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Derivatives - Offsetting Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Offsetting    
Gross Amount of Derivative Assets Presented in the Consolidated Balance Sheet $ 84 $ 44
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities 20 11
Cash Collateral Received 0 0
Net Amount of Derivative Assets $ 64 $ 33