Consolidated Statement of Earnings (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Property and casualty insurance premiums	$ 2,847	$ 2,759	$ 2,550
Life, accident and health premiums	318	430	451
Investment income	1,312	1,241	1,191
Realized gains (losses) on:
Securities	210	76	101
Subsidiaries	161	(3)	(13)
Income (loss) of managed investment entities:
Investment income	125	105	93
Loss on change in fair value of assets/liabilities	(94)	(33)	(70)
Other income	183	175	194
Total revenues	5,062	4,750	4,497
Costs and Expenses:
Property and casualty insurance: Losses and loss adjustment expenses	1,873	1,744	1,457
Property and casualty insurance: Commissions and other underwriting expenses	887	835	787
Annuity benefits	541	510	444
Life, accident and health benefits	365	369	368
Annuity and supplemental insurance acquisition expenses	290	202	219
Interest charges on borrowed money	85	85	78
Expenses of managed investment entities	80	71	55
Other operating and general expenses	404	376	395
Total costs and expenses	4,525	4,192	3,803
Operating earnings before income taxes	537	558	694
Provision for income taxes	135	239	268
Net earnings, including noncontrolling interests	402	319	426
Less: Net earnings (loss) attributable to noncontrolling interests	(86)	(23)	(56)
Net Earnings Attributable to Shareholders	488	342	482
Earnings Attributable to Shareholders per Common Share:
Basic	$ 5.18	$ 3.37	$ 4.41
Diluted	$ 5.09	$ 3.32	$ 4.36
Average number of Common Shares:
Basic	94.2	101.3	109.2
Diluted	95.9	102.9	110.5
Cash dividends per Common Share	$ 0.97	$ 0.6625	$ 0.575
Supplemental disclosure of Realized gains (losses) on securities:
Realized gains before impairments	236	128	163
Losses on securities with impairment	(27)	(31)	(50)
Non-credit portion recognized in other comprehensive income (loss)	1	(21)	(12)
Impairment charges recognized in earnings	(26)	(52)	(62)
Total realized gains on securities	$ 210	$ 76	$ 101