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Significant Accounting Policies - Deferred Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Deferred acquisition costs, beginning of the period $ 879 $ 519
Capitalizations 564 529
Amortization expense (224) (169)
Deferred acquisition costs, end of the period $ 1,219 $ 879