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Insurance - Reinsurance information table including assumed, ceded, and recoveries (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Insurance [Abstract] |  |  |
Direct premiums written | $ 9,933 | $ 9,309 | $ 8,774
Reinsurance assumed | 600 | 347 | 283
Reinsurance ceded | (3,394) | (2,964) | (2,851)
Net written premiums | 7,139 | 6,692 | 6,206
Direct premiums earned | 9,763 | 9,133 | 8,582
Reinsurance assumed | 611 | 321 | 274
Reinsurance ceded | (3,338) | (2,923) | (2,771)
Net earned premiums | 7,036 | 6,531 | 6,085
Reinsurance recoveries | $ 3,040 | $ 2,336 | $ 2,065

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