Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues
Premiums Earned	$ 11,644	$ 11,215	$ 11,331
Investment Income	1,644	1,665	1,649
Other Revenues	9	13	13
Realized Investment Gains (Losses), Net
Total Other-Than-Temporary Impairment Losses on Investments	(22)	(6)	(132)
Other-Than-Temporary Impairment Losses on Investments Recognized in Other Comprehensive Income	(1)	(5)	20
Other Realized Investment Gains, Net	311	437	135
Total Realized Investment Gains, Net	288	426	23
Total Revenues	13,585	13,319	13,016
Losses and Expenses
Losses and Loss Expenses	7,407	6,499	6,268
Amortization of Deferred Policy Acquisition Costs	3,225	3,067	3,021
Other Insurance Operating Costs and Expenses	417	425	416
Investment Expenses	39	35	39
Other Expenses	11	15	16
Corporate Expenses	287	290	294
TOTAL LOSSES AND EXPENSES	11,386	10,331	10,054
INCOME BEFORE FEDERAL AND FOREIGN INCOME TAX	2,199	2,988	2,962
Federal and Foreign Income Tax	521	814	779
NET INCOME	$ 1,678	$ 2,174	$ 2,183
Net Income Per Share
Basic	$ 5.80	$ 6.81	$ 6.24
Diluted	$ 5.76	$ 6.76	$ 6.18