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Property Casualty Loss and Loss Expense - Claims Development - Personal Auto (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 ($)
--- | --- | --- | --- | --- | ---
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 |  |  |  |
Personal Auto | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 1,884 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | 1,594 |  |  |  |
All outstanding liabilities before, net of reinsurance | 12 |  |  |  |
Liabilities for loss and ALAE, net of reinsurance | 302 |  |  |  |
2019 | Personal Auto | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 381 | $ 383 | $ 380 | $ 383 | $ 399
Total of incurred but not reported liabilities plus expected development on reported losses | $ 2 |  |  |  |
Cumulative number of reported claims | reported_claim | 102 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 373 | 363 | 346 | 314 | $ 250
2020 | Personal Auto | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 277 | 277 | 281 | 305 |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 3 |  |  |  |
Cumulative number of reported claims | reported_claim | 71 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 264 | 248 | 225 | $ 186 |
2021 | Personal Auto | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 342 | 343 | 350 |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 6 |  |  |  |
Cumulative number of reported claims | reported_claim | 80 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 304 | 278 | $ 219 |  |
2022 | Personal Auto | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 418 | 427 |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 15 |  |  |  |
Cumulative number of reported claims | reported_claim | 86 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 349 | $ 277 |  |  |
2023 | Personal Auto | Personal Insurance |  |  |  |  |
Claims Development |  |  |  |  |
Incurred losses and ALAE, net of reinsurance for the years ended December 31, | 466 |  |  |  |
Total of incurred but not reported liabilities plus expected development on reported losses | $ 72 |  |  |  |
Cumulative number of reported claims | reported_claim | 86 |  |  |  |
Cumulative paid losses and ALAE, net of reinsurance | $ 304 |  |  |  |

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- Definition Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (b) -SubTopic 40 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-4B + Details
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