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Significant Accounting Policies - Deferred Acquisition Costs (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Deferred acquisition costs, beginning of the period $ 1,747 $ 1,502
Capitalization 262 271
Amortization expense (172) (146)
Deferred acquisition costs, end of the period $ 1,837 $ 1,627