Schedule I - Summary of Investments Other than Investments in Affiliates (Details) $ in Millions	Dec. 31, 2024 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	$ (37,337)
Fair Value	34,808
Amount Shown on Consolidated Balance Sheet	35,024
Fixed maturities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(30,050)
Fair Value	27,454
Amount Shown on Consolidated Balance Sheet	27,454
U.S. Treasuries
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(524)
Fair Value	472
Amount Shown on Consolidated Balance Sheet	472
U.S. Government agencies and authorities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(29)
Fair Value	30
Amount Shown on Consolidated Balance Sheet	30
State, municipalities, and political subdivisions
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(697)
Fair Value	580
Amount Shown on Consolidated Balance Sheet	580
U.S. corporate public securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(7,938)
Fair Value	7,008
Amount Shown on Consolidated Balance Sheet	7,008
U.S. corporate private securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(5,275)
Fair Value	4,983
Amount Shown on Consolidated Balance Sheet	4,983
Foreign Corporate Public Securities and Foreign Governments [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(2,729)
Fair Value	2,472
Amount Shown on Consolidated Balance Sheet	2,472
Foreign corporate private securities(1)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(2,693)
Fair Value	2,537
Amount Shown on Consolidated Balance Sheet	2,537
Residential mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(3,709)
Fair Value	3,471
Amount Shown on Consolidated Balance Sheet	3,471
Commercial mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(3,677)
Fair Value	3,132
Amount Shown on Consolidated Balance Sheet	3,132
Other asset-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(2,779)
Fair Value	2,769
Amount Shown on Consolidated Balance Sheet	2,769
Equity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(246)
Fair Value	246
Amount Shown on Consolidated Balance Sheet	246
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(94)
Fair Value	94
Amount Shown on Consolidated Balance Sheet	94
Mortgage loans on real estate
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(4,699)
Fair Value	4,459
Amount Shown on Consolidated Balance Sheet	4,675
Policy loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(342)
Fair Value	342
Amount Shown on Consolidated Balance Sheet	342
Limited partnerships/corporations
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(1,836)
Fair Value	1,836
Amount Shown on Consolidated Balance Sheet	1,836
Derivatives
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(4)
Fair Value	303
Amount Shown on Consolidated Balance Sheet	303
Other investments, including securities pledged
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(74)
Fair Value	74
Amount Shown on Consolidated Balance Sheet	$ 74