Equity Activity: (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 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					379		(1,067)
Amount reclassified from accumulated other comprehensive income					853		1,050
Total change for the period	787		(309)		1,232		(16)
Balance at the End of the Period	(20,369)		(25,774)		(20,369)		(25,774)
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					41		231
Amount reclassified from accumulated other comprehensive income					24		(63)
Total change for the period					64		168
Balance at the End of the Period	(101)		78		(101)		78
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					307	[1]	(1,448)	[1]
Amount reclassified from accumulated other comprehensive income					0	[1]	0	[1]
Total change for the period					307	[1]	(1,448)	[1]
Balance at the End of the Period	639	[1]	284	[1]	639	[1]	284	[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					31		150
Amount reclassified from accumulated other comprehensive income					825		1,115
Total change for the period					857		1,265
Balance at the End of the Period	(20,910)		(26,141)		(20,910)		(26,141)
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		0
Amount reclassified from accumulated other comprehensive income					3		0
Total change for the period					3		0
Balance at the End of the Period	$ 3		$ 4		$ 3		$ 4

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