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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, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 1,371
Due after one year through five years	11,414
Due after five years through ten years	6,985
Due after ten years	14,073
Debt securities, available-for-sale, maturity, allocated and single maturity date, amortized cost	33,843
Debt securities, held-to-maturity, excluding accrued interest, before allowance for credit loss	43,949
Fair Value
Due in one year or less	1,376
Due after one year through five years	11,637
Due after five years through ten years	7,246
Due after ten years	15,104
Debt securities, available-for-sale, maturity, allocated and single maturity date, fair value	35,363
Debt securities, available-for-sale, excluding accrued interest	45,683	$ 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	1,120
Debt securities, available-for-sale, excluding accrued interest	1,120	126
Commercial mortgage-backed securities
Amortized Cost
Debt securities, available-for-sale, maturity, without single maturity date, amortized cost	2,710
Fair Value
Debt securities, available -for-sale, maturity, without single maturity date, amortized cost	2,792
Debt securities, available-for-sale, excluding accrued interest	2,792	0
Collateralized debt securities
Amortized Cost
Debt securities, available-for-sale, maturity, without single maturity date, amortized cost	6,329
Fair Value
Debt securities, available -for-sale, maturity, without single maturity date, amortized cost	6,408
Debt securities, available-for-sale, excluding accrued interest	$ 6,408	$ 1,318

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