Consolidated Statements Of Operations and Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues
Net premiums written	$ 11,951	$ 10,293	$ 22,661	$ 19,482
Increase in unearned premiums	(952)	(744)	(1,520)	(1,196)
Net premiums earned	10,999	9,549	21,141	18,286
Net investment income	1,145	888	2,252	1,710
Net realized gains (losses)	(304)	(503)	(381)	(480)
Market risk benefits gains (losses)	(7)	(33)	(122)	16
Total revenues	11,833	9,901	22,890	19,532
Expenses
Losses and loss expenses	5,683	5,206	10,831	9,770
Policy benefits (includes remeasurement losses of $5, nil, $4, and $6)	830	361	1,627	734
Policy acquisition costs	2,016	1,726	3,964	3,445
Administrative expenses	969	818	1,899	1,596
Interest expense	165	134	325	266
Other (income) expense	(100)	101	(396)	(211)
Amortization of purchased intangibles	70	71	142	142
Cigna integration expenses	15	3	37	3
Total expenses	9,648	8,420	18,429	15,745
Income before income tax	2,185	1,481	4,461	3,787
Income tax expense	392	291	776	644
Net income	1,793	1,190	3,685	3,143
Other comprehensive income (loss):
Change in unrealized depreciation	(1,194)	(4,344)	592	(8,996)
Current discount rate on future policy benefits	(35)	632	(186)	1,067
Instrument-specific credit risk on market risk benefits	11	17	8	40
Cumulative foreign currency translation adjustment	215	(756)	38	(689)
Other, including postretirement benefit liability adjustment	48	5	15	24
Other comprehensive income (loss), before income tax	(955)	(4,446)	467	(8,554)
Income tax (expense) benefit related to OCI items	28	183	(104)	962
Other comprehensive income (loss)	(927)	(4,263)	363	(7,592)
Comprehensive income (loss)	$ 866	$ (3,073)	$ 4,048	$ (4,449)
Earnings per share
Basic earnings per share	$ 4.35	$ 2.82	$ 8.92	$ 7.42
Diluted earnings per share	$ 4.32	$ 2.80	$ 8.84	$ 7.35