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Insurance - Reinsurance information table including assumed, ceded, and recoveries (Details) - Property and casualty insurance - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Effects of Reinsurance [Line Items] |  |  |
Direct premiums written | $ 9,309 | $ 8,774 | $ 7,700
Reinsurance assumed | 347 | 283 | 246
Reinsurance ceded | (2,964) | (2,851) | (2,373)
Net written premiums | 6,692 | 6,206 | 5,573
Direct premiums earned | 9,133 | 8,582 | 7,462
Reinsurance assumed | 321 | 274 | 249
Reinsurance ceded | (2,923) | (2,771) | (2,307)
Net earned premiums | 6,531 | 6,085 | 5,404
Reinsurance recoveries | $ 2,336 | $ 2,065 | $ 1,478

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