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Investments - Distribution of Fixed-Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 305 |
Due after one year through five years | 1,256 |
Due after five years through 10 years | 1,835 |
Due after 10 years | 2,376 |
Amortized Cost | 6,565 | $ 6,746
Estimated Fair Value |  |
Due within one year | 307 |
Due after one year through five years | 1,244 |
Due after five years through 10 years | 1,801 |
Due after 10 years | 2,208 |
Estimated Fair Value | 6,284 | 6,307
RMBS |  |
Amortized Cost |  |
Amortized Cost | 613 | 428
Estimated Fair Value |  |
Estimated Fair Value | 544 | 342
CMBS |  |
Amortized Cost |  |
Amortized Cost | 180 | 157
Estimated Fair Value |  |
Estimated Fair Value | $ 180 | $ 151

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