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Schedule I Summary of Investments - Other Than Investments in Affiliates (Details)
$ in Millions
Dec. 31, 2022
USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost $ 55,967
Amount at which shown on Balance Sheet 52,560
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 5,573
Fair Value 5,025
Amount at which shown on Balance Sheet 5,025
States, municipalities and political subdivisions  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 6,718
Fair Value 6,296
Amount at which shown on Balance Sheet 6,296
Foreign government/government agencies  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 596
Fair Value 547
Amount at which shown on Balance Sheet 547
Public utilities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 1,871
Fair Value 1,662
Amount at which shown on Balance Sheet 1,662
All other corporate bonds  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 14,923
Fair Value 13,571
Amount at which shown on Balance Sheet 13,571
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 9,852
Fair Value 9,130
Amount at which shown on Balance Sheet 9,130
Total fixed maturities, available-for-sale  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 39,533
Fair Value 36,231
Amount at which shown on Balance Sheet 36,231
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 366
Fair Value 333
Amount at which shown on Balance Sheet 333
Industrial, miscellaneous and all other  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 1,289
Fair Value 1,315
Amount at which shown on Balance Sheet 1,315
Non-redeemable preferred stocks  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 542
Fair Value 486
Amount at which shown on Balance Sheet 486
Equity securities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 1,831
Fair Value 1,801
Amount at which shown on Balance Sheet 1,801
Mortgage loans [2]  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 6,036
Fair Value 5,362
Amount at which shown on Balance Sheet 6,000
Other investments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 165
Fair Value 159
Amount at which shown on Balance Sheet 159
Short-term investments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 3,859
Fair Value 3,859
Amount at which shown on Balance Sheet 3,859
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 4,177
Amount at which shown on Balance Sheet $ 4,177