Consolidated Statement of Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Property and casualty insurance net earned premiums	$ 1,161	$ 1,065	$ 2,268	$ 2,087
Life, accident and health net earned premiums	6	5	12	11
Net investment income	530	460	1,025	895
Realized gains (losses) on:
Realized gains (losses) on securities	31	8	(62)	11
Income (loss) of managed investment entities:
Investment income	64	50	122	101
Gain (loss) on change in fair value of assets/liabilities	(2)	11	(5)	11
Other income	43	47	92	106
Total revenues	1,833	1,646	3,452	3,222
Costs and Expenses:
Property and casualty insurance: Losses and loss adjustment expenses	693	635	1,334	1,244
Property and casualty insurance: Commissions and other underwriting expenses	400	366	781	705
Annuity benefits	260	224	442	420
Life, accident and health benefits	11	6	22	15
Annuity and supplemental insurance acquisition expenses	50	48	132	101
Interest charges on borrowed money	16	23	31	44
Expenses of managed investment entities	54	51	102	92
Other expenses	89	88	174	173
Total costs and expenses	1,573	1,441	3,018	2,794
Earnings before income taxes	260	205	434	428
Provision for income taxes	52	60	85	128
Net earnings, including noncontrolling interests	208	145	349	300
Less: Net earnings (losses) attributable to noncontrolling interests	(2)	0	(6)	2
Net Earnings Attributable to Shareholders	$ 210	$ 145	$ 355	$ 298
Earnings Attributable to Shareholders per Common Share:
Basic (USD per share)	$ 2.36	$ 1.64	$ 3.99	$ 3.40
Diluted (USD per share)	$ 2.31	$ 1.61	$ 3.92	$ 3.32
Average number of Common Shares:
Basic (shares)	89.0	87.8	88.8	87.5
Diluted (shares)	90.7	89.8	90.5	89.6
Cash dividends per Common Share (USD per share)	$ 1.85	$ 1.8125	$ 2.20	$ 2.125
Supplemental disclosure of Realized gains on securities:
Realized gains (losses) before impairments	$ 31	$ 17	$ (61)	$ 26
Losses on securities with impairment	0	(10)	(1)	(16)
Non-credit portion recognized in other comprehensive income (loss)	0	1	0	1
Impairment charges recognized in earnings	0	(9)	(1)	(15)
Total realized gains (losses) on securities	$ 31	$ 8	$ (62)	$ 11