Equity Activity: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other comprehensive income/(loss), before tax
Foreign currency translation adjustments, before tax	$ 382	$ 501	$ (959)	$ 164
Net changes related to available-for-sale securities, before tax
Unrealized gains/(losses) arising during the period, before tax	3	11	0	13
Reclassification of (gains)/losses to other (income) and expense, before tax	(5)	(27)	(5)	(43)
Subsequent changes in previously impaired securities arising during the period, before tax	1	(7)	3	20
Total net changes related to available-for-sale securities	(1)	(24)	(1)	(10)
Unrealized gains/(losses) on cash flow hedges, before tax
Unrealized gains/(losses) arising during the period, before tax	(409)	(54)	(58)	65
Reclassification of (gains)/losses to net income, before tax	(27)	(112)	(130)	(246)
Total unrealized gains/(losses) on cash flow hedges	(436)	(165)	(188)	(181)
Retirement-related benefit plans, before tax
Prior service costs/(credits), before tax	0	0	33	0
Net (losses)/gains arising during the period, before tax	105	1	300	66
Curtailments and settlements, before tax	0	(2)	0	(1)
Amortization of prior service (credits)/costs, before tax	(28)	(37)	(86)	(112)
Amortization of net (gains)/losses, before tax	872	613	2,623	1,846
Total retirement-related benefit plans	949	575	2,869	1,799
Other comprehensive income/(loss), before tax	895	887	1,721	1,771
Other comprehensive income/(loss), tax
Foreign currency translation adjustments, tax	86	56	(21)	9
Net changes related to available-for-sale securities, tax
Unrealized gains/(losses) arising during the period, tax	(1)	(4)	(1)	(5)
Reclassification of (gains)/losses to other (income) and expense, tax	2	11	2	17
Subsequent changes in previously impaired securities arising during the period, tax	0	3	(1)	(8)
Total net changes related to available-for-sale securities, tax	0	9	0	4
Unrealized gains/(losses) on cash flow hedges, tax
Unrealized gains/(losses) arising during the period, tax	144	10	25	(35)
Total unrealized gains/(losses) on cash flow hedges, tax	153	50	74	48
Retirement-related benefit plans, tax
Prior service costs/(credits), tax	0	0	(11)	0
Net (losses)/gains arising during the period, tax	(36)	(1)	(103)	(24)
Curtailments and settlements, tax	0	1	0	1
Amortization of prior service (credits)/costs, tax	10	15	30	41
Amortization of net (gains)/losses, tax	(304)	(238)	(901)	(684)
Total retirement-related benefit plans, tax	(331)	(224)	(986)	(667)
Other comprehensive income/(loss), tax	(91)	(109)	(933)	(606)
Other comprehensive income/(loss), net of tax
Foreign currency translation adjustments, net of tax	468	557	(980)	172
Net changes related to available-for-sale securities, net of tax
Unrealized gains/(losses) arising during the period, net of tax	1	6	0	8
Reclassification of (gains)/losses to other (income) and expense, net of tax	(3)	(17)	(3)	(26)
Subsequent changes in previously impaired securities arising during the period, net of tax	1	(4)	2	12
Total net changes related to available-for-sale securities, net of tax	(1)	(15)	(1)	(6)
Unrealized gains/(losses) on cash flow hedges, net of tax
Unrealized gains/(losses) arising during the period, net of tax	(265)	(43)	(33)	31
Total unrealized gains/(losses) on cash flow hedges, net of tax	(282)	(116)	(114)	(133)
Retirement-related benefit plans, net of tax
Prior service costs/(credits), net of tax	0	0	21	0
Net (losses)/gains arising during the period, net of tax	68	0	197	41
Curtailments and settlements, net of tax	0	(1)	0	(1)
Amortization of prior service (credits)/costs, net of tax	(18)	(23)	(57)	(70)
Amortization of net (gains)/losses, net of tax	568	375	1,721	1,161
Total retirement-related benefit plans, net of tax	618	351	1,883	1,132
Other comprehensive income/(loss)	804	778	788	1,165
Cost of sales
Unrealized gains/(losses) on cash flow hedges, before tax
Reclassification of (gains)/losses to net income, before tax	17	(6)	15	(22)
Unrealized gains/(losses) on cash flow hedges, tax
Reclassification of (gains)/losses to net income, tax	(7)	(1)	(6)	(1)
Unrealized gains/(losses) on cash flow hedges, net of tax
Reclassification of (gains)/losses to net income, net of tax	10	(7)	9	(23)
SG&A expense
Unrealized gains/(losses) on cash flow hedges, before tax
Reclassification of (gains)/losses to net income, before tax	(13)	(5)	(29)	(21)
Unrealized gains/(losses) on cash flow hedges, tax
Reclassification of (gains)/losses to net income, tax	5	1	10	5
Unrealized gains/(losses) on cash flow hedges, net of tax
Reclassification of (gains)/losses to net income, net of tax	(9)	(4)	(18)	(16)
Other (income) and expense
Net changes related to available-for-sale securities, before tax
Reclassification of (gains)/losses to other (income) and expense, before tax	(5)	(27)	(5)	(43)
Unrealized gains/(losses) on cash flow hedges, before tax
Reclassification of (gains)/losses to net income, before tax	(30)	(103)	(115)	(209)
Net changes related to available-for-sale securities, tax
Reclassification of (gains)/losses to other (income) and expense, tax	2	11	2	17
Unrealized gains/(losses) on cash flow hedges, tax
Reclassification of (gains)/losses to net income, tax	12	40	45	81
Net changes related to available-for-sale securities, net of tax
Reclassification of (gains)/losses to other (income) and expense, net of tax	(3)	(17)	(3)	(26)
Unrealized gains/(losses) on cash flow hedges, net of tax
Reclassification of (gains)/losses to net income, net of tax	(19)	(63)	(71)	(128)
Interest expense
Unrealized gains/(losses) on cash flow hedges, before tax
Reclassification of (gains)/losses to net income, before tax	0	2	0	6
Unrealized gains/(losses) on cash flow hedges, tax
Reclassification of (gains)/losses to net income, tax	0	(1)	0	(2)
Unrealized gains/(losses) on cash flow hedges, net of tax
Reclassification of (gains)/losses to net income, net of tax	$ 0	$ 1	$ 0	$ 4