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Investments - Reverse Repurchase Agreements (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]    
Securities Purchased under Agreements to Resell $ 1,640 $ 0
Securities Purchased under Agreements to Resell, Fair Value of Collateral $ 1,753 $ 0