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Subsequent Events (Details) - Subsequent Event - USD ($) $ / shares in Units, $ in Millions | Nov. 07, 2024 | Oct. 30, 2024 | Oct. 31, 2024 | Oct. 29, 2024
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Subsequent Event [Line Items] |  |  |  |
Special cash dividend declared | $ 1,900 |  |  |
Special cash dividend (in dollars per share) | $ 5.00 |  |  |
LLOYDS BANK CORPORATE MARKETS | Amended L/C agreement |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Maximum borrowing capacity |  | $ 700 |  | $ 530
Increase in maximum borrowing capacity |  | $ 170 |  |
Letters of credit outstanding, amount |  |  | $ 700 |
Loss from Catastrophes | Hurricane Milton | Minimum |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Estimate of loss, net of reinsurance and reinstatement premiums |  |  | 275 |
Estimate of loss, industry |  |  | 25,000 |
Loss from Catastrophes | Hurricane Milton | Maximum |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Estimate of loss, net of reinsurance and reinstatement premiums |  |  | 375 |
Estimate of loss, industry |  |  | $ 35,000 |

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