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Significant Accounting Policies - Deferred Acquisition Costs (Details) - USD ($) $ in Millions | 6 Months Ended
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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

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