Fair Value - Schedule of Fair Value Measurements by Level (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Assets
Cash equivalents	$ 5,184	$ 3,199
Fixed maturity securities, available-for-sale:	27,005	26,236
Equity securities:	740	1,192
Other invested assets	10,839	9,749
Securities lending collateral	$ 2,692	$ 2,306
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Derivatives - other assets	$ 62	$ 5
Total assets	35,689	32,956
Liabilities
Derivatives - other liabilities	(28)	(150)
Total liabilities	(28)	(150)
United States Government securities
Assets
Fixed maturity securities, available-for-sale:	1,503	1,824
Government sponsored securities
Assets
Fixed maturity securities, available-for-sale:	81	151
Foreign government securities
Assets
Fixed maturity securities, available-for-sale:	13	17
States, municipalities and political subdivisions, tax-exempt
Assets
Fixed maturity securities, available-for-sale:	3,701	3,052
Corporate securities
Assets
Fixed maturity securities, available-for-sale:	13,783	13,916
Residential mortgage-backed securities
Assets
Fixed maturity securities, available-for-sale:	3,107	3,051
Commercial mortgage-backed securities
Assets
Fixed maturity securities, available-for-sale:	2,073	1,748
Other asset-backed securities
Assets
Fixed maturity securities, available-for-sale:	2,744	2,477
Exchange traded funds
Assets
Equity securities:	650	1,002
Common equity securities
Assets
Equity securities:	35	118
Other invested assets	6	18
Private equity securities
Assets
Equity securities:	55	72
Level I
Assets
Cash equivalents	5,184	3,199
Fixed maturity securities, available-for-sale:	0	0
Equity securities:	650	1,089
Securities lending collateral	0	0
Derivatives - other assets	0	0
Total assets	5,840	4,306
Liabilities
Derivatives - other liabilities	0	0
Total liabilities	0	0
Level I \| United States Government securities
Assets
Fixed maturity securities, available-for-sale:	0	0
Level I \| Government sponsored securities
Assets
Fixed maturity securities, available-for-sale:	0	0
Level I \| Foreign government securities
Assets
Fixed maturity securities, available-for-sale:	0	0
Level I \| States, municipalities and political subdivisions, tax-exempt
Assets
Fixed maturity securities, available-for-sale:	0	0
Level I \| Corporate securities
Assets
Fixed maturity securities, available-for-sale:	0	0
Level I \| Residential mortgage-backed securities
Assets
Fixed maturity securities, available-for-sale:	0	0
Level I \| Commercial mortgage-backed securities
Assets
Fixed maturity securities, available-for-sale:	0	0
Level I \| Other asset-backed securities
Assets
Fixed maturity securities, available-for-sale:	0	0
Level I \| Exchange traded funds
Assets
Equity securities:	650	1,002
Level I \| Common equity securities
Assets
Equity securities:	0	87
Other invested assets	6	18
Level I \| Private equity securities
Assets
Equity securities:	0	0
Level II
Assets
Cash equivalents	0	0
Fixed maturity securities, available-for-sale:	25,712	25,436
Equity securities:	35	31
Securities lending collateral	2,692	2,306
Derivatives - other assets	62	5
Total assets	28,501	27,778
Liabilities
Derivatives - other liabilities	(28)	(150)
Total liabilities	(28)	(150)
Level II \| United States Government securities
Assets
Fixed maturity securities, available-for-sale:	1,503	1,824
Level II \| Government sponsored securities
Assets
Fixed maturity securities, available-for-sale:	81	151
Level II \| Foreign government securities
Assets
Fixed maturity securities, available-for-sale:	13	17
Level II \| States, municipalities and political subdivisions, tax-exempt
Assets
Fixed maturity securities, available-for-sale:	3,701	3,052
Level II \| Corporate securities
Assets
Fixed maturity securities, available-for-sale:	13,373	13,873
Level II \| Residential mortgage-backed securities
Assets
Fixed maturity securities, available-for-sale:	3,090	3,041
Level II \| Commercial mortgage-backed securities
Assets
Fixed maturity securities, available-for-sale:	2,073	1,748
Level II \| Other asset-backed securities
Assets
Fixed maturity securities, available-for-sale:	1,878	1,730
Level II \| Exchange traded funds
Assets
Equity securities:	0	0
Level II \| Common equity securities
Assets
Equity securities:	35	31
Other invested assets	0	0
Level II \| Private equity securities
Assets
Equity securities:	0	0
Level III
Assets
Cash equivalents	0	0
Fixed maturity securities, available-for-sale:	1,293	800
Equity securities:	55	72
Securities lending collateral	0	0
Derivatives - other assets	0	0
Total assets	1,348	872
Liabilities
Derivatives - other liabilities	0	0
Total liabilities	0	0
Level III \| United States Government securities
Assets
Fixed maturity securities, available-for-sale:	0	0
Level III \| Government sponsored securities
Assets
Fixed maturity securities, available-for-sale:	0	0
Level III \| Foreign government securities
Assets
Fixed maturity securities, available-for-sale:	0	0
Level III \| States, municipalities and political subdivisions, tax-exempt
Assets
Fixed maturity securities, available-for-sale:	0	0
Level III \| Corporate securities
Assets
Fixed maturity securities, available-for-sale:	410	43
Level III \| Residential mortgage-backed securities
Assets
Fixed maturity securities, available-for-sale:	17	10
Level III \| Commercial mortgage-backed securities
Assets
Fixed maturity securities, available-for-sale:	0	0
Level III \| Other asset-backed securities
Assets
Fixed maturity securities, available-for-sale:	866	747
Level III \| Exchange traded funds
Assets
Equity securities:	0	0
Level III \| Common equity securities
Assets
Equity securities:	0	0
Other invested assets	0	0
Level III \| Private equity securities
Assets
Equity securities:	$ 55	$ 72

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