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Transactions With Related Parties (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net premiums written | $ 3,428 | $ 2,685 | $ 6,852 | $ 5,319 |  |  |  |
Net premiums earned | 2,965 | 2,326 | 5,848 | 4,447 |  |  |  |
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses | 6,717 | $ 5,939 | 6,717 | 5,939 | $ 6,612 | $ 6,564 | $ 5,941 | $ 5,881
Reinsurance balances payable | 2,191 |  | 2,191 |  |  | 1,530 |  |
Operating affiliates | Somers Holdings Ltd |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net premiums written |  |  | 314 | $ 347 |  |  |  |
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses | 1,300 |  | 1,300 |  |  | 1,200 |  |
Reinsurance balances payable | 485 |  | 485 |  |  | 414 |  |
Equity Method Investee | Premia Holdings Ltd |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net premiums written |  |  | 75 |  |  |  |  |
Net premiums earned |  |  | 75 |  |  |  |  |
Funds held asset | $ 191 |  | $ 191 |  |  | $ 119 |  |

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -SubTopic 220 -Topic 942 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -SubTopic 220 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 + Details
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