Equity Activity: (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period					$ (21,602)		$ (25,759)
Other comprehensive income before reclassifications					(674)		(793)
Amount reclassified from accumulated other comprehensive income					1,299		1,580
Total change for the period	(609)		804		623		788
Balance at the End of the Period	(20,978)		(24,971)		(20,978)		(24,971)
Net Unrealized Gains/(Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period					(165)		(90)
Other comprehensive income before reclassifications					383		(33)
Amount reclassified from accumulated other comprehensive income					61		(81)
Total change for the period					443		(114)
Balance at the End of the Period	277		(204)		277		(204)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period					332	[1]	1,733	[1]
Other comprehensive income before reclassifications					(1,090)	[1]	(980)	[1]
Amount reclassified from accumulated other comprehensive income					0	[1]	0	[1]
Total change for the period					(1,090)	[1]	(980)	[1]
Balance at the End of the Period	(758)	[1]	752	[1]	(758)	[1]	752	[1]
Net Change Retirement-Related Benefit Plans
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period					(21,767)		(27,406)
Other comprehensive income before reclassifications					32		218
Amount reclassified from accumulated other comprehensive income					1,235		1,664
Total change for the period					1,267		1,883
Balance at the End of the Period	20,501		(25,523)		20,501		(25,523)
Net Unrealized Gains/(Losses) on Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period					(1)		4
Other comprehensive income before reclassifications					1		2
Amount reclassified from accumulated other comprehensive income					3		(3)
Total change for the period					4		(1)
Balance at the End of the Period	$ 3		$ 3		$ 3		$ 3

[1] Foreign currency translation adjustments are presented gross except for any associated hedges which are presented net of tax.