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Investments - Distribution of Fixed-Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Estimated Fair Value |  |
Estimated Fair Value | $ 8,156 | $ 8,202
Fixed-maturity securities, available-for-sale |  |
Amortized Cost |  |
Due within one year | 202 |
Due after one year through five years | 1,956 |
Due after five years through 10 years | 1,869 |
Due after 10 years | 3,442 |
Amortized Cost | 8,227 | 7,822
Estimated Fair Value |  |
Due within one year | 203 |
Due after one year through five years | 1,948 |
Due after five years through 10 years | 1,853 |
Due after 10 years | 3,430 |
Estimated Fair Value | 8,156 | 8,202
Fixed-maturity securities, available-for-sale | RMBS |  |
Amortized Cost |  |
Amortized Cost | 437 | 454
Estimated Fair Value |  |
Estimated Fair Value | 400 | 437
Fixed-maturity securities, available-for-sale | CMBS |  |
Amortized Cost |  |
Amortized Cost | 321 | 332
Estimated Fair Value |  |
Estimated Fair Value | $ 322 | $ 346

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- Definition Amortized cost of investment in debt security, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in rolling sixth through tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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