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Investments - Distribution of Fixed-Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 289 |
Due after one year through five years | 1,636 |
Due after five years through 10 years | 1,720 |
Due after 10 years | 3,018 |
Amortized Cost | 7,359 | $ 7,707
Estimated Fair Value |  |
Due within one year | 283 |
Due after one year through five years | 1,531 |
Due after five years through 10 years | 1,636 |
Due after 10 years | 2,811 |
Estimated Fair Value | 6,869 | 7,119
RMBS |  |
Amortized Cost |  |
Amortized Cost | 429 | 418
Estimated Fair Value |  |
Estimated Fair Value | 350 | 340
CMBS |  |
Amortized Cost |  |
Amortized Cost | 267 | 282
Estimated Fair Value |  |
Estimated Fair Value | $ 258 | $ 271

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