Consolidated Statement of Earnings - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Property and casualty insurance net earned premiums	$ 4,224	$ 3,878	$ 3,204
Life, accident and health net earned premiums	104	108	114
Net investment income	1,633	1,501	1,346
Realized gains (losses) on:
Securities	(19)	52	221
Subsidiaries	(161)	0	(4)
Income (loss) of managed investment entities:
Investment income	155	116	128
Loss on change in fair value of assets/liabilities	(34)	(44)	(14)
Other income	243	122	108
Total revenues	6,145	5,733	5,103
Costs and Expenses:
Property and casualty insurance: Losses and loss adjustment expenses	2,695	2,494	2,040
Property and casualty insurance: Commissions and other underwriting expenses	1,320	1,172	1,019
Annuity benefits	732	648	531
Life, accident and health benefits	131	164	160
Annuity and supplemental insurance acquisition expenses	179	193	178
Interest charges on borrowed money	74	73	71
Expenses of managed investment entities	112	82	89
Other expenses	337	281	326
Total costs and expenses	5,580	5,107	4,414
Earnings before income taxes	565	626	689
Provision for income taxes	195	220	236
Net earnings, including noncontrolling interests	370	406	453
Less: Net earnings (loss) attributable to noncontrolling interests	18	(46)	(18)
Net Earnings Attributable to Shareholders	$ 352	$ 452	$ 471
Earnings Attributable to Shareholders per Common Share:
Basic (USD per share)	$ 4.02	$ 5.07	$ 5.27
Diluted (USD per share)	$ 3.94	$ 4.97	$ 5.16
Average number of Common Shares:
Basic (shares)	87.6	89.0	89.3
Diluted (shares)	89.4	91.0	91.2
Cash dividends per Common Share (USD per share)	$ 2.03	$ 1.91	$ 1.805
Supplemental disclosure of Realized gains (losses) on securities:
Realized gains before impairments	$ 106	$ 88	$ 233
Losses on securities with impairment	(125)	(36)	(14)
Non-credit portion recognized in other comprehensive income (loss)	0	0	2
Impairment charges recognized in earnings	(125)	(36)	(12)
Total realized gains (losses) on securities	$ (19)	$ 52	$ 221