Derivative Financial Instruments - Risk Ratings of the Notional Amount of Risk Participation Agreements (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value
Notional amount of the risk participations agreements	$ 3,897	$ 3,710
Pass
Derivatives, Fair Value
Notional amount of the risk participations agreements	3,539	3,597
Special mention
Derivatives, Fair Value
Notional amount of the risk participations agreements	286	81
Substandard
Derivatives, Fair Value
Notional amount of the risk participations agreements	$ 72	$ 32