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Significant Accounting Policies - Deferred Acquisition Costs (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Deferred acquisition costs, beginning of the period | $ 1,502 | $ 1,219
Capitalizations | 134 | 135
Amortization expense | (76) | (64)
Deferred acquisition costs, end of the period | $ 1,560 | $ 1,290

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