Schedule I. Summary of Investments (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	$ (27,361)
Fair Value	25,383
Amount Shown on Consolidated Balance Sheets	25,556
U.S. Treasuries
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(428)
Fair Value	378
Amount Shown on Consolidated Balance Sheets	378
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	27
Amount Shown on Consolidated Balance Sheets	27
State, municipalities and political subdivisions
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(491)
Fair Value	409
Amount Shown on Consolidated Balance Sheets	409
U.S. corporate public securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(6,095)
Fair Value	5,249
Amount Shown on Consolidated Balance Sheets	5,249
U.S. corporate private securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(4,035)
Fair Value	3,799
Amount Shown on Consolidated Balance Sheets	3,799
Foreign corporate public securities and foreign governments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(2,087)
Fair Value	1,868
Amount Shown on Consolidated Balance Sheets	1,868
Foreign corporate private securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(2,160)
Fair Value	2,029
Amount Shown on Consolidated Balance Sheets	2,029
Residential mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(2,638)
Fair Value	2,525
Amount Shown on Consolidated Balance Sheets	2,525
Commercial mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(2,459)
Fair Value	2,111
Amount Shown on Consolidated Balance Sheets	2,111
Other asset-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(1,741)
Fair Value	1,739
Amount Shown on Consolidated Balance Sheets	1,739
Embedded derivatives - fixed maturities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(22,163)
Fair Value	20,134
Amount Shown on Consolidated Balance Sheets	20,134
Equity Securities [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(66)
Fair Value	66
Amount Shown on Consolidated Balance Sheets	66
Mortgage loans on real estate
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(3,632)
Fair Value	3,440
Amount Shown on Consolidated Balance Sheets	3,613
Policy loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(163)
Fair Value	163
Amount Shown on Consolidated Balance Sheets	163
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(20)
Fair Value	20
Amount Shown on Consolidated Balance Sheets	20
Limited partnerships/corporations
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(1,227)
Fair Value	1,227
Amount Shown on Consolidated Balance Sheets	1,227
Derivatives
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(4)
Fair Value	239
Amount Shown on Consolidated Balance Sheets	239
Other 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 Sheets	$ 94