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Property Casualty Loss and Loss Expense - Claims Development - Commercial Casualty (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 |  |  |  |  |  |  |  |  |
Commercial Casualty Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 6,497 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | 3,680 |  |  |  |  |  |  |  |  |
All outstanding liabilities before, net of reinsurance | 91 |  |  |  |  |  |  |  |  |
Liabilities for loss and ALAE, net of reinsurance | 2,908 |  |  |  |  |  |  |  |  |
2014 | Commercial Casualty Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 464 | $ 462 | $ 466 | $ 469 | $ 465 | $ 479 | $ 476 | $ 479 | $ 496 | $ 503
Total of incurred but not reported liabilities plus expected development on reported losses | $ 10 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 21 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 447 | 437 | 421 | 409 | 390 | 338 | 287 | 172 | 97 | $ 34
2015 | Commercial Casualty Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 513 | 496 | 504 | 502 | 508 | 516 | 529 | 526 | 533 |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 14 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 22 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 471 | 453 | 424 | 404 | 362 | 287 | 200 | 108 | $ 38 |
2016 | Commercial Casualty Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 525 | 531 | 538 | 554 | 555 | 557 | 574 | 563 |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 19 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 22 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 485 | 466 | 434 | 395 | 331 | 228 | 126 | $ 46 |  |
2017 | Commercial Casualty Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 553 | 554 | 555 | 571 | 577 | 597 | 610 |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 29 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 21 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 486 | 437 | 392 | 320 | 234 | 122 | $ 48 |  |  |
2018 | Commercial Casualty Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 618 | 612 | 588 | 622 | 641 | 650 |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 55 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 22 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 505 | 441 | 345 | 253 | 148 | $ 44 |  |  |  |
2019 | Commercial Casualty Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 682 | 669 | 607 | 643 | 672 |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 80 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 21 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 503 | 394 | 259 | 134 | $ 39 |  |  |  |  |
2020 | Commercial Casualty Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 593 | 606 | 629 | 674 |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 112 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 15 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 345 | 242 | 102 | $ 33 |  |  |  |  |  |
2021 | Commercial Casualty Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 697 | 697 | 714 |  |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 265 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 14 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 251 | 123 | $ 31 |  |  |  |  |  |  |
2022 | Commercial Casualty Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 902 | 924 |  |  |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 453 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 13 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 141 | $ 37 |  |  |  |  |  |  |  |
2023 | Commercial Casualty Line | Commercial Insurance |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 950 |  |  |  |  |  |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 729 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | reported_claim | 8 |  |  |  |  |  |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 46 |  |  |  |  |  |  |  |  |

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