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Schedule I Summary of Investments - Other Than Investments in Affiliates (Details)
$ in Millions
Dec. 31, 2023
USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost $ 57,981
Amount at which shown on Balance Sheet 55,922
U.S. government and government agencies and authorities (guaranteed and sponsored)  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 5,174
Fair Value 4,776
Amount at which shown on Balance Sheet 4,776
States, municipalities and political subdivisions  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 6,207
Fair Value 6,039
Amount at which shown on Balance Sheet 6,039
Foreign government/government agencies  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 583
Fair Value 562
Amount at which shown on Balance Sheet 562
Public utilities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 2,155
Fair Value 2,029
Amount at which shown on Balance Sheet 2,029
All other corporate bonds  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 16,536
Fair Value 15,837
Amount at which shown on Balance Sheet 15,837
All other mortgage-backed and asset-backed securities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 11,071
Fair Value 10,575
Amount at which shown on Balance Sheet 10,575
Total fixed maturities, available-for-sale  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 41,726
Fair Value 39,818
Amount at which shown on Balance Sheet 39,818
Fixed Income Securities, Fair Value Option [Member]  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 350
Fair Value 327
Amount at which shown on Balance Sheet 327
Industrial, miscellaneous and all other  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 384
Fair Value 385
Amount at which shown on Balance Sheet 385
Non-redeemable preferred stocks  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 527
Fair Value 479
Amount at which shown on Balance Sheet 479
Equity securities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 911
Fair Value 864
Amount at which shown on Balance Sheet 864
Mortgage loans [2]  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 6,138
Fair Value 5,584
Amount at which shown on Balance Sheet 6,087
Other investments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 221
Fair Value 191
Amount at which shown on Balance Sheet 191
Short-term investments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 3,850
Fair Value 3,850
Amount at which shown on Balance Sheet 3,850
Limited partnerships and other alternative investments [3]  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 4,785
Amount at which shown on Balance Sheet $ 4,785