Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities pledged, amortized costs	$ 864	$ 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	$ 564	554
Fixed maturities, Gross Unrealized Capital Gains	13	137
Fixed maturities, Gross Unrealized Capital Losses	28	0
Embedded Derivatives	0	0
Fair Value	549	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	3	0
Embedded Derivatives	0	0
Fair Value	17	20
OTTI	0	0
State, municipalities and political subdivisions
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	705	716
Fixed maturities, Gross Unrealized Capital Gains	1	88
Fixed maturities, Gross Unrealized Capital Losses	90	1
Embedded Derivatives	0	0
Fair Value	616	803
OTTI	0	0
U.S. corporate public securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	7,396	7,314
Fixed maturities, Gross Unrealized Capital Gains	31	994
Fixed maturities, Gross Unrealized Capital Losses	1,198	39
Embedded Derivatives	0	0
Fair Value	6,228	8,269
OTTI	1	0
U.S. corporate private securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	3,841	3,620
Fixed maturities, Gross Unrealized Capital Gains	6	334
Fixed maturities, Gross Unrealized Capital Losses	381	15
Embedded Derivatives	0	0
Fair Value	3,466	3,939
OTTI	0	0
Foreign corporate public securities and foreign governments
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,382	2,352
Fixed maturities, Gross Unrealized Capital Gains	5	253
Fixed maturities, Gross Unrealized Capital Losses	376	14
Embedded Derivatives	0	0
Fair Value	2,002	2,591
OTTI	9	0
Foreign corporate private securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,686	2,563
Fixed maturities, Gross Unrealized Capital Gains	2	188
Fixed maturities, Gross Unrealized Capital Losses	250	1
Embedded Derivatives	0	0
Fair Value	2,426	2,703
OTTI	12	47
Residential mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	3,028	3,081
Fixed maturities, Gross Unrealized Capital Gains	24	97
Fixed maturities, Gross Unrealized Capital Losses	153	20
Embedded Derivatives	2	7
Fair Value	2,899	3,164
OTTI	2	1
Commercial mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,997	2,766
Fixed maturities, Gross Unrealized Capital Gains	3	130
Fixed maturities, Gross Unrealized Capital Losses	310	15
Embedded Derivatives	0	0
Fair Value	2,689	2,881
OTTI	1	0
Other asset-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	1,413	1,341
Fixed maturities, Gross Unrealized Capital Gains	1	16
Fixed maturities, Gross Unrealized Capital Losses	127	6
Embedded Derivatives	0	0
Fair Value	1,286	1,351
OTTI	1	0
Embedded derivatives - fixed maturities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	25,032	24,327
Fixed maturities, Gross Unrealized Capital Gains	86	2,237
Fixed maturities, Gross Unrealized Capital Losses	2,916	111
Embedded Derivatives	2	7
Fair Value	22,178	26,412
OTTI	26	48
Total fixed maturities, less securities pledged, Amortized Cost	24,168	23,602
Total fixed maturities, less securities pledged, Gross Unrealized Capital Gains	81	2,163
Total fixed maturities, less securities pledged, Gross Unrealized Capital Losses	2,797	111
Total fixed maturities, less securities pledged, Fair Value	21,428	25,613
Collateral Pledged
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities pledged	750	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	864	725
Securities pledged, Gross Unrealized Capital Gains	5	74
Securities pledged, Gross Unrealized Capital Losses	119	0
Securities pledged	$ 750	$ 799