Schedule VI (Details) - Consolidated Property and Casualty Insurance Entity [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Supplementary Information Concerning Property-Casualty Insurance Operations
Deferred acquisition costs	$ 3,494	$ 3,306	$ 2,836
Claims and claim adjustment expense reserves	64,088	61,621	58,643
Discount from reserves for unpaid claims	1,070	1,096	1,124
Unearned premiums	22,289	20,872	18,240
Earned premiums	41,941	37,761	33,763
Net investment income	3,590	2,922	2,562
Claims and claim adjustment expenses incurred related to current year	27,508	26,159	23,308
Claims and claim adjustment expenses incurred related to prior year	(548)	(38)	(537)
Amortization of deferred acquisition costs	6,973	6,226	5,515
Paid claims and claim adjustment expenses	24,151	23,276	20,351
Net written premiums	$ 43,356	$ 40,201	$ 35,414