Schedule VI (Details) - Consolidated Property and Casualty Insurance Entity [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Supplementary Information Concerning Property-Casualty Insurance Operations
Deferred acquisition costs	$ 3,306	$ 2,836	$ 2,542
Claims and claim adjustment expense reserves	61,621	58,643	56,897
Discount from reserves for unpaid claims	1,096	1,124	1,146
Unearned premiums	20,872	18,240	16,469
Earned premiums	37,761	33,763	30,855
Net investment income	2,922	2,562	3,033
Claims and claim adjustment expenses incurred related to current year	26,159	23,308	20,698
Claims and claim adjustment expenses incurred related to prior year	(38)	(537)	(484)
Amortization of deferred acquisition costs	6,226	5,515	5,043
Paid claims and claim adjustment expenses	23,276	20,351	17,871
Net written premiums	$ 40,201	$ 35,414	$ 31,959