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Derivative Instruments (Collateral Support Agreements) (Details) - Credit Default Swap, Seller [Member] - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Credit risk related contingent features collateral    
Maximum potential payout $ 51 $ 55
Less: Counterparty thresholds
Maximum collateral potentially required to post $ 51 $ 55