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Available-For-Sale Fixed Maturity Securities - Amortized Cost and Fair Value, by Contractual Maturity, of Available-for-Sale Fixed Maturity Securities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 1,888
Due after one year through five years	20,040
Due after five years through ten years	7,854
Due after ten years	15,148
Debt securities, available-for-sale, maturity, allocated and single maturity date, amortized cost, total	44,930
Amortized Cost	54,104	$ 47,127
Fair Value
Due in one year or less	1,894
Due after one year through five years	20,434
Due after five years through ten years	8,052
Due after ten years	15,668
Debt securities, available-for-sale, maturity, allocated and single maturity date, fair value, total	46,048
Fair Value	55,408	47,292
Residential mortgage-backed securities
Amortized Cost
Mortgage-backed securities	953
Amortized Cost	953	1,086
Fair Value
Mortgage-backed securities	992
Fair Value	992	1,106
Commercial mortgage-backed securities
Amortized Cost
Mortgage-backed securities	3,219
Amortized Cost	3,219	2,755
Fair Value
Mortgage-backed securities	3,291
Fair Value	3,291	2,796
Collateralized debt securities
Amortized Cost
Mortgage-backed securities	5,002
Amortized Cost	5,002	5,661
Fair Value
Mortgage-backed securities	5,077
Fair Value	$ 5,077	$ 5,708

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