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Derivative and Hedging Activities - Narrative (Details)
$ in Millions
Sep. 30, 2020
USD ($)
Dec. 31, 2019
derivative
Derivative [Line Items]    
Expected amount to be transferred of during the next 12 months | $ $ 16  
Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative, number of instruments held | derivative   0