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Investments in 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, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 1,219
Due after one year through five years	12,048
Due after five years through ten years	7,416
Due after ten years	15,163
Amortized Cost	35,846
Debt securities, held-to-maturity, excluding accrued interest, before allowance for credit loss	46,480
Fair Value
Due in one year or less	1,218
Due after one year through five years	11,982
Due after five years through ten years	7,363
Due after ten years	15,221
Debt securities, available-for-sale, maturity, allocated and single maturity date, fair value	35,784
Debt securities, available-for-sale, excluding accrued interest	46,480	$ 12,877
Residential mortgage-backed securities
Amortized Cost
Debt securities, available-for-sale, maturity, without single maturity date, amortized cost	1,067
Fair Value
Debt securities, available -for-sale, maturity, without single maturity date, amortized cost	1,079
Debt securities, available-for-sale, excluding accrued interest	1,079	126
Commercial mortgage-backed securities
Amortized Cost
Debt securities, available-for-sale, maturity, without single maturity date, amortized cost	2,744
Fair Value
Debt securities, available -for-sale, maturity, without single maturity date, amortized cost	2,766
Debt securities, available-for-sale, excluding accrued interest	2,766	0
Collateralized debt securities
Amortized Cost
Debt securities, available-for-sale, maturity, without single maturity date, amortized cost	6,823
Fair Value
Debt securities, available -for-sale, maturity, without single maturity date, amortized cost	6,851
Debt securities, available-for-sale, excluding accrued interest	$ 6,851	$ 1,318

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