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	1,776			1,776
Repurchase of Shares									(975)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $16 and $28)			(28)
Change During Period, Net of Tax	(716)				(699)	46	(63)
Dividends Declared (per share $1.50 and $1.32)				(342)
Shares Issued Under Stock-Based Employee Compensation Plans									79
Balance, End of Period at Sep. 30, 2013	15,621	372	150	21,443	1,314	(671)	72	715	(7,059)
Balance, Beginning of Year at Dec. 31, 2013	16,097	372	171	21,902	1,225	(253)	63		(7,383)
Net Income	1,542			1,542
Repurchase of Shares									(1,209)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $16 and $28)			(20)
Change During Period, Net of Tax	403				427	17	(41)
Dividends Declared (per share $1.50 and $1.32)				(365)
Shares Issued Under Stock-Based Employee Compensation Plans									58
Balance, End of Period at Sep. 30, 2014	$ 16,506	$ 372	$ 151	$ 23,079	$ 1,652	$ (236)	$ 22	$ 1,438	$ (8,534)