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Property Casualty Loss and Loss Expense - Claims Development - Excess and Surplus Lines (Details) reported_claim in Thousands, $ in Millions | Dec. 31, 2023 USD ($) reported_claim | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
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Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | $ 3,496 |  |  |  |  |  |  |  |  |
Liabilities for loss and ALAE, net of reinsurance | 8,535 |  |  |  |  |  |  |  |  |
Excess and Surplus Lines Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 1,545 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | 707 |  |  |  |  |  |  |  |  |
All outstanding liabilities before, net of reinsurance | 4 |  |  |  |  |  |  |  |  |
Liabilities for loss and ALAE, net of reinsurance | 842 |  |  |  |  |  |  |  |  |
2014 | Excess and Surplus Lines Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 57 | $ 56 | $ 58 | $ 59 | $ 59 | $ 60 | $ 64 | $ 75 | $ 82 | $ 95
Total of incurred but not reported liabilities plus expected development on reported losses | $ 0 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 2 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 55 | 55 | 53 | 51 | 48 | 43 | 37 | 27 | 17 | $ 9
2015 | Excess and Surplus Lines Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 65 | 61 | 65 | 66 | 65 | 67 | 73 | 81 | 96 |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 0 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 2 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 62 | 58 | 56 | 54 | 51 | 41 | 29 | 19 | $ 8 |
2016 | Excess and Surplus Lines Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 89 | 88 | 91 | 90 | 82 | 84 | 87 | 93 |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 2 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 3 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 83 | 81 | 75 | 62 | 51 | 39 | 21 | $ 10 |  |
2017 | Excess and Surplus Lines Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 94 | 91 | 94 | 94 | 95 | 95 | 104 |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 4 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 3 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 88 | 77 | 68 | 57 | 41 | 23 | $ 11 |  |  |
2018 | Excess and Surplus Lines Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 105 | 107 | 108 | 110 | 109 | 116 |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 6 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 3 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 88 | 75 | 62 | 50 | 26 | $ 11 |  |  |  |
2019 | Excess and Surplus Lines Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 142 | 139 | 141 | 135 | 137 |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 16 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 3 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 102 | 79 | 55 | 34 | $ 13 |  |  |  |  |
2020 | Excess and Surplus Lines Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 152 | 160 | 172 | 172 |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 26 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 4 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 86 | 56 | 37 | $ 16 |  |  |  |  |  |
2021 | Excess and Surplus Lines Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 233 | 235 | 217 |  |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 66 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 4 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 82 | 45 | $ 17 |  |  |  |  |  |  |
2022 | Excess and Surplus Lines Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 280 | 294 |  |  |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 134 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 3 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 46 | $ 21 |  |  |  |  |  |  |  |
2023 | Excess and Surplus Lines Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 328 |  |  |  |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 251 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 2 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 15 |  |  |  |  |  |  |  |  |

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