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Fair Value Measurements (Fair Value Hierarchy For Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | $ 13,791 | $ 12,132
Separate accounts taxable fixed maturities | 925 | 892
Total | 25,701 | 22,845
Corporate Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 7,452 | 6,869
States, Municipalities and Political Subdivisions |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 4,703 | 4,622
Government-Sponsored Enterprises |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 1,224 | 183
United States Government |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 200 | 191
Mortgage-backed |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 187 | 234
Foreign Government |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 25 | 33
Top Hat Savings Plan - Mutual Funds and Common Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Top Hat savings plan mutual funds and common equity (included in Other assets) | 67 | 57
Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 200 | 191
Total | 10,908 | 9,702
Level 1 | Corporate Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 1 | States, Municipalities and Political Subdivisions |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 1 | Government-Sponsored Enterprises |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 1 | United States Government |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 200 | 191
Level 1 | Mortgage-backed |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 1 | Foreign Government |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 1 | Top Hat Savings Plan - Mutual Funds and Common Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Top Hat savings plan mutual funds and common equity (included in Other assets) | 67 | 57
Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 13,591 | 11,941
Total | 14,793 | 13,143
Level 2 | Corporate Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 7,452 | 6,869
Level 2 | States, Municipalities and Political Subdivisions |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 4,703 | 4,622
Level 2 | Government-Sponsored Enterprises |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 1,224 | 183
Level 2 | United States Government |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 2 | Mortgage-backed |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 187 | 234
Level 2 | Foreign Government |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 25 | 33
Level 2 | Top Hat Savings Plan - Mutual Funds and Common Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Top Hat savings plan mutual funds and common equity (included in Other assets) | 0 | 0
Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Total | 0 | 0
Level 3 | Corporate Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 3 | States, Municipalities and Political Subdivisions |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 3 | Government-Sponsored Enterprises |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 3 | United States Government |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 3 | Mortgage-backed |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 3 | Foreign Government |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of fixed maturities | 0 | 0
Level 3 | Top Hat Savings Plan - Mutual Funds and Common Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Top Hat savings plan mutual funds and common equity (included in Other assets) | 0 | 0
Equity Securities | Common Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Total | 10,641 | 9,454
Equity Securities | Nonredeemable Preferred Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Total | 348 | 387
Equity Securities | Level 1 | Common Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Total | 10,641 | 9,454
Equity Securities | Level 1 | Nonredeemable Preferred Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Total | 0 | 0
Equity Securities | Level 2 | Common Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Total | 0 | 0
Equity Securities | Level 2 | Nonredeemable Preferred Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Total | 348 | 387
Equity Securities | Level 3 | Common Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Total | 0 | 0
Equity Securities | Level 3 | Nonredeemable Preferred Equities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Total | 0 | 0
Taxable Fixed Maturities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Separate accounts taxable fixed maturities | 854 | 815
Taxable Fixed Maturities | Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Separate accounts taxable fixed maturities | 0 | 0
Taxable Fixed Maturities | Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Separate accounts taxable fixed maturities | 854 | 815
Taxable Fixed Maturities | Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Separate accounts taxable fixed maturities | $ 0 | $ 0

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