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Schedule I Summary of Investments - Other Than Investments in Affiliates (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	$ 61,218
Amount at which shown on Balance Sheet	59,210
Commercial Loan [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Financing Receivable, Allowance for Credit Loss	44	$ 51	$ 36	$ 29
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	5,424
Fair Value	4,937
Amount at which shown on Balance Sheet	4,937
States, municipalities and political subdivisions
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	5,574
Fair Value	5,304
Amount at which shown on Balance Sheet	5,304
Foreign government/government agencies
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	500
Fair Value	480
Amount at which shown on Balance Sheet	480
Public utilities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	2,464
Fair Value	2,305
Amount at which shown on Balance Sheet	2,305
All other corporate bonds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	19,091
Fair Value	18,331
Amount at which shown on Balance Sheet	18,331
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	11,485
Fair Value	11,210
Amount at which shown on Balance Sheet	11,210
Total fixed maturities, available-for-sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	44,538
Fair Value	42,567
Amount at which shown on Balance Sheet	42,567
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	324
Fair Value	308
Amount at which shown on Balance Sheet	308
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	438
Amount at which shown on Balance Sheet	438
Non-redeemable preferred stocks
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	170
Fair Value	165
Amount at which shown on Balance Sheet	165
Equity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	554
Fair Value	603
Amount at which shown on Balance Sheet	603
Mortgage loans [2]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	6,440
Fair Value	5,901
Amount at which shown on Balance Sheet	6,396
Other investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	252
Fair Value	226
Amount at which shown on Balance Sheet	226
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	4,068
Fair Value	4,068
Amount at which shown on Balance Sheet	4,068
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	5,042
Amount at which shown on Balance Sheet	$ 5,042

X

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