Equity Activity - Reclassifications and Taxes (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021		Sep. 30, 2022		Sep. 30, 2021
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	$ 6,677		$ 6,145	[1]	$ 20,784		$ 18,670	[1]
SG&A expense	4,391		4,306	[1]	13,843		13,842	[1]
Other (income) and expense	5,755		244	[1]	5,921		891	[1]
Interest expense	295		290	[1]	903		852	[1]
Provision for/(benefit from) income taxes	(1,287)		(224)	[1]	(1,070)		(282)	[1]
Net (income) loss	3,196	[2]	(1,130)	[1],[3]	1,071	[2]	(3,410)	[1],[3]
Other comprehensive income/(loss)	5,030		350		6,096		2,035
Pre-tax pension settlement charge	5,900				5,894
Pension settlement charge, net of tax	4,400
Services.
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,168		4,650	[1]	15,915		14,014	[1]
Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,389		1,363	[1],[4]	4,555		4,241	[1],[4]
Financing.
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	120		132	[1],[4]	314		416	[1],[4]
Cost of services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,168		4,650		15,915		14,014
Cost of sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,389		1,363		4,555		4,241
Cost of financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	120		132		314		416
SG&A expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
SG&A expense	4,391		4,306		13,843		13,842
Other (income) and expenses
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other (income) and expense	5,755		244		5,921		891
Interest expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Interest expense	295		290		903		852
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					697		382
Reclassification/amortization, Net of Tax Amount					5,399		1,654
Other comprehensive income/(loss), Before Tax Amount	7,089		683		8,973		3,014
Other comprehensive income/(loss), Tax (Expense)/Benefit	(2,058)		(333)		(2,877)		(978)
Other comprehensive income/(loss)	5,030		350		6,096		2,035
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					14		160
Other comprehensive income/(loss), Before Tax Amount	143		(114)		799		463
Other comprehensive income/(loss), Tax (Expense)/Benefit	(301)		(120)		(784)		(304)
Other comprehensive income/(loss)	(158)		(234)		14		160
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	0		0		(1)		0
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0		0		0		0
Unrealized gains/(losses) arising during the period, Net of Tax Amount	0		0		(1)		0
Other comprehensive income/(loss), Before Tax Amount	0		0		(1)		0
Other comprehensive income/(loss), Tax (Expense)/Benefit	0		0		0		0
Other comprehensive income/(loss)	0		0		(1)		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	189		109		449		262
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(49)		(28)		(118)		(66)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	140		82		332		196
Reclassification/amortization, Net of Tax Amount					6		211
Other comprehensive income/(loss), Before Tax Amount	178		141		453		545
Other comprehensive income/(loss), Tax (Expense)/Benefit	(45)		(35)		(116)		(138)
Other comprehensive income/(loss)	133		106		338		407
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications
Reclassifications and Taxes Related to Items of Other Comprehensive Income
SG&A expense	(8)		1		(28)		32
Other (income) and expense	6		22		51		187
Interest expense	22		16		64		48
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Services.
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	(4)		(12)		(32)		(33)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	(35)		(1)		(71)		30
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Financing.
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	7		6		19		17
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Cost of services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	1		3		8		8
Net (income) loss	(3)		(9)		(24)		(25)
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	10		1		20		(8)
Net (income) loss	(25)		(1)		(50)		23
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Cost of financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	(2)		(1)		(5)		(4)
Net (income) loss	5		4		14		13
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	2		0		8		(8)
Net (income) loss	(6)		1		(20)		24
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Other (income) and expenses
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	(2)		(6)		(13)		(47)
Net (income) loss	5		17		38		140
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	(5)		(4)		(16)		(12)
Net (income) loss	16		12		48		36
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					352		26
Reclassification/amortization, Net of Tax Amount					5,393		1,442
Other comprehensive income/(loss), Before Tax Amount	6,768		656		7,722		2,006
Other comprehensive income/(loss), Tax (Expense)/Benefit	(1,712)		(178)		(1,978)		(537)
Other comprehensive income/(loss)	5,056		478		5,745		1,469
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	412		0		408		0
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(104)		0		(99)		0
Unrealized gains/(losses) arising during the period, Net of Tax Amount	309		0		309		0
Reclassification/amortization, Before Tax Amount	3		3		16		8
Reclassification/amortization, Tax (Expense)/Benefit	(1)		0		(4)		0
Reclassification/amortization, Net of Tax Amount	2		3		12		8
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	53		1		63		23
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(13)		0		(20)		4
Unrealized gains/(losses) arising during the period, Net of Tax Amount	39		1		43		27
Reclassification/amortization, Before Tax Amount	388		638		1,305		1,929
Reclassification/amortization, Tax (Expense)/Benefit	(108)		(174)		(364)		(526)
Reclassification/amortization, Net of Tax Amount	279		464		941		1,403
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	5,913		13		5,931		46
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(1,487)		(4)		(1,491)		(14)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	$ 4,426		$ 9		$ 4,440		$ 32

[1] Reclassified to reflect discontinued operations presentation.

[2] Includes the impact of a one-time, non-cash pension settlement charge. Refer to note 18, "Retirement-Related Benefits," for additional information.

[3] Amounts presented have not been recast to exclude discontinued operations.

[4] Reclassified to conform to current year presentation.