Shareholders' Equity (Schedule Of Changes In Capital Stock) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Balance	$ 21,129	$ 19,426	$ 15,595
Shares issued to benefit plans and for option exercises	111	174	146
Shares purchased for treasury	(719)	(779)
Other, net	(29)	(11)	(3)
Balance	21,533	21,129	19,426
Common Stock [Member]
Class of Stock [Line Items]
Balance	818	813	808
Balance, Shares	1,636	1,626	1,616
Shares issued to benefit plans and for option exercises	7	5	5
Shares issued to benefit plans and for option exercises, Shares	13	10	10
Balance	825	818	813
Balance, Shares	1,649	1,636	1,626
Treasury Stock [Member]
Class of Stock [Line Items]
Balance	(2,024)	(1,227)	(1,207)
Balance, Shares	(121)	(65)	(64)
Shares issued to benefit plans and for option exercises	(1)	(7)
Shares purchased for treasury	(719)	(779)
Shares purchased for treasury, Shares	(56)	(55)
Other, net	(29)	(11)	(20)
Other, net, Shares	(2)	(1)	(1)
Balance	$ (2,773)	$ (2,024)	$ (1,227)
Balance, Shares	(179)	(121)	(65)