Equity Activity - Reclassifications and Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost of sales	$ 10,213		$ 9,844	$ 30,748	$ 30,405
SG&A expense	4,732		4,731	16,093	15,273
Other (income) and expense	(8)		(133)	281	(578)
Interest expense	158		117	473	340
Provision for/(benefit from) income taxes	409	$ (983)	659	(31)	1,943
Net (income) loss	(2,853)		(2,950)	(7,371)	(8,727)
Other comprehensive income/(loss), Before Tax Amount	632		(547)	1,656	616
Other comprehensive income/(loss), Tax (Expense)/Benefit	(192)		(176)	(213)	(895)
Other comprehensive income/(loss)	440		(724)	1,442	(280)
Accumulated Other Comprehensive Income/(Loss)
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Unrealized gains/(losses) arising during the period, Net of Tax Amount				117	(1,319)
Reclassification/amortization, Net of Tax Amount				1,326	1,039
Other comprehensive income/(loss), Before Tax Amount	632		(547)	1,656	616
Other comprehensive income/(loss), Tax (Expense)/Benefit	(192)		(176)	(213)	(895)
Other comprehensive income/(loss)	440		(724)	1,442	(280)
Foreign Currency Translation Adjustments
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Unrealized gains/(losses) arising during the period, Net of Tax Amount				303	(1,593)
Reclassification/amortization, Net of Tax Amount				0	0
Other comprehensive income/(loss), Before Tax Amount	(99)		(1,015)	(109)	(1,365)
Other comprehensive income/(loss), Tax (Expense)/Benefit	50		(28)	411	(227)
Other comprehensive income/(loss)	(49)		(1,043)	303	(1,593)
Net Unrealized Gains/(Losses) on Available-For-Sale Securities
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Unrealized gains/(losses) arising during the period, Before Tax Amount	(1)		(102)	(36)	(85)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0		39	14	33
Unrealized gains/(losses) arising during the period, Net of Tax Amount	(1)		(63)	(22)	(52)
Reclassification/amortization, Net of Tax Amount				22	0
Other comprehensive income/(loss), Before Tax Amount	(2)		(101)	0	(85)
Other comprehensive income/(loss), Tax (Expense)/Benefit	1		39	0	33
Other comprehensive income/(loss)	(1)		(62)	0	(52)
Net Unrealized Gains/(Losses) on Available-For-Sale Securities | Reclassifications
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other (income) and expense	(1)		0	36	0
Provision for/(benefit from) income taxes	0		0	(14)	0
Net (income) loss	(1)		0	22	0
Net Unrealized Gains/(Losses) on Cash Flow Hedges
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Unrealized gains/(losses) arising during the period, Before Tax Amount	35		36	(221)	467
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(14)		(9)	82	(166)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	21		27	(139)	301
Reclassification/amortization, Net of Tax Amount				12	(544)
Other comprehensive income/(loss), Before Tax Amount	50		(237)	(195)	(376)
Other comprehensive income/(loss), Tax (Expense)/Benefit	(22)		88	68	132
Other comprehensive income/(loss)	29		(149)	(127)	(243)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost of sales	4		(46)	14	(154)
SG&A expense	(2)		(43)	1	(124)
Other (income) and expense	6		(185)	(6)	(565)
Interest expense	7		0	17	0
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Cost of sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	(2)		13	(7)	46
Net (income) loss	2		(33)	7	(109)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | SG&A expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	(1)		13	(3)	36
Net (income) loss	(3)		(30)	(1)	(88)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Other (income) and expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	(2)		71	2	217
Net (income) loss	4		(114)	(4)	(348)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Interest expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	(3)		0	(6)	0
Net (income) loss	4		0	10	0
Net Change Retirement-Related Benefit Plans
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Unrealized gains/(losses) arising during the period, Net of Tax Amount				(25)	25
Reclassification/amortization, Net of Tax Amount				1,292	1,583
Other comprehensive income/(loss), Before Tax Amount	683		807	1,960	2,441
Other comprehensive income/(loss), Tax (Expense)/Benefit	(222)		(275)	(693)	(833)
Other comprehensive income/(loss)	461		531	1,267	1,608
Retirement-Related Benefit Plans, Prior Service Costs/(Credits)
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Unrealized gains/(losses) arising during the period, Before Tax Amount			0		6
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit			0		(2)
Unrealized gains/(losses) arising during the period, Net of Tax Amount			0		4
Reclassification/amortization, Before Tax Amount	(28)		(25)	(81)	(76)
Reclassification/amortization, Tax (Expense)/Benefit	9		8	29	26
Reclassification/amortization, Net of Tax Amount	(19)		(16)	(52)	(50)
Retirement-Related Benefit Plans, Net Gains/(Losses)
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Unrealized gains/(losses) arising during the period, Before Tax Amount	11		(2)	(57)	14
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(5)		1	20	(5)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	6		(1)	(37)	9
Reclassification/amortization, Before Tax Amount	696		823	2,079	2,479
Reclassification/amortization, Tax (Expense)/Benefit	(225)		(281)	(735)	(846)
Reclassification/amortization, Net of Tax Amount	471		542	1,344	1,633
Retirement-Related Benefit Plans, Curtailments and Settlements
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Unrealized gains/(losses) arising during the period, Before Tax Amount	4		11	19	19
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(1)		(4)	(7)	(6)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	$ 3		$ 7	$ 12	$ 12