Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Investments
Fixed maturities, at fair value (amortized cost: 2012-$8,252; 2011-$8,084)	$ 9,025	$ 8,779
Equity securities, at fair value (cost: 2012-$2,248; 2011-$2,162)	3,139	2,956
Other invested assets	67	66
Total investments	12,231	11,801
Cash and cash equivalents	263	438
Investment income receivable	118	119
Finance receivable	78	76
Premiums receivable	1,210	1,087
Reinsurance receivable	575	622
Prepaid reinsurance premiums	24	24
Deferred policy acquisition costs	484	477
Land, building and equipment, net, for company use (accumulated depreciation: 2012-$390; 2011-$376)	229	227
Other assets	179	93
Separate accounts	698	671
Total assets	16,089	15,635
Insurance reserves
Loss and loss expense reserves	4,396	4,339
Life policy and investment contract reserves	2,256	2,214
Unearned premiums	1,762	1,633
Other liabilities	539	517
Deferred income tax	359	303
Note payable	104	104
Long-term debt and capital lease obligations	831	821
Separate accounts	698	671
Total liabilities	10,945	10,602
Commitments and contingent liabilities (Note 13)
SHAREHOLDERS' EQUITY
Common stock, par value-$2 per share; (authorized: 2012 and 2011-500 million shares; issued and outstanding: 2012-197 million shares and 2011-196 million shares)	393	393
Paid-in capital	1,106	1,096
Retained earnings	3,851	3,863
Accumulated other comprehensive income	1,010	901
Treasury stock at cost (2012-34 million shares and 2011-34 million shares)	(1,216)	(1,220)
Total shareholders' equity	5,144	5,033
Total liabilities and shareholders' equity	$ 16,089	$ 15,635