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Financial Derivatives (Credit-Risk Contingent Features) (Details) - USD ($)
$ in Billions
Sep. 30, 2024
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Net derivative liabilities with credit-risk contingent features $ 3.1 $ 4.2
Less: Collateral posted 0.9 1.0
Maximum additional amount of collateral exposure $ 2.2 $ 3.2