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Loans and Related Allowance for Credit Losses (Narrative) (Details) $ in Millions	Sep. 30, 2025 USD ($) portfolio_segment	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Number of portfolio segments | portfolio_segment	2
Financing receivable, after allowance for credit loss	$ 322,138	$ 311,981
Allowance for credit loss	5,253	5,200	$ 5,314
Federal Reserve Bank | Asset Pledged as Collateral without Right
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, after allowance for credit loss	46,100	43,400
Federal Home Loan Bank | Asset Pledged as Collateral without Right
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, after allowance for credit loss	$ 80,000	$ 89,000

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