Equity Activity: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments, before tax	$ (405)	$ 387
Net changes related to available-for-sale securities, before tax
Unrealized gains/(losses) arising during the period, before tax	(3)	6
Reclassification of (gains)/losses to net income, before tax	1	(14)
Subsequent changes in previously impaired securities arising during the period, before tax	1	18
Total net changes related to available-for-sale securities	(1)	10
Unrealized gains/(losses) on cash flow hedges, before tax
Unrealized gains/(losses) arising during the period, before tax	360	51
Reclassification of (gains)/losses to net income, before tax	(56)	(24)
Total unrealized gains/(losses) on cash flow hedges	305	27
Retirement-related benefit plans, before tax
Prior service costs/(credits), before tax	33	0
Net (losses)/gains arising during the period, before tax	(15)	(6)
Amortization of prior service (credits)/costs, before tax	(30)	(37)
Amortization of net (gains)/losses, before tax	886	619
Total retirement-related benefit plans	875	576
Other comprehensive income/(loss), before tax	773	1,000
Other comprehensive income/(loss), tax
Foreign currency translation adjustments, tax	(84)	11
Net changes related to available-for-sale securities, tax
Unrealized gains/(losses) arising during the period, tax	1	(2)
Subsequent changes in previously impaired securities arising during the period, tax	0	(7)
Total net changes related to available-for-sale securities, tax	0	(4)
Unrealized gains/(losses) on cash flow hedges, tax
Unrealized gains/(losses) arising during the period, tax	(128)	(30)
Total unrealized gains/(losses) on cash flow hedges, tax	(108)	(23)
Retirement-related benefit plans, tax
Prior service costs/(credits), tax	(11)	0
Net (losses)/gains arising during the period, tax	5	2
Amortization of prior service (credits)/costs, tax	10	14
Amortization of net (gains)/losses, tax	(293)	(229)
Total retirement-related benefit plans, tax	(289)	(213)
Other comprehensive income/(loss), tax	(480)	(229)
Other comprehensive income/(loss), net of tax
Foreign currency translation adjustments, net of tax	(489)	398
Net changes related to available-for-sale securities, net of tax
Unrealized gains/(losses) arising during the period, net of tax	(2)	4
Reclassification of (gains)/losses to net income, net of tax	0	(8)
Subsequent changes in previously impaired securities arising during the period, net of tax	1	11
Total net changes related to available-for-sale securities, net of tax	0	6
Unrealized gains/(losses) on cash flow hedges, net of tax
Unrealized gains/(losses) arising during the period, net of tax	232	21
Total unrealized gains/(losses) on cash flow hedges, net of tax	197	4
Retirement-related benefit plans, net of tax
Prior service costs/(credits), net of tax	22	0
Net (losses)/gains arising during the period, net of tax	(10)	(4)
Amortization of prior service (credits)/costs, net of tax	(20)	(24)
Amortization of net (gains)/losses, net of tax	594	390
Total retirement-related benefit plans, net of tax	586	363
Other comprehensive income/(loss)	293	770	[1]
Cost of sales
Unrealized gains/(losses) on cash flow hedges, before tax
Reclassification of (gains)/losses to net income, before tax	(9)	(5)
Unrealized gains/(losses) on cash flow hedges, tax
Reclassification of (gains)/losses to net income, tax	3	0
Unrealized gains/(losses) on cash flow hedges, net of tax
Reclassification of (gains)/losses to net income, net of tax	(6)	(5)
SG&A expense
Unrealized gains/(losses) on cash flow hedges, before tax
Reclassification of (gains)/losses to net income, before tax	(10)	(2)
Unrealized gains/(losses) on cash flow hedges, tax
Reclassification of (gains)/losses to net income, tax	3	0
Unrealized gains/(losses) on cash flow hedges, net of tax
Reclassification of (gains)/losses to net income, net of tax	(7)	(2)
Other (income) and expense
Net changes related to available-for-sale securities, before tax
Reclassification of (gains)/losses to net income, before tax	1	(14)
Unrealized gains/(losses) on cash flow hedges, before tax
Reclassification of (gains)/losses to net income, before tax	(37)	(20)
Net changes related to available-for-sale securities, tax
Reclassification of (gains)/losses to net income, tax	0	5
Unrealized gains/(losses) on cash flow hedges, tax
Reclassification of (gains)/losses to net income, tax	14	8
Net changes related to available-for-sale securities, net of tax
Reclassification of (gains)/losses to net income, net of tax	0	(8)
Unrealized gains/(losses) on cash flow hedges, net of tax
Reclassification of (gains)/losses to net income, net of tax	(23)	(12)
Interest expense
Unrealized gains/(losses) on cash flow hedges, before tax
Reclassification of (gains)/losses to net income, before tax	0	2
Unrealized gains/(losses) on cash flow hedges, tax
Reclassification of (gains)/losses to net income, tax		(1)
Unrealized gains/(losses) on cash flow hedges, net of tax
Reclassification of (gains)/losses to net income, net of tax	$ 0	$ 1

[1] Amounts may not add due to rounding.