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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	Jun. 30, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 1,711
Due after one year through five years	16,509
Due after five years through ten years	5,284
Due after ten years	15,370
Debt securities, available-for-sale, maturity, allocated and single maturity date, amortized cost, total	38,874
Amortized Cost	48,260	$ 47,127
Fair Value
Due in one year or less	1,713
Due after one year through five years	16,774
Due after five years through ten years	5,426
Due after ten years	15,507
Debt securities, available-for-sale, maturity, allocated and single maturity date, fair value, total	39,420
Fair Value	48,931	47,292
Residential mortgage-backed securities
Amortized Cost
Mortgage-backed securities	966
Amortized Cost	966	1,086
Fair Value
Mortgage-backed securities	999
Fair Value	999	1,106
Commercial mortgage-backed securities
Amortized Cost
Mortgage-backed securities	3,196
Amortized Cost	3,196	2,755
Fair Value
Mortgage-backed securities	3,259
Fair Value	3,259	2,796
Collateralized debt securities
Amortized Cost
Mortgage-backed securities	5,224
Amortized Cost	5,224	5,661
Fair Value
Mortgage-backed securities	5,253
Fair Value	$ 5,253	$ 5,708

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