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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
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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 |  |  |

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