Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities pledged, amortized costs	$ 849	$ 725
Fixed Maturities, single issuers in excess of total equity	no
U.S. Treasuries
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	$ 559	554
Fixed maturities, Gross Unrealized Capital Gains	50	137
Fixed maturities, Gross Unrealized Capital Losses	14	0
Embedded Derivatives	0	0
Fair Value	595	691
OTTI	0	0
US Treasury and Government
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	20	20
Fixed maturities, Gross Unrealized Capital Gains	0	0
Fixed maturities, Gross Unrealized Capital Losses	2	0
Embedded Derivatives	0	0
Fair Value	18	20
OTTI	0	0
State, municipalities and political subdivisions
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	708	716
Fixed maturities, Gross Unrealized Capital Gains	4	88
Fixed maturities, Gross Unrealized Capital Losses	47	1
Embedded Derivatives	0	0
Fair Value	665	803
OTTI	0	0
U.S. corporate public securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	7,337	7,314
Fixed maturities, Gross Unrealized Capital Gains	124	994
Fixed maturities, Gross Unrealized Capital Losses	776	39
Embedded Derivatives	0	0
Fair Value	6,684	8,269
OTTI	1	0
U.S. corporate private securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	3,743	3,620
Fixed maturities, Gross Unrealized Capital Gains	24	334
Fixed maturities, Gross Unrealized Capital Losses	231	15
Embedded Derivatives	0	0
Fair Value	3,536	3,939
OTTI	0	0
Foreign corporate public securities and foreign governments
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,372	2,352
Fixed maturities, Gross Unrealized Capital Gains	25	253
Fixed maturities, Gross Unrealized Capital Losses	244	14
Embedded Derivatives	0	0
Fair Value	2,135	2,591
OTTI	18	0
Foreign corporate private securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,692	2,563
Fixed maturities, Gross Unrealized Capital Gains	11	188
Fixed maturities, Gross Unrealized Capital Losses	136	1
Embedded Derivatives	0	0
Fair Value	2,554	2,703
OTTI	13	47
Residential mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	3,154	3,081
Fixed maturities, Gross Unrealized Capital Gains	36	97
Fixed maturities, Gross Unrealized Capital Losses	107	20
Embedded Derivatives	3	7
Fair Value	3,086	3,164
OTTI	0	1
Commercial mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,937	2,766
Fixed maturities, Gross Unrealized Capital Gains	7	130
Fixed maturities, Gross Unrealized Capital Losses	200	15
Embedded Derivatives	0	0
Fair Value	2,743	2,881
OTTI	1	0
Other asset-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	1,359	1,341
Fixed maturities, Gross Unrealized Capital Gains	1	16
Fixed maturities, Gross Unrealized Capital Losses	90	6
Embedded Derivatives	0	0
Fair Value	1,270	1,351
OTTI	0	0
Embedded derivatives - fixed maturities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	24,881	24,327
Fixed maturities, Gross Unrealized Capital Gains	282	2,237
Fixed maturities, Gross Unrealized Capital Losses	1,847	111
Embedded Derivatives	3	7
Fair Value	23,286	26,412
OTTI	33	48
Total fixed maturities, less securities pledged, Amortized Cost	24,032	23,602
Total fixed maturities, less securities pledged, Gross Unrealized Capital Gains	268	2,163
Total fixed maturities, less securities pledged, Gross Unrealized Capital Losses	1,783	111
Total fixed maturities, less securities pledged, Fair Value	22,487	25,613
Collateral Pledged
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities pledged	799	799
Securities Sold under Agreements to Repurchase, Asset	0
Collateral Pledged | Embedded derivatives - fixed maturities
Available-for-sale Securities Including Securities Pledged [Line Items]
Embedded Derivatives	0	0
OTTI	0	0
Securities pledged, amortized costs	849	725
Securities pledged, Gross Unrealized Capital Gains	14	74
Securities pledged, Gross Unrealized Capital Losses	64	0
Securities pledged	$ 799	$ 799