Derivative Financial Instruments - Risk Ratings of the Notional Amount of Risk Participation Agreements (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value
Notional amount of the risk participations agreements	$ 3,483	$ 3,563
Pass
Derivatives, Fair Value
Notional amount of the risk participations agreements	3,162	3,168
Special mention
Derivatives, Fair Value
Notional amount of the risk participations agreements	206	323
Substandard
Derivatives, Fair Value
Notional amount of the risk participations agreements	$ 115	$ 72