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Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 13,340
Amortized Cost, Due after one year through five years	48,408
Amortized Cost, Due after five years through ten years	53,523
Amortized Cost, Due after ten years	132,353
Amortized Cost, Structured Securities	76,961
Amortized Cost, net of ACL	324,585
Estimated Fair Value, Due in one year or less	13,395
Estimated Fair Value, Due after one year through five years	48,936
Estimated Fair Value, Due after five years through ten years	53,548
Estimated Fair Value, Due after ten years	113,587
Estimated Fair Value, Structured Securities	75,179
Estimated Fair Value of Fixed Maturity Securities AFS	$ 304,645	$ 281,043

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