Investments (excluding Consolidated Investment Entities) - Fixed Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	$ 26,536	$ 27,690
Securities pledged, Amortized Cost	1,665	1,232
Allowance for credit losses	38	17	$ 12	$ 58
U.S. Treasuries
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	524	417
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	0	7
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	52	21
Embedded Derivatives	0	0
Allowance for credit losses	0	0
Fixed maturities, Fair Value	472	403
U.S. Government agencies and authorities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	29	54
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	1	3
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	0	1
Embedded Derivatives	0	0
Allowance for credit losses	0	0
Fixed maturities, Fair Value	30	56
State, municipalities, and political subdivisions
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	697	871
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	0	1
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	117	101
Embedded Derivatives	0	0
Allowance for credit losses	0	0
Fixed maturities, Fair Value	580	771
U.S. corporate public securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	7,938	8,402
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	124	168
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	1,054	904
Embedded Derivatives	0	0
Allowance for credit losses	0	0
Fixed maturities, Fair Value	7,008	7,666
U.S. corporate private securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	5,275	5,040
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	43	44
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	329	324
Embedded Derivatives	0	0
Allowance for credit losses	6	0	0
Fixed maturities, Fair Value	4,983	4,760
Foreign corporate public securities and foreign governments
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	2,729	2,928
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	32	47
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	287	270
Embedded Derivatives	0	0
Allowance for credit losses	2	3	9
Fixed maturities, Fair Value	2,472	2,702
Foreign corporate private securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	2,693	2,916
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	22	27
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	169	129
Embedded Derivatives	0	0
Allowance for credit losses	9	2	2
Fixed maturities, Fair Value	2,537	2,812
Residential mortgage-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	3,709	3,695
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	27	36
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	261	257
Embedded Derivatives	(4)	2
Allowance for credit losses	0	0
Fixed maturities, Fair Value	3,471	3,476
Commercial mortgage-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	3,677	4,147
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	4	1
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	532	644
Embedded Derivatives	0	0
Allowance for credit losses	17	9	$ 0
Fixed maturities, Fair Value	3,132	3,495
Other asset-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	2,779	2,528
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	39	16
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	45	71
Embedded Derivatives	0	0
Allowance for credit losses	4	3
Fixed maturities, Fair Value	2,769	2,470
Fixed maturities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	30,050	30,998
Total fixed maturities, less securities pledged, Amortized Cost	28,385	29,766
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	292	350
Total fixed maturities, less securities pledged, Gross Unrealized Capital Gains	292	350
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	2,846	2,722
Total fixed maturities, less securities pledged, Gross Unrealized Capital Losses	2,697	2,650
Embedded Derivatives	(4)	2
Allowance for credit losses	38	17
Fixed maturities, Fair Value	27,454	28,611
Total fixed maturities, less securities pledged, Fair Value	25,938	27,451
Collateral pledged
Available-for-sale Securities, Including Securities Pledged [Line Items]
Securities pledged	1,523	1,160
Collateral pledged | Fixed maturities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Securities pledged, Amortized Cost	1,665	1,232
Securities pledged, Gross Unrealized Capital Gains	0	0
Securities pledged, Gross Unrealized Capital Losses	149	72
Embedded Derivatives	0	0
Allowance for credit losses	0	0
Securities pledged	$ 1,516	$ 1,160