Consolidated Statement of Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues:
Property and casualty insurance net earned premiums	$ 1,585	$ 1,507	$ 3,131	$ 2,944
Net investment income	188	198	386	415
Realized gains (losses) on securities	(2)	(2)	12	(48)
Income of managed investment entities:
Investment income	98	112	197	216
Gain (loss) on change in fair value of assets/liabilities	4	0	14	(4)
Other income	27	25	66	57
Total revenues	1,900	1,840	3,806	3,580
Property and casualty insurance:
Commissions and other underwriting expenses	506	485	1,009	958
Interest charges on borrowed money	19	19	38	38
Expenses of managed investment entities	90	103	182	198
Other expenses	77	73	153	142
Total costs and expenses	1,629	1,585	3,231	3,061
Earnings before income taxes	271	255	575	519
Provision for income taxes	62	55	124	107
Net Earnings	$ 209	$ 200	$ 451	$ 412
Earnings per Common Share:
Total basic earnings (USD per share)	$ 2.49	$ 2.35	$ 5.38	$ 4.84
Total diluted earnings (USD per share)	$ 2.49	$ 2.34	$ 5.38	$ 4.83
Average number of Common Shares:
Basic (shares)	83.9	85.1	83.8	85.2
Diluted (shares)	83.9	85.2	83.9	85.3
Property and casualty insurance
Property and casualty insurance:
Losses and loss adjustment expenses	$ 937	$ 905	$ 1,849	$ 1,725