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Contracts Accounted for as Insurance - Deferred Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Beginning of period $ 147 $ 131 $ 119
Costs deferred during the period 27 30 26
Costs amortized during the period (13) (14) (14)
End of period $ 161 $ 147 $ 131