Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Investments
Fixed maturities, at fair value (amortized cost: 2011-$8,084; 2010-$7,888)	$ 8,779	$ 8,383
Equity securities, at fair value (cost: 2011-$2,162; 2010-$2,286)	2,956	3,041
Other invested assets	66	84
Total investments	11,801	11,508
Cash and cash equivalents	438	385
Investment income receivable	119	119
Finance receivable	76	73
Premiums receivable	1,087	1,015
Reinsurance receivable	622	572
Prepaid reinsurance premiums	24	18
Deferred policy acquisition costs	510	488
Land, building and equipment, net, for company use (accumulated depreciation: 2011-$376; 2010-$352)	227	229
Other assets	93	67
Separate accounts	671	621
Total assets	15,668	15,095
Insurance reserves
Loss and loss expense reserves	4,339	4,200
Life policy reserves	2,214	2,034
Unearned premiums	1,633	1,553
Other liabilities	517	539
Deferred income tax	314	260
Note payable	104	49
Long-term debt and capital lease obligation	821	807
Separate accounts	671	621
Total liabilities	10,613	10,063
Commitments and contingent liabilities (Note 16)
SHAREHOLDERS' EQUITY
Common stock, par value-$2 per share; (authorized: 2011-500 million shares, 2010-500 million shares; issued: 2011-196 million shares, 2010-196 million shares)	393	393
Paid-in capital	1,096	1,091
Retained earnings	3,885	3,980
Accumulated other comprehensive income	901	769
Treasury stock at cost (2011-34 million shares, 2010-34 million shares)	(1,220)	(1,201)
Total shareholders' equity	5,055	5,032
Total liabilities and shareholders' equity	$ 15,668	$ 15,095