Equity Activity: (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 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	24		(245)
Amount reclassified from accumulated other comprehensive income	421		539
Total change for the period	446		293
Balance at the End of the Period	(21,156)		(25,466)
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	54		232
Amount reclassified from accumulated other comprehensive income	1		(35)
Total change for the period	55		197
Balance at the End of the Period	(111)		107
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	(51)	[1]	(489)	[1]
Amount reclassified from accumulated other comprehensive income	0	[1]	0	[1]
Total change for the period	(51)	[1]	(489)	[1]
Balance at the End of the Period	281	[1]	1,243	[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	21		12
Amount reclassified from accumulated other comprehensive income	417		574
Total change for the period	439		586
Balance at the End of the Period	(21,328)		(26,820)
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	0		(1)
Amount reclassified from accumulated other comprehensive income	3		0
Total change for the period	3		0
Balance at the End of the Period	$ 2		$ 4

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