Investments - Debt Maturities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed Maturities, single issuers in excess of total equity	no
Embedded derivatives - fixed maturities
Available-for-sale Securities Including Securities Pledged [Line Items]
One year or less, Amortized Cost	$ 488
One year or less, Fair Value	485
After one year through five years, Amortized Cost	3,292
After one year through five years, Fair Value	3,144
After five years through ten years, Amortized Cost	3,228
After five years through ten years, Fair Value	3,055
After ten years, Amortized Cost	9,555
After ten years, Fair Value	8,407
Amortized Cost	23,966	$ 24,367
Fixed maturities, including securities pledged	$ 21,926	$ 21,819
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	51.60%	46.90%
Without single maturity date, Amortized Cost	$ 5,924
Without single maturity date, Fair Value	5,452
Other asset-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Without single maturity date, Amortized Cost	1,479
Without single maturity date, Fair Value	1,383
Amortized Cost	1,479	$ 1,418
Fixed maturities, including securities pledged	$ 1,383	$ 1,310