Short-Term Repayment Plan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable program term	12 months
Federal Reserve Bank | Asset Pledged as Collateral without Right
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, after allowance for credit loss	$ 51,300	28,100
Federal Home Loan Bank | Asset Pledged as Collateral without Right
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, after allowance for credit loss	$ 89,500	$ 90,400

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Total allowance for credit losses related to loans, including the allowance for loan and lease losses and allowance for unfunded lending related commitments

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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

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-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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-Topic 310
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