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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | $ 0 | $ 8,439
Fixed maturities, held-to-maturity |  | 8,882
Private debt held-for-investment | 2,553 | 0
Total assets (preliminary) | 230,682 | 199,017
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 2,833 | 1,419
Short-term debt | 1,460 | 475
Long-term debt | 13,035 | 14,402
Total liabilities | 166,991 | 148,498
Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity |  | 8,848
Private debt held-for-investment | 2,553 |
Total assets (preliminary) | 2,553 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 2,833 | 1,419
Short-term debt | 1,460 | 475
Long-term debt | 13,035 | 14,402
Trust preferred securities | 308 | 308
Total liabilities | 17,636 | 16,604
Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,299
Private debt held-for-investment | 0 |
Total assets (preliminary) | 0 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 0 | 0
Short-term debt, Fair Value | 0 | 0
Long-term debt, Fair Value | 0 | 0
Trust preferred securities | 0 | 0
Total liabilities | 0 | 0
Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 7,140
Private debt held-for-investment | 0 |
Total assets (preliminary) | 0 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 2,833 | 1,419
Short-term debt, Fair Value | 1,431 | 473
Long-term debt, Fair Value | 11,924 | 12,495
Trust preferred securities | 365 | 383
Total liabilities | 16,553 | 14,770
Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Private debt held-for-investment | 2,560 |
Total assets (preliminary) | 2,560 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 0 | 0
Short-term debt, Fair Value | 0 | 0
Long-term debt, Fair Value | 0 | 0
Trust preferred securities | 0 | 0
Total liabilities | 0 | 0
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 8,439
Private debt held-for-investment | 2,560 |
Total assets (preliminary) | 2,560 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 2,833 | 1,419
Short-term debt, Fair Value | 1,431 | 473
Long-term debt, Fair Value | 11,924 | 12,495
Trust preferred securities | 365 | 383
Total liabilities | $ 16,553 | 14,770
U.S. Treasury / Agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,370
Fixed maturities, held-to-maturity |  | 1,417
U.S. Treasury / Agency | Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity |  | 1,417
U.S. Treasury / Agency | Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,299
U.S. Treasury / Agency | Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 71
U.S. Treasury / Agency | Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
U.S. Treasury / Agency | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,370
Non-U.S. |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,054
Fixed maturities, held-to-maturity |  | 1,140
Non-U.S. | Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity |  | 1,136
Non-U.S. | Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Non-U.S. | Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,054
Non-U.S. | Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Non-U.S. | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,054
Corporate and asset-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,580
Fixed maturities, held-to-maturity |  | 1,733
Corporate and asset-backed securities | Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity |  | 1,705
Corporate and asset-backed securities | Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Corporate and asset-backed securities | Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,580
Corporate and asset-backed securities | Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Corporate and asset-backed securities | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,580
Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,351
Fixed maturities, held-to-maturity |  | 1,456
Mortgage-backed securities | Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity |  | 1,455
Mortgage-backed securities | Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Mortgage-backed securities | Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,351
Mortgage-backed securities | Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Mortgage-backed securities | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 1,351
Municipal |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 3,084
Fixed maturities, held-to-maturity |  | 3,136
Municipal | Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity |  | 3,135
Municipal | Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Municipal | Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 3,084
Municipal | Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | 0
Municipal | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value |  | $ 3,084

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