Consolidated Statements Of Operations and Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues
Net premiums written	$ 10,302	$ 9,546	$ 19,501	$ 18,208
Increase in unearned premiums	(745)	(733)	(1,198)	(1,174)
Net premiums earned	9,557	8,813	18,303	17,034
Net investment income	888	884	1,710	1,747
Net realized gains (losses) (includes $(442), $12, $(578), and $36 reclassified from AOCI)	(504)	(33)	(403)	854
Total revenues	9,941	9,664	19,610	19,635
Expenses
Losses and loss expenses	5,408	5,006	10,195	10,059
Policy benefits	159	185	304	352
Policy acquisition costs	1,739	1,698	3,476	3,363
Administrative expenses	818	775	1,596	1,519
Interest expense	134	122	266	244
Other (income) expense	101	(777)	(209)	(1,267)
Amortization of purchased intangibles	71	73	142	145
Cigna integration expenses	3	0	3	0
Total expenses	8,433	7,082	15,773	14,415
Income before income tax	1,508	2,582	3,837	5,220
Income tax expense (includes $(77), $(6), $(99), and $(2) on unrealized gains and losses reclassified from AOCI)	293	317	648	655
Net income	1,215	2,265	3,189	4,565
Other comprehensive income (loss)
Unrealized appreciation (depreciation)	(4,786)	706	(9,574)	(1,587)
Reclassification adjustment for net realized (gains) losses included in net income	442	(12)	578	(36)
Unrealized appreciation (depreciation) after reclassification adjustment	(4,344)	694	(8,996)	(1,623)
Change in:
Cumulative foreign currency translation adjustment	(777)	308	(710)	330
Postretirement benefit liability adjustment	5	(9)	24	(37)
Other comprehensive income (loss), before income tax	(5,116)	993	(9,682)	(1,330)
Income tax (expense) benefit related to OCI items	245	(129)	1,057	283
Other comprehensive income (loss)	(4,871)	864	(8,625)	(1,047)
Comprehensive income (loss)	$ (3,656)	$ 3,129	$ (5,436)	$ 3,518
Earnings per share
Basic earnings per share	$ 2.88	$ 5.09	$ 7.53	$ 10.20
Diluted earnings per share	$ 2.86	$ 5.06	$ 7.46	$ 10.13