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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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