CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements of Comprehensive Income [Abstract]
Net Income	$ 298	$ 572	$ 1,226	$ 1,554
Other Comprehensive Income (Loss), Net of Tax
Change in Unrealized Appreciation of Investments	131	457	363	620
Change in Unrealized Other-Than-Temporary Impairment Losses on Investments	1	3	2	7
Foreign Currency Translation Gains (Losses)	(29)	32	56	(62)
Amortization of Net Actuarial Loss and Prior Service Cost Included in Net Postretirement Benefit Costs	12	10	34	29
Total Other Comprehensive Income (Loss), Net of Tax	115	502	455	594
Comprehensive Income	$ 413	$ 1,074	$ 1,681	$ 2,148