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Derivative Financial Instruments - Risk Ratings of the Notional Amount of Risk Participation Agreements (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Derivatives, Fair Value    
Notional amount of the risk participations agreements $ 3,710 $ 3,780
Pass    
Derivatives, Fair Value    
Notional amount of the risk participations agreements 3,676 3,733
Special mention    
Derivatives, Fair Value    
Notional amount of the risk participations agreements 0 13
Substandard    
Derivatives, Fair Value    
Notional amount of the risk participations agreements $ 34 $ 34