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Investments - Distribution of Fixed-Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 248 |
Due after one year through five years | 1,526 |
Due after five years through 10 years | 1,760 |
Due after 10 years | 2,809 |
Amortized Cost | 6,971 | $ 7,707
Estimated Fair Value |  |
Due within one year | 239 |
Due after one year through five years | 1,406 |
Due after five years through 10 years | 1,629 |
Due after 10 years | 2,475 |
Estimated Fair Value | 6,267 | 7,119
RMBS |  |
Amortized Cost |  |
Amortized Cost | 430 | 418
Estimated Fair Value |  |
Estimated Fair Value | 330 | 340
CMBS |  |
Amortized Cost |  |
Amortized Cost | 198 | 282
Estimated Fair Value |  |
Estimated Fair Value | $ 188 | $ 271

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