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Investments - Distribution of Fixed-Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 206 |
Due after one year through five years | 1,295 |
Due after five years through 10 years | 2,100 |
Due after 10 years | 2,341 |
Amortized Cost | 6,774 | $ 6,827
Estimated Fair Value |  |
Due within one year | 205 |
Due after one year through five years | 1,269 |
Due after five years through 10 years | 2,027 |
Due after 10 years | 2,163 |
Estimated Fair Value | 6,415 | 6,369
RMBS |  |
Amortized Cost |  |
Amortized Cost | 649 | 657
Estimated Fair Value |  |
Estimated Fair Value | 569 | 567
CMBS |  |
Amortized Cost |  |
Amortized Cost | 183 | 189
Estimated Fair Value |  |
Estimated Fair Value | $ 182 | $ 186

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