Consolidated Summary of Investments - Other Than Investments in Related Parties (Details) $ in Millions	Dec. 31, 2022 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	$ 115,296
Amount at Which Shown on Balance Sheet	106,655
U.S. government and agency
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	8,195
Estimated Fair Value	7,898
Amount at Which Shown on Balance Sheet	7,898
State and political subdivision
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	4,015
Estimated Fair Value	3,741
Amount at Which Shown on Balance Sheet	3,741
Public utilities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	3,599
Estimated Fair Value	3,160
Amount at Which Shown on Balance Sheet	3,160
Foreign government
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	1,148
Estimated Fair Value	1,081
Amount at Which Shown on Balance Sheet	1,081
All other corporate bonds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	44,724
Estimated Fair Value	39,096
Amount at Which Shown on Balance Sheet	39,096
Total bonds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	61,681
Estimated Fair Value	54,976
Amount at Which Shown on Balance Sheet	54,976
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	21,270
Estimated Fair Value	19,383
Amount at Which Shown on Balance Sheet	19,383
Redeemable preferred stock
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	444
Estimated Fair Value	398
Amount at Which Shown on Balance Sheet	398
Total fixed maturity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	83,395
Estimated Fair Value	74,757
Amount at Which Shown on Balance Sheet	74,757
Non-redeemable preferred stock
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	43
Estimated Fair Value	37
Amount at Which Shown on Balance Sheet	37
Industrial, miscellaneous and all other
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	26
Estimated Fair Value	27
Amount at Which Shown on Balance Sheet	27
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	69
Estimated Fair Value	66
Amount at Which Shown on Balance Sheet	66
Mortgage loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	22,877
Amount at Which Shown on Balance Sheet	22,877
Policy loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	898
Amount at Which Shown on Balance Sheet	898
Limited partnerships and LLCs
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	4,774
Amount at Which Shown on Balance Sheet	4,774
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	299
Amount at Which Shown on Balance Sheet	299
Other invested assets
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	2,984
Amount at Which Shown on Balance Sheet	$ 2,984