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Property Casualty Loss and Loss Expense - Claims Development - Homeowner (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 ($)
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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 |  |  |  |
Homeowner | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 2,576 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | 2,231 |  |  |  |
All outstanding liabilities before, net of reinsurance | 6 |  |  |  |
Liabilities for loss and ALAE, net of reinsurance | 351 |  |  |  |
2019 | Homeowner | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 418 | $ 418 | $ 422 | $ 421 | $ 432
Total of incurred but not reported liabilities plus expected development on reported losses | $ 2 |  |  |  |
Cumulative number of reported claims | reported_claim | 22 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 414 | 411 | 407 | 391 | $ 303
2020 | Homeowner | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 471 | 470 | 475 | 497 |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 3 |  |  |  |
Cumulative number of reported claims | reported_claim | 23 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 464 | 453 | 434 | $ 326 |
2021 | Homeowner | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 440 | 449 | 495 |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 4 |  |  |  |
Cumulative number of reported claims | reported_claim | 19 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 424 | 405 | $ 285 |  |
2022 | Homeowner | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 505 | 552 |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 21 |  |  |  |
Cumulative number of reported claims | reported_claim | 20 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 461 | $ 299 |  |  |
2023 | Homeowner | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 742 |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 116 |  |  |  |
Cumulative number of reported claims | reported_claim | 21 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 468 |  |  |  |

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