Consolidated Statement of Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues:
Property and casualty insurance net earned premiums	$ 1,507	$ 1,393	$ 2,944	$ 2,695
Net investment income	198	168	415	398
Realized gains (losses) on:
Realized gains (losses) on securities	(2)	(93)	(48)	(108)
Income of managed investment entities:
Investment income	112	54	216	100
Gain (loss) on change in fair value of assets/liabilities	0	(15)	(4)	(20)
Other income	25	32	57	62
Total revenues	1,840	1,539	3,580	3,127
Property and casualty insurance:
Losses and loss adjustment expenses	905	774	1,725	1,467
Commissions and other underwriting expenses	485	432	958	846
Interest charges on borrowed money	19	23	38	46
Expenses of managed investment entities	103	47	198	86
Other expenses	73	57	142	115
Total costs and expenses	1,585	1,333	3,061	2,560
Earnings before income taxes	255	206	519	567
Provision for income taxes	55	39	107	110
Net Earnings	$ 200	$ 167	$ 412	$ 457
Earnings per Common Share:
Basic (USD per share)	$ 2.35	$ 1.97	$ 4.84	$ 5.37
Diluted (USD per share)	$ 2.34	$ 1.96	$ 4.83	$ 5.36
Average number of Common Shares:
Basic (shares)	85.1	85.1	85.2	85.1
Diluted (shares)	85.2	85.3	85.3	85.3