Equity Activity: (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period					$ (25,759)		$ (21,885)
Other comprehensive income before reclassifications					(793)		264
Amount reclassified from accumulated other comprehensive income					1,580		900
Total change for the period	804		778		788		1,165
Balance at the End of the Period	(24,971)		(20,720)		(24,971)		(20,720)
Net Unrealized Gains/(Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period					(90)		71
Other comprehensive income before reclassifications					(33)		31
Amount reclassified from accumulated other comprehensive income					(81)		(164)
Total change for the period					(114)		(133)
Balance at the End of the Period	(204)		(61)		(204)		(61)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period					1,733	[1]	1,767	[1]
Other comprehensive income before reclassifications					(980)	[1]	172	[1]
Amount reclassified from accumulated other comprehensive income					0	[1]	0	[1]
Total change for the period					(980)	[1]	172	[1]
Balance at the End of the Period	752	[1]	1,939	[1]	752	[1]	1,939	[1]
Net Change Retirement-Related Benefit Plans
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period					(27,406)		(23,737)
Other comprehensive income before reclassifications					218		41
Amount reclassified from accumulated other comprehensive income					1,664		1,090
Total change for the period					1,883		1,132
Balance at the End of the Period	(25,523)		(22,606)		(25,523)		(22,606)
Net Unrealized Gains/(Losses) on Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period					4		13
Other comprehensive income before reclassifications					2		20
Amount reclassified from accumulated other comprehensive income					(3)		(26)
Total change for the period					(1)		(6)
Balance at the End of the Period	$ 3		$ 7		$ 3		$ 7

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