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Contracts Accounted for as Insurance - Deferred Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Beginning of period $ 161 $ 147 $ 131
Costs deferred during the period 35 27 30
Costs amortized during the period (20) (13) (14)
End of period $ 176 $ 161 $ 147