Derivative Financial Instruments - Risk Ratings of the Notional Amount of Risk Participation Agreements (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value
Notional amount of the risk participations agreements	$ 3,247	$ 3,563
Pass
Derivatives, Fair Value
Notional amount of the risk participations agreements	3,138	3,168
Special mention
Derivatives, Fair Value
Notional amount of the risk participations agreements	9	323
Substandard
Derivatives, Fair Value
Notional amount of the risk participations agreements	$ 100	$ 72