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Derivative Instruments and Hedging Activities Credit Risk-Related Contingent Features (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Derivative Liability $ 19  
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 19  
Derivative, Net Liability Position, Aggregate Fair Value $ 770 $ 424