Consolidated Statement of Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Property and casualty insurance net earned premiums	$ 1,173	$ 1,209
Net investment income	188	104
Realized gains (losses) on securities	77	(328)
Income of managed investment entities:
Investment income	46	59
Gain (loss) on change in fair value of assets/liabilities	2	(13)
Other income	23	24
Total revenues	1,509	1,055
Costs and Expenses:
Losses and loss adjustment expenses	667	707
Commissions and other underwriting expenses	380	420
Interest charges on borrowed money	24	17
Expenses of managed investment entities	39	53
Other expenses	64	43
Total costs and expenses	1,174	1,240
Earnings (loss) from continuing operations before income taxes	335	(185)
Provision (credit) for income taxes	68	(41)
Net earnings (loss) from continuing operations, including noncontrolling interests	267	(144)
Net earnings (loss) from discontinued operations	152	(160)
Net earnings (loss), including noncontrolling interests	419	(304)
Less: Net earnings (loss) from continuing operations attributable to noncontrolling interests	0	(3)
Net Earnings (Loss) Attributable to Shareholders	$ 419	$ (301)
Earnings (Losses) Attributable to Shareholders per Basic Common Share from:
Basic (USD per share) from continuing operations	$ 3.11	$ (1.57)
Basic (USD per share) from discontinued operations	1.77	(1.77)
Basic (USD per share)	4.88	(3.34)
Earnings (Losses) Attributable to Shareholders per Diluted Common Share:
Diluted (USD per share) from continuing operations)	3.08	(1.57)
Diluted (USD per share) from discontinued operations	1.76	(1.77)
Diluted (USD per share)	$ 4.84	$ (3.34)
Average number of Common Shares:
Basic (shares)	85.9	90.3
Diluted (shares)	86.6	90.3