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Investments (excluding Consolidated Investment Entities) - Fixed Maturities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	$ 28,336	$ 26,536
Securities pledged, Amortized Cost	1,506	1,665
Fixed maturities, allowance for credit losses	51	38	$ 17
Collateral Pledged
Schedule of Available for Sale, including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Restricted	1,397	1,523
U.S. Treasuries
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	590	524
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	2	0
Fixed maturities, including securities pledged, Gross Unrealized Capital Losses	43	52
Embedded Derivatives	0	0
Fixed maturities, allowance for credit losses	0	0
Fixed maturities, including securities pledged, Fair Value	549	472
US Government Agencies Debt Securities
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	30	29
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	1	1
Fixed maturities, including securities pledged, Gross Unrealized Capital Losses	0	0
Embedded Derivatives	0	0
Fixed maturities, allowance for credit losses	0	0
Fixed maturities, including securities pledged, Fair Value	31	30
State, municipalities and political subdivisions
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	614	697
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	0	0
Fixed maturities, including securities pledged, Gross Unrealized Capital Losses	96	117
Embedded Derivatives	0	0
Fixed maturities, allowance for credit losses	0	0
Fixed maturities, including securities pledged, Fair Value	518	580
U.S. corporate public securities
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	8,444	7,938
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	189	124
Fixed maturities, including securities pledged, Gross Unrealized Capital Losses	864	1,054
Embedded Derivatives	0	0
Fixed maturities, allowance for credit losses	0	0
Fixed maturities, including securities pledged, Fair Value	7,769	7,008
U.S. corporate private securities
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	5,625	5,275
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	89	43
Fixed maturities, including securities pledged, Gross Unrealized Capital Losses	205	329
Embedded Derivatives	0	0
Fixed maturities, allowance for credit losses	2	6	0
Fixed maturities, including securities pledged, Fair Value	5,507	4,983
Foreign corporate public securities and foreign governments
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	2,899	2,729
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	72	32
Fixed maturities, including securities pledged, Gross Unrealized Capital Losses	207	287
Embedded Derivatives	0	0
Fixed maturities, allowance for credit losses	2	2	3
Fixed maturities, including securities pledged, Fair Value	2,762	2,472
Foreign corporate private securities
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	2,879	2,693
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	62	22
Fixed maturities, including securities pledged, Gross Unrealized Capital Losses	55	169
Embedded Derivatives	0	0
Fixed maturities, allowance for credit losses	42	9	2
Fixed maturities, including securities pledged, Fair Value	2,844	2,537
Residential mortgage-backed
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	4,355	3,709
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	51	27
Fixed maturities, including securities pledged, Gross Unrealized Capital Losses	208	261
Embedded Derivatives	(3)	4
Fixed maturities, allowance for credit losses	0	0
Fixed maturities, including securities pledged, Fair Value	4,201	3,471
Commercial mortgage-backed securities
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	3,248	3,677
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	5	4
Fixed maturities, including securities pledged, Gross Unrealized Capital Losses	430	532
Embedded Derivatives	0	0
Fixed maturities, allowance for credit losses	0	17	9
Fixed maturities, including securities pledged, Fair Value	2,823	3,132
Other asset-backed securities
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	2,888	2,779
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	30	39
Fixed maturities, including securities pledged, Gross Unrealized Capital Losses	34	45
Embedded Derivatives	0	0
Fixed maturities, allowance for credit losses	5	4	$ 3
Fixed maturities, including securities pledged, Fair Value	2,879	2,769
Fixed maturities
Schedule of Available for Sale, including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	31,572	30,050
Total fixed maturities, less securities pledged, Amortized Cost	30,066	28,385
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	501	292
Total fixed maturities, less securities pledged, Gross Unrealized Capital Gains	501	292
Fixed maturities, including securities pledged, Gross Unrealized Capital Losses	2,142	2,846
Total fixed maturities, less securities pledged, Gross Unrealized Capital Losses	2,033	2,697
Embedded Derivatives	3	(4)
Fixed maturities, allowance for credit losses	51	38
Fixed maturities, including securities pledged, Fair Value	29,883	27,454
Total fixed maturities, less securities pledged, Fair Value	28,486	25,938
Fixed maturities | OneAmerica
Schedule of Available for Sale, including Securities Pledged [Line Items]
Total fixed maturities, less securities pledged, Fair Value	1,400
Fixed maturities | Collateral Pledged
Schedule of Available for Sale, including Securities Pledged [Line Items]
Securities pledged, Amortized Cost	1,506	1,665
Securities pledged, Gross Unrealized Capital Gains	0	0
Securities pledged, Gross Unrealized Capital Losses	109	149
Embedded Derivatives	0	0
Fixed maturities, allowance for credit losses	0	0
Debt Securities, Available-for-Sale, Restricted	$ 1,397	$ 1,516

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