Consolidated Statements Of Operations and Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Net premiums written	$ 41,755	$ 37,868	$ 33,820
Increase in unearned premiums	(1,366)	(1,513)	(703)
Net premiums earned	40,389	36,355	33,117
Net investment income	3,742	3,456	3,375
Net realized gains (losses)	(965)	1,152	(498)
Total revenues	43,166	40,963	35,994
Expenses
Losses and loss expenses	23,342	21,980	21,710
Policy benefits	1,492	699	784
Policy acquisition costs	7,392	6,918	6,547
Administrative expenses	3,395	3,136	2,979
Interest expense	570	492	516
Other (income) expense	74	(2,365)	(994)
Amortization of purchased intangibles	285	287	290
Cigna integration expenses	48	0	0
Total expenses	36,598	31,147	31,832
Income before income tax	6,568	9,816	4,162
Income tax expense	1,255	1,277	629
Net income	5,313	8,539	3,533
Other comprehensive income (loss):
Change in unrealized appreciation (depreciation)	(10,578)	(2,938)	2,592
Change in cumulative foreign currency translation adjustment	(986)	(530)	306
Change in other, including postretirement benefit liability adjustment	(100)	522	(232)
Other comprehensive income (loss), before income tax	(11,664)	(2,946)	2,666
Income tax (expense) benefit related to OCI items	1,121	427	(416)
Other comprehensive income (loss)	(10,543)	(2,519)	2,250
Comprehensive income (loss)	$ (5,230)	$ 6,020	$ 5,783
Earnings per share
Basic earnings per share	$ 12.66	$ 19.41	$ 7.82
Diluted earnings per share	$ 12.55	$ 19.27	$ 7.79