Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments
Fixed maturities, at fair value (amortized cost: 2015—$8,961; 2014—$8,871)	$ 9,596	$ 9,460
Equity securities, at fair value (cost: 2015—$2,748; 2014—$2,728)	4,789	4,858
Short-term investments, at fair value (amortized cost: 2015—$25; 2014—$0)	25	0
Other invested assets	66	68
Total investments	14,476	14,386
Cash and cash equivalents	640	591
Investment income receivable	123	123
Finance receivable	70	75
Premiums receivable	1,433	1,405
Reinsurance recoverable	539	545
Prepaid reinsurance premiums	29	29
Deferred policy acquisition costs	571	578
Land, building and equipment, net, for company use (accumulated depreciation: 2015—$452; 2014—$446)	189	194
Other assets	63	75
Separate accounts	764	752
Total assets	18,897	18,753
Insurance reserves
Loss and loss expense reserves	4,623	4,485
Life policy and investment contract reserves	2,514	2,497
Unearned premiums	2,109	2,082
Other liabilities	581	648
Deferred income tax	824	840
Note payable	49	49
Long-term debt and capital lease obligations	825	827
Separate accounts	764	752
Total liabilities	12,289	12,180
Commitments and contingent liabilities (Note 12)	0	0
Shareholders' Equity
Common stock, par value—$2 per share; (authorized: 2014 and 2013—500 million shares; issued: 2015 and 2014—198.3 million shares)	397	397
Paid-in capital	1,210	1,214
Retained earnings	4,557	4,505
Accumulated other comprehensive income	1,716	1,744
Treasury stock at cost (2015— 34.0 million shares and 2014—34.6 million shares)	(1,272)	(1,287)
Total shareholders' equity	6,608	6,573
Total liabilities and shareholders' equity	$ 18,897	$ 18,753