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Reinsurance - Effects of reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Premiums Written
Direct	$ 10,250	$ 10,056	$ 9,652
Assumed	12,628	11,455	8,751
Ceded	(6,402)	(5,779)	(4,935)
Net premiums written	16,476	15,732	13,468
Premiums Earned
Direct	10,200	9,721	9,131
Assumed	13,089	10,880	7,890
Ceded	(6,224)	(5,501)	(4,581)
Net premiums earned	17,065	15,100	12,440
Losses and Loss Adjustment Expenses
Direct	5,975	5,676	4,739
Assumed	7,260	6,137	3,975
Ceded	(3,865)	(3,471)	(2,468)
Net	$ 9,370	$ 8,342	$ 6,246

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