Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Revenues
Premiums Earned	$ 11,838	$ 11,644		$ 11,215
Investment Income	1,556	1,644		1,665
Other Revenues	8	9		13
Realized Investment Gains (Losses), Net
Total Other-Than-Temporary Impairment Losses on Investments	(40)	(22)		(6)
Other-Than-Temporary Impairment Losses on Investments Recognized in Other Comprehensive Income	(5)	(1)		(5)
Other Realized Investment Gains, Net	238	311		437
Total Realized Investment Gains, Net	193	288		426
TOTAL REVENUES	13,595	13,585		13,319
Losses and Expenses
Losses and Loss Expenses	7,507	7,407		6,499
Amortization of Deferred Policy Acquisition Costs	2,411	2,330	[1]	2,183	[1]
Other Insurance Operating Costs and Expenses	1,362	1,312	[1]	1,309	[1]
Investment Expenses	38	39		35
Other Expenses	11	11		15
Corporate Expenses	270	287		290
TOTAL LOSSES AND EXPENSES	11,599	11,386		10,331
INCOME BEFORE FEDERAL AND FOREIGN INCOME TAX	1,996	2,199		2,988
Federal and Foreign Income Tax	451	521		814
NET INCOME	$ 1,545	$ 1,678		$ 2,174
Net Income Per Share
Basic	$ 5.73	$ 5.80		$ 6.81
Diluted	$ 5.69	$ 5.76		$ 6.76

[1] As Adjusted