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Insurance Contracts - Premium Earned (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Insurance [Line Items] |  |  |
Premiums Earned, Net | $ 33 | $ 14 |
Direct Premiums Written | 81 | 61 |
Direct Premiums Earned | 75 | 46 |
Assumed Reinsurance Premiums Written | 17 | 0 |
Assumed Reinsurance Premiums Earned | 16 | 0 |
Ceded Premiums Written | 70 | 43 |
Ceded Reinsurance Premiums Earned | 57 | 32 |
Premiums Written, Net | 28 | $ 18 |
Premiums Receivable, Net | $ 299 |  | $ 290
Estimated Future Premium Payments Weighted Average Discounted Rate | 3.20% |  | 3.20%
Weighted average period of future premiums | 7 years 8 months 12 days | 8 years |
Reportable Geographical Components [Member] | United States [Member] |  |  |
Insurance [Line Items] |  |  |
Premiums Earned, Net | $ 30 | $ 11 |
Reportable Geographical Components [Member] | United Kingdom [Member] |  |  |
Insurance [Line Items] |  |  |
Premiums Earned, Net | 3 | 2 |
Reportable Geographical Components [Member] | Other International [Member] |  |  |
Insurance [Line Items] |  |  |
Premiums Earned, Net | $ 0 | $ 0 |

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- Definition Amount of earned premiums assumed from other entities. + 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 D)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 + Details
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