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Derivative and Hedging Activities (Details Textuals) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance Sheet Recording of Fair Value Hedge [Line Items]      
Additional Collateral, Aggregate Fair Value $ 78 $ 72  
Derivative collateral right to reclaim cash 18 $ 31  
Designated as Hedging Instrument      
Balance Sheet Recording of Fair Value Hedge [Line Items]      
Derivative Liability Notional Amount, Terminated     $ 500
Underlying Hedged Asset, Amortized Cost Basis 446    
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge $ 2