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Derivatives - Offsetting Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Offsetting    
Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet $ 40 $ 106
Gross Amount of Eligible Offsetting Recognized Derivative Assets 20 11
Cash Collateral Pledged 0 0
Net Amount of Derivative Liabilities $ 20 $ 95