CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY (USD $) In Millions	Total	Common Stock [Member]	Paid-In-Surplus [Member]	Retained Earnings [Member]	Unrealized Appreciation of Investments Including Unrealized Other-Than-Temporary Impairment Losses [Member]	Foreign Currency Translation Gains (Losses) [Member]	Postretirement Benefit Costs Not Yet Recognized in Net Income [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock, at Cost [Member]
Balance, Beginning of Year at Dec. 31, 2011		$ 372	$ 190	$ 18,903	$ 1,736	$ 146	$ (687)		$ (5,359)
Net Income	506			506
Repurchase of Shares									(301)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $27 and $19)			(66)
Change During Period, Net of Tax	60				55	(9)	14
Dividends Declared (per share $.44 and $.41)				(112)
Shares Issued Under Stock-Based Employee Compensation Plans									102
Balance, End of Period at Mar. 31, 2012	15,490	372	124	19,297	1,791	137	(673)	1,255	(5,558)
Balance, Beginning of Year at Dec. 31, 2012	15,827	372	178	20,009	2,013	135	(717)		(6,163)
Net Income	656			656
Repurchase of Shares									(326)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $27 and $19)			(73)
Change During Period, Net of Tax	(29)				4	(50)	17
Dividends Declared (per share $.44 and $.41)				(115)
Shares Issued Under Stock-Based Employee Compensation Plans									76
Balance, End of Period at Mar. 31, 2013	$ 16,016	$ 372	$ 105	$ 20,550	$ 2,017	$ 85	$ (700)	$ 1,402	$ (6,413)