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Property Casualty Loss and Loss Expense - Claims Development - Workers Compensation (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 |  |  |  |  |  |  |  |  |
Workers' Compensation Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 1,826 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | 1,160 |  |  |  |  |  |  |  |  |
All outstanding liabilities before, net of reinsurance | 316 |  |  |  |  |  |  |  |  |
Liabilities for loss and ALAE, net of reinsurance | 982 |  |  |  |  |  |  |  |  |
2014 | Workers' Compensation Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 203 | $ 202 | $ 202 | $ 197 | $ 198 | $ 201 | $ 203 | $ 214 | $ 233 | $ 261
Total of incurred but not reported liabilities plus expected development on reported losses | $ 15 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 19 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 172 | 171 | 168 | 165 | 162 | 157 | 148 | 134 | 110 | $ 56
2015 | Workers' Compensation Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 167 | 171 | 173 | 173 | 179 | 195 | 208 | 220 | 246 |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 20 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 17 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 140 | 139 | 139 | 137 | 134 | 129 | 115 | 93 | $ 47 |
2016 | Workers' Compensation Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 181 | 183 | 183 | 183 | 188 | 206 | 218 | 230 |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 22 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 16 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 150 | 148 | 146 | 141 | 131 | 119 | 97 | $ 46 |  |
2017 | Workers' Compensation Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 160 | 167 | 172 | 183 | 190 | 208 | 218 |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 21 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 15 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 126 | 122 | 119 | 114 | 106 | 88 | $ 45 |  |  |
2018 | Workers' Compensation Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 175 | 179 | 186 | 199 | 207 | 222 |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 26 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 15 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 135 | 133 | 127 | 115 | 95 | $ 48 |  |  |  |
2019 | Workers' Compensation Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 178 | 188 | 202 | 215 | 224 |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 31 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 14 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 129 | 122 | 115 | 94 | $ 49 |  |  |  |  |
2020 | Workers' Compensation Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 153 | 172 | 190 | 204 |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 39 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 11 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 96 | 82 | 68 | $ 37 |  |  |  |  |  |
2021 | Workers' Compensation Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 183 | 190 | 202 |  |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 42 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 11 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 100 | 82 | $ 37 |  |  |  |  |  |  |
2022 | Workers' Compensation Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 205 | 209 |  |  |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 65 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 11 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 76 | $ 37 |  |  |  |  |  |  |  |
2023 | Workers' Compensation Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 221 |  |  |  |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 106 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 9 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 36 |  |  |  |  |  |  |  |  |

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