Investments - Debt Maturities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Embedded derivatives - fixed maturities
Available-for-sale Securities Including Securities Pledged [Line Items]
One year or less, Amortized Cost	$ 510
One year or less, Fair Value	493
After one year through five years, Amortized Cost	3,192
After one year through five years, Fair Value	3,104
After five years through ten years, Amortized Cost	3,825
After five years through ten years, Fair Value	3,616
After ten years, Amortized Cost	9,904
After ten years, Fair Value	8,974
Amortized Cost	24,881	$ 24,327
Fixed maturities, including securities pledged	$ 23,286	$ 26,412
Mortgage-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Percent Collateralized Mortgage Backed Securities including Interest-Only Strip or Principal-Only Strip	43.70%	45.10%
Without single maturity date, Amortized Cost	$ 6,091
Without single maturity date, Fair Value	5,829
Other asset-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Without single maturity date, Amortized Cost	1,359
Without single maturity date, Fair Value	1,270
Amortized Cost	1,359	$ 1,341
Fixed maturities, including securities pledged	$ 1,270	$ 1,351