Schedule VI (Details) - Consolidated Property and Casualty Insurance Entity [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplementary Information Concerning Property-Casualty Insurance Operations
Deferred acquisition costs	$ 2,542	$ 2,358	$ 2,273
Claims and claim adjustment expense reserves	56,897	54,510	51,836
Discount from reserves for unpaid claims	1,146	1,138	1,155
Unearned premiums	16,469	15,222	14,604
Earned premiums	30,855	29,044	28,272
Net investment income	3,033	2,227	2,468
Claims and claim adjustment expenses incurred related to current year	20,698	19,285	18,854
Claims and claim adjustment expenses incurred related to prior year	(484)	(267)	164
Amortization of deferred acquisition costs	5,043	4,773	4,601
Paid claims and claim adjustment expenses	17,871	16,589	17,794
Net written premiums	$ 31,959	$ 29,732	$ 29,151