Consolidated Statements Of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues
Net premiums written	$ 9,199	$ 8,662
Increase in unearned premiums	(453)	(441)
Net premiums earned	8,746	8,221
Net investment income	822	863
Net realized gains (losses) (includes $(136) and $24 reclassified from AOCI)	101	887
Total revenues	9,669	9,971
Expenses
Losses and loss expenses	4,787	5,053
Policy benefits	145	167
Policy acquisition costs	1,737	1,665
Administrative expenses	778	744
Interest expense	132	122
Other (income) expense	(310)	(490)
Amortization of purchased intangibles	71	72
Total expenses	7,340	7,333
Income before income tax	2,329	2,638
Income tax expense (includes $(22) and $4 on unrealized gains and losses reclassified from AOCI)	355	338
Net income	1,974	2,300
Other comprehensive loss
Unrealized depreciation	(4,788)	(2,293)
Reclassification adjustment for net realized (gains) losses included in net income	136	(24)
Unrealized appreciation (depreciation) after reclassification adjustment	(4,652)	(2,317)
Change in:
Cumulative foreign currency translation adjustment	67	22
Postretirement benefit liability adjustment	19	(28)
Other comprehensive loss, before income tax	(4,566)	(2,323)
Income tax benefit related to OCI items	812	412
Other comprehensive loss	(3,754)	(1,911)
Comprehensive income (loss)	$ (1,780)	$ 389
Earnings per share
Basic earnings per share	$ 4.64	$ 5.10
Diluted earnings per share	$ 4.59	$ 5.07