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Insurance Company Subsidiary Operations - Effects of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Written |  |
Net premiums | $ 79 | $ 61
Earned |  |
Net premiums | 77 | 28
WNFIC |  |
Written |  |
Direct premiums | 1,005 | 887
Ceded premiums | 1,005 | 887
Earned |  |
Direct premiums | 946 | 807
Ceded premiums | 946 | 807
Quota Share Captive and Excess of Loss Layer Captive |  |
Written |  |
Assumed premiums | 153 | 113
Net premiums | 79 | 61
Earned |  |
Assumed premiums | 151 | 90
Net premiums | 77 | 28
Quota Share Captive |  |
Written |  |
Ceded premiums | 74 | 52
Net premiums | 75 |
Earned |  |
Ceded premiums | 74 | $ 62
Net premiums | $ 73 |

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