Consolidated Summary of Investments - Other Than Investments in Related Parties (Details) $ in Millions	Dec. 31, 2024 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	$ 122,714
Amount at Which Shown on Balance Sheet	115,269
U.S. government and agency
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	7,112
Estimated Fair Value	6,460
Amount at Which Shown on Balance Sheet	6,460
State and political subdivision
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	3,671
Estimated Fair Value	3,382
Amount at Which Shown on Balance Sheet	3,382
Public utilities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	4,035
Estimated Fair Value	3,625
Amount at Which Shown on Balance Sheet	3,625
Foreign government
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	1,036
Estimated Fair Value	960
Amount at Which Shown on Balance Sheet	960
All other corporate bonds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	49,229
Estimated Fair Value	44,513
Amount at Which Shown on Balance Sheet	44,513
Total bonds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	65,083
Estimated Fair Value	58,940
Amount at Which Shown on Balance Sheet	58,940
Mortgage-backed and asset-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	21,106
Estimated Fair Value	19,828
Amount at Which Shown on Balance Sheet	19,828
Redeemable preferred stock
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	376
Estimated Fair Value	361
Amount at Which Shown on Balance Sheet	361
Total fixed maturity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	86,565
Estimated Fair Value	79,129
Amount at Which Shown on Balance Sheet	79,129
Non-redeemable preferred stock
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	18
Estimated Fair Value	11
Amount at Which Shown on Balance Sheet	11
Industrial, miscellaneous and all other
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	23
Estimated Fair Value	20
Amount at Which Shown on Balance Sheet	20
Public utilities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	0
Estimated Fair Value	1
Amount at Which Shown on Balance Sheet	1
Total equity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	41
Estimated Fair Value	32
Amount at Which Shown on Balance Sheet	32
Mortgage loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	23,254
Amount at Which Shown on Balance Sheet	23,254
Policy loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	1,626
Amount at Which Shown on Balance Sheet	1,626
Limited partnerships and LLCs
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	4,827
Amount at Which Shown on Balance Sheet	4,827
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	1,157
Amount at Which Shown on Balance Sheet	1,157
Other invested assets
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	5,244
Amount at Which Shown on Balance Sheet	$ 5,244