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Insurance - Reinsurance information table including assumed, ceded, and recoveries (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Insurance [Abstract]      
Direct premiums written $ 10,342 $ 9,933 $ 9,309
Reinsurance assumed 352 600 347
Reinsurance ceded (3,584) (3,394) (2,964)
Net written premiums 7,110 7,139 6,692
Direct premiums earned 10,213 9,763 9,133
Reinsurance assumed 347 611 321
Reinsurance ceded (3,514) (3,338) (2,923)
Net earned premiums 7,046 7,036 6,531
Reinsurance recoveries $ 2,527 $ 3,040 $ 2,336