CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues
Premiums Earned	$ 3,004	$ 2,951
Investment Income	372	401
Other Revenues	3	2
Realized Investment Gains (Losses), Net
Total Other-Than-Temporary Impairment Losses on Investments	(2)	(5)
Other-Than-Temporary Impairment Losses on Investments Recognized in Other Comprehensive Income		(1)
Other Realized Investment Gains, Net	140	62
Total Realized Investment Gains, Net	138	56
Total Revenues	3,517	3,410
Losses and Expenses
Losses and Loss Expenses	1,568	1,707
Amortization of Deferred Policy Acquisition Costs	587	576
Other Insurance Operating Costs and Expenses	359	366
Investment Expenses	13	11
Other Expenses	6	3
Corporate Expenses	68	68
Total Losses and Expenses	2,601	2,731
Income Before Federal and Foreign Income Tax	916	679
Federal and Foreign Income Tax	260	173
Net Income	$ 656	$ 506
Net Income Per Share
Basic	$ 2.49	$ 1.85
Diluted	$ 2.48	$ 1.83
Dividends Declared Per Share	$ 0.44	$ 0.41