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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	Dec. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 1,354
Due after one year through five years	14,770
Due after five years through ten years	6,666
Due after ten years	14,835
Debt securities, available-for-sale, maturity, allocated and single maturity date, amortized cost, total	37,625
Amortized cost	47,127
Fair Value
Due in one year or less	1,356
Due after one year through five years	14,801
Due after five years through ten years	6,657
Due after ten years	14,868
Debt securities, available-for-sale, maturity, allocated and single maturity date, fair value, total	37,682
Fair Value	47,292	$ 12,877
Residential mortgage-backed securities
Amortized Cost
Mortgage-backed securities	1,086
Fair Value
Mortgage-backed securities	1,106
Fair Value	1,106	126
Commercial mortgage-backed securities
Amortized Cost
Mortgage-backed securities	2,755
Fair Value
Mortgage-backed securities	2,796
Fair Value	2,796	0
Collateralized debt securities
Amortized Cost
Mortgage-backed securities	5,661
Fair Value
Mortgage-backed securities	5,708
Fair Value	$ 5,708	$ 1,318

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