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Regulation and Equity - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2024
Statutory Accounting Practices [Line Items] |  |  |  |
Change in statutory capital surplus | $ 34 | $ 32 |  |
Combined statutory unearned premium reserve required | 1,659 |  |  |
Net assets restricted from dividend payments without prior approval | 1,145 |  |  |
Statutory capital and surplus | 1,225 | 1,350 |  |
Statutory net income | 503 | 778 | $ 936 |
Minimum net worth required for compliance | 1 |  |  |
Dividends paid with approval of Iowa Commissioner |  |  | $ 38 |
Corbeau Re |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Change in statutory capital surplus | 765 |  |  |
Non-permitted statutory accounting practices deficit | (594) |  |  |
Statutory capital and surplus | 171 |  |  |
IOWA |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Change in statutory capital surplus | 16 | 13 |  |
Increase (decrease) in statutory capital surplus | 178 | (152) |  |
Statutory capital and surplus | 2,009 | 1,877 |  |
VERMONT | Corbeau Re |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Statutory capital and surplus |  | 0 |  |
VERMONT | Raven Re |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Statutory capital and surplus | 140 | 121 |  |
VERMONT | Raven Re |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Change in statutory capital surplus |  | 200 |  |
Statutory capital and surplus | 140 | 121 |  |
Non-permitted statutory accounting practices deficit | (89) | (107) |  |
New York |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Statutory capital and surplus | $ 86 | $ 82 |  |
Forecast |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Statutory amount available for distributions without prior approval |  |  |  | $ 471

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- Definition Amount of minimum net worth required for mortgage banking as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481586/948-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481586/948-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481586/948-10-50-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481586/948-10-50-5 + Details
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