Shareholders' Equity (Schedule Of Components Of Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Comprehensive Income (Loss) [Line Items]
Balance	$ 21,129	$ 19,426	$ 15,595
Foreign currency translation adjustment and other	(178)	(18)	567
Net unrealized gain (loss) on designated hedges	47	(6)	(24)
Balance	21,533	21,129	19,426
Foreign Currency Translation Adjustment And Other [Member]
Other Comprehensive Income (Loss) [Line Items]
Balance	1,353	1,374	808
Foreign currency translation adjustment and other	(179)	(21)	566
Balance	1,174	1,353	1,374
Unamortized Losses And Prior Service Costs For Post-Retirement Benefit Plans [Member]
Other Comprehensive Income (Loss) [Line Items]
Balance	(1,384)	(1,275)	(1,171)
Net change in unrecognized postretirement benefit plans	(92)	(109)	(104)
Balance	(1,476)	(1,384)	(1,275)
Net Unrealized Gains (Losses) On Investments [Member]
Other Comprehensive Income (Loss) [Line Items]
Balance	(29)	(33)	(39)
Net unrealized gain on investments	13	4	6
Balance	(16)	(29)	(33)
Net Unrealized Gains (Losses) On Designated Hedges [Member]
Other Comprehensive Income (Loss) [Line Items]
Balance	(29)	(23)	1
Net unrealized gain (loss) on designated hedges	47	(6)	(24)
Balance	18	(29)	(23)
Accumulated Other Comprehensive Income (Loss) [Member]
Other Comprehensive Income (Loss) [Line Items]
Balance	(89)	43	(401)
Foreign currency translation adjustment and other	(179)	(21)	566
Net unrealized gain on investments	13	4	6
Net unrealized gain (loss) on designated hedges	47	(6)	(24)
Net change in unrecognized postretirement benefit plans	(92)	(109)	(104)
Balance	$ (300)	$ (89)	$ 43