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]	Postretirement Benefit Costs Not Yet Recognized in Net Income [Member]	Foreign Currency Translation Gains (Losses) [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock, at Cost [Member]
Balance, Beginning of Year at Dec. 31, 2013			$ 171	$ 21,902	$ 1,225	$ (253)	$ 63		$ (7,383)
Net Income	449			449
Repurchase of Shares									(409)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $3 and $14)			(63)
Change During Period, Net of Tax	222				235	6	(19)
Dividends Declared (per share $.57 and $.50)				(124)
Shares Issued Under Stock-Based Employee Compensation Plans									54
Balance, End of Period at Mar. 31, 2014	16,226	372	108	22,227	1,460	(247)	44	1,257	(7,738)
Balance, Beginning of Year at Dec. 31, 2014	16,296		171	23,520	1,753	(589)	(54)		(8,877)
Net Income	375			375
Repurchase of Shares									(326)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $3 and $14)			(36)
Change During Period, Net of Tax	(50)				109	17	(176)
Dividends Declared (per share $.57 and $.50)				(133)
Shares Issued Under Stock-Based Employee Compensation Plans									36
Balance, End of Period at Mar. 31, 2015	$ 16,162	$ 372	$ 135	$ 23,762	$ 1,862	$ (572)	$ (230)	$ 1,060	$ (9,167)