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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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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 next rolling 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.

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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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