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Reinsurance - Excess-of-Loss Program (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2021 | Apr. 30, 2021 | Feb. 29, 2020 | Apr. 30, 2019 | Nov. 30, 2018 | Sep. 30, 2023 | Dec. 31, 2022
Mortgage |  |  |  |  |  |  |
RIF |  |  |  |  |  | $ 69,300 | $ 66,100
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2021-2 Ltd. | Mortgage |  |  |  |  |  |  |
RIF | $ 10,758 |  |  |  |  | 8,010 | 9,150
Initial and remaining coverage | 484 |  |  |  |  | 383 | 472
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2021-2 Ltd. | First layer retention | Mortgage |  |  |  |  |  |  |
First layer retention | $ 242 |  |  |  |  | 242 | 242
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2021-1 Ltd. | Mortgage |  |  |  |  |  |  |
RIF |  | $ 11,061 |  |  |  | 6,548 | 7,758
Initial and remaining coverage |  | 498 |  |  |  | 275 | 366
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2021-1 Ltd. | Radian Group Inc. |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | 45 |
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2021-1 Ltd. | First layer retention | Mortgage |  |  |  |  |  |  |
First layer retention |  | $ 221 |  |  |  | 221 | 221
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2020-1 Ltd. | Mortgage |  |  |  |  |  |  |
RIF |  |  | $ 9,866 |  |  | 2,113 | 2,401
Initial and remaining coverage |  |  | 488 |  |  | 17 | 368
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2020-1 Ltd. | First layer retention | Mortgage |  |  |  |  |  |  |
First layer retention |  |  | $ 202 |  |  | 202 | 202
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2019-1 Ltd. | Mortgage |  |  |  |  |  |  |
RIF |  |  |  | $ 10,705 |  | 0 | 1,769
Initial and remaining coverage |  |  |  | 562 |  | 0 | 385
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2019-1 Ltd. | First layer retention | Mortgage |  |  |  |  |  |  |
First layer retention |  |  |  | $ 268 |  | 0 | 263
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2018-1 Ltd. | Mortgage |  |  |  |  |  |  |
RIF |  |  |  |  | $ 9,109 | 1,261 | 1,509
Initial and remaining coverage |  |  |  |  | 434 | 276 | 276
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2018-1 Ltd. | Radian Group Inc. |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | 3 |
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2018-1 Ltd. | First layer retention | Mortgage |  |  |  |  |  |  |
First layer retention |  |  |  |  | $ 205 | $ 200 | $ 200

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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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- Definition Amount per life of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479838/944-20-50-3 + Details
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- Definition Amount per life of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479838/944-20-50-3 + Details
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