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 [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock, at Cost [Member]
Balance, Beginning of Year at Dec. 31, 2012		$ 372	$ 178	$ 20,009	$ 2,013	$ (717)	$ 135		$ (6,163)
Net Income	1,235			1,235
Repurchase of Shares									(649)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $14 and $27)			(52)
Change During Period, Net of Tax	(687)				(696)	31	(22)
Dividends Declared (per share $1.00 and $.88)				(229)
Shares Issued Under Stock-Based Employee Compensation Plans									78
Balance, End of Period at Jun. 30, 2013	15,523	372	126	21,015	1,317	(686)	113	744	(6,734)
Balance, Beginning of Year at Dec. 31, 2013	16,097	372	171	21,902	1,225	(253)	63		(7,383)
Net Income	948			948
Repurchase of Shares									(784)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $14 and $27)			(42)
Change During Period, Net of Tax	469				473	11	(15)
Dividends Declared (per share $1.00 and $.88)				(246)
Shares Issued Under Stock-Based Employee Compensation Plans									56
Balance, End of Period at Jun. 30, 2014	$ 16,498	$ 372	$ 129	$ 22,604	$ 1,698	$ (242)	$ 48	$ 1,504	$ (8,111)