Consolidated Summary of Investments - Other Than Investments in Related Parties (Details) $ in Millions	Dec. 31, 2025 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	$ 123,515
Amount at Which Shown on Balance Sheet	118,558
U.S. government and agency
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	6,942
Estimated Fair Value	6,445
Amount at Which Shown on Balance Sheet	6,445
State and political subdivision
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	3,620
Estimated Fair Value	3,423
Amount at Which Shown on Balance Sheet	3,423
Public utilities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	3,888
Estimated Fair Value	3,560
Amount at Which Shown on Balance Sheet	3,560
Foreign government
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	974
Estimated Fair Value	942
Amount at Which Shown on Balance Sheet	942
All other corporate bonds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	49,319
Estimated Fair Value	46,147
Amount at Which Shown on Balance Sheet	46,147
Total bonds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	64,743
Estimated Fair Value	60,517
Amount at Which Shown on Balance Sheet	60,517
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	21,030
Estimated Fair Value	20,307
Amount at Which Shown on Balance Sheet	20,307
Redeemable preferred stock
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	134
Estimated Fair Value	136
Amount at Which Shown on Balance Sheet	136
Total fixed maturity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	85,907
Estimated Fair Value	80,960
Amount at Which Shown on Balance Sheet	80,960
Trading securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	512
Estimated Fair Value	506
Amount at Which Shown on Balance Sheet	506
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	10
Amount at Which Shown on Balance Sheet	10
Industrial, miscellaneous and all other
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	9
Estimated Fair Value	11
Amount at Which Shown on Balance Sheet	11
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	2
Amount at Which Shown on Balance Sheet	2
Total equity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	27
Estimated Fair Value	23
Amount at Which Shown on Balance Sheet	23
Mortgage loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	22,726
Amount at Which Shown on Balance Sheet	22,726
Policy loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	1,047
Amount at Which Shown on Balance Sheet	1,047
Limited partnerships and LLCs
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	4,696
Amount at Which Shown on Balance Sheet	4,696
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	668
Amount at Which Shown on Balance Sheet	668
Other invested assets
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	7,932
Amount at Which Shown on Balance Sheet	$ 7,932