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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Payable to brokers |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Liabilities | $ (90) | $ (70)
Corporate and other bonds |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 21,525 | 24,845
States, municipalities and political subdivisions |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 8,423 | 11,943
Asset-backed |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 7,291 | 7,585
Fixed maturities available-for-sale |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 37,239 | 44,373
Fixed maturities trading |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 265 | 7
Fixed maturity securities |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 37,504 | 44,380
Equity securities |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 1,340 | 1,674
Short term investments and other |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 4,010 | 4,770
Receivables |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 19 |
Level 1 | Payable to brokers |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Liabilities | (90) | (70)
Level 1 | Corporate and other bonds |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 118 | 140
Level 1 | States, municipalities and political subdivisions |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets |  |
Level 1 | Asset-backed |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets |  |
Level 1 | Fixed maturities available-for-sale |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 118 | 140
Level 1 | Fixed maturities trading |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 183 |
Level 1 | Fixed maturity securities |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 301 | 140
Level 1 | Equity securities |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 685 | 924
Level 1 | Short term investments and other |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 3,847 | 4,696
Level 1 | Receivables |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets |  |
Level 2 | Payable to brokers |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Liabilities |  |
Level 2 | Corporate and other bonds |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 20,605 | 23,768
Level 2 | States, municipalities and political subdivisions |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 8,381 | 11,887
Level 2 | Asset-backed |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 6,575 | 7,029
Level 2 | Fixed maturities available-for-sale |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 35,561 | 42,684
Level 2 | Fixed maturities trading |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 82 | 7
Level 2 | Fixed maturity securities |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 35,643 | 42,691
Level 2 | Equity securities |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 625 | 721
Level 2 | Short term investments and other |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 163 | 74
Level 2 | Receivables |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 19 |
Level 3 | Payable to brokers |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Liabilities |  |
Level 3 | Corporate and other bonds |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 802 | 937
Level 3 | States, municipalities and political subdivisions |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 42 | 56
Level 3 | Asset-backed |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 716 | 556
Level 3 | Fixed maturities available-for-sale |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 1,560 | 1,549
Level 3 | Fixed maturities trading |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets |  |
Level 3 | Fixed maturity securities |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 1,560 | 1,549
Level 3 | Equity securities |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 30 | 29
Level 3 | Short term investments and other |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets |  |
Level 3 | Receivables |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets |  |

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