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Investments (Fixed Maturity Securities AFS - Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value of Fixed Maturity Securities AFS	$ 304,645	$ 281,043
Gross Unrealized Gains (Losses)	$ (27,245)	$ (31,199)

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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