Equity Activity: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012	Jun. 30, 2011
Other comprehensive income/(loss), before tax
Foreign currency translation adjustments, before tax	$ (724)		$ 350		$ (337)	$ 826
Net changes related to available-for-sale securities, before tax
Unrealized gains/(losses) arising during the period, before tax	(3)		(7)		3	(14)
Reclassification of (gains)/losses to net income, before tax	(2)		(29)		(16)	(232)
Subsequent changes in previously impaired securities arising during the period, before tax	9		0		27	11
Total net changes related to available-for-sale securities	4		(35)	[1]	14	(234)	[1]
Unrealized gains/(losses) on cash flow hedges, before tax
Unrealized gains/(losses) arising during the period, before tax	68		(217)		119	(454)
Reclassification of (gains)/losses to net income, before tax	(111)		227		(135)	327
Total unrealized gains/(losses) on cash flow hedges	(42)	[1]	10		(16)	(127)
Retirement-related benefit plans, before tax
Prior service costs/(credits), before tax	0		(31)		0	(32)
Net (losses)/gains arising during the period, before tax	70		585		65	606
Curtailments and settlements, before tax	0		4		0	13
Amortization of prior service (credits)/cost, before tax	(37)		(39)		(74)	(77)
Amortization of net (gains)/losses, before tax	613		458		1,232	932
Total retirement-related benefit plans	647	[1]	977		1,223	1,441	[1]
Other comprehensive income/(loss), before tax	(115)		1,301	[1]	884	1,906
Other comprehensive income/(loss), tax
Foreign currency translation adjustments, tax	(58)		39		(48)	97
Net changes related to available-for-sale securities, tax
Unrealized gains/(losses) arising during the period, tax	1		4		(1)	6
Reclassification of (gains)/losses to net income, tax	1		10		6	88
Subsequent changes in previously impaired securities arising during the period, tax	(3)		0		(10)	(4)
Total net changes related to available-for-sale securities, tax	(1)		13		(5)	89
Unrealized gains/(losses) on cash flow hedges, tax
Unrealized gains/(losses) arising during the period, tax	(15)		77		(45)	153
Reclassification of (gains)/losses to net income, tax	37		(78)		44	(113)
Total unrealized gains/(losses) on cash flow hedges, tax	21		(2)		(1)	40
Retirement-related benefit plans, tax
Prior service costs/(credits), tax	0		11		0	11
Net (losses)/gains arising during the period, tax	(26)		(204)		(23)	(210)
Curtailments and settlements, tax	0		(1)		0	(4)
Amortization of prior service (credits)/cost, tax	13		14		27	27
Amortization of net (gains)/losses, tax	(217)		(164)		(446)	(324)
Total retirement-related benefit plans, tax	(229)		(344)		(443)	(500)
Other comprehensive income/(loss), tax	(268)		(292)		(497)	(272)
Other comprehensive income/(loss), net of tax:
Foreign currency translation adjustments, net of tax	(782)		389		(385)	924
Net changes related to available-for-sale securities, net of tax
Unrealized gains/(losses) arising during the period, net of tax	(2)		(3)		2	(9)
Reclassification of (gains)/losses to net income, net of tax	(1)		(19)		(10)	(144)
Subsequent changes in previously impaired securities arising during the period, net of tax	6		0		17	7
Total net changes related to available-for-sale securities, net of tax	2		(22)		9	(145)
Unrealized gains/(losses) on cash flow hedges, net of tax
Unrealized gains/(losses) arising during the period, net of tax	53		(141)		74	(301)
Reclassification of (gains)/losses to net income, net of tax	(74)		149		(91)	214
Total unrealized gains/(losses) on cash flow hedges, net of tax	(21)		8		(17)	(87)
Retirement-related benefit plans, net of tax
Prior service costs/(credits), net of tax	0		(20)		0	(21)
Net (losses)/gains arising during the period, net of tax	45		382		41	395
Curtailments and settlements, net of tax	0		2		0	8
Amortization of prior service (credits)/cost, net of tax	(24)		(25)		(47)	(50)
Amortization of net (gains)/losses, net of tax	397		294		786	608
Total retirement-related benefit plans, net of tax	418		634		780	942
Other comprehensive income/(loss)	$ (383)		$ 1,010	[1]	$ 387	$ 1,634

[1] Amounts may not add due to rounding.