Equity Activity - Reclassifications and Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022		Sep. 30, 2023	Sep. 30, 2022
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	$ 6,729	$ 6,677		$ 20,446	$ 20,784
SG&A expense	4,458	4,391		14,212	13,843
Other (income) and expense	(215)	5,755		(721)	5,921
Interest expense	412	295		1,202	903
Provision for/(benefit from) income taxes	159	(1,287)		702	(1,070)
Net (income) loss	(1,704)	3,196	[1]	(4,214)	1,071	[1],[2]
Pension settlement charge		5,900		0	5,894	[2]
Pension settlement charge, net of tax		4,400
Services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,217	5,168		15,821	15,915
Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,419	1,389		4,329	4,555
Financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	94	120		297	314
Cost of services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,217	5,168		15,821	15,915
Cost of sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,419	1,389		4,329	4,555
Cost of financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	94	120		297	314
SG&A expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
SG&A expense	4,458	4,391		14,212	13,843
Other (income) and expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other (income) and expense	(215)	5,755		(721)	5,921
Interest expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Interest expense	412	295		1,202	903
Accumulated Other Comprehensive Income/(Loss)
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	714	7,089		1,003	8,973
Other comprehensive income/(loss), Tax (Expense)/Benefit	(313)	(2,058)		(361)	(2,877)
Other comprehensive income/(loss)	402	5,030		642	6,096
Unrealized gains/(losses) arising during the period, Net of Tax Amount				326	697
Reclassification/amortization, Net of Tax Amount				316	5,399
Accumulated Foreign Currency Adjustment Attributable to Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	151	143		180	799
Other comprehensive income/(loss), Tax (Expense)/Benefit	(164)	(301)		(142)	(784)
Other comprehensive income/(loss)	(13)	(158)		39	14
Unrealized gains/(losses) arising during the period, Net of Tax Amount				39	14
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	0	0		(1)	(1)
Other comprehensive income/(loss), Tax (Expense)/Benefit	0	0		0	0
Other comprehensive income/(loss)	0	0		(1)	(1)
Unrealized gains/(losses) arising during the period, Before Tax Amount	0	0		(1)	(1)
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)	(1)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	333	178		330	453
Other comprehensive income/(loss), Tax (Expense)/Benefit	(85)	(45)		(87)	(116)
Other comprehensive income/(loss)	248	133		243	338
Unrealized gains/(losses) arising during the period, Before Tax Amount	131	189		279	449
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(35)	(49)		(77)	(118)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	95	140		203	332
Reclassification/amortization, Net of Tax Amount				40	6
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income
Reclassifications and Taxes Related to Items of Other Comprehensive Income
SG&A expense	4	(8)		(7)	(28)
Other (income) and expense	175	6		(6)	51
Interest expense	14	22		57	64
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income | Services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	2	(4)		6	(32)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income | Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5	(35)		(12)	(71)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income | Financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	3	7		12	19
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income | Cost of services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	0	1		(1)	8
Net (income) loss	1	(3)		5	(24)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income | Cost of sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	(1)	10		4	20
Net (income) loss	4	(25)		(8)	(50)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income | Cost of financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	(1)	(2)		(3)	(5)
Net (income) loss	2	5		9	14
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income | SG&A expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	(1)	2		2	8
Net (income) loss	3	(6)		(4)	(20)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income | Other (income) and expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	(44)	(2)		1	(13)
Net (income) loss	131	5		(4)	38
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income | Interest expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Provision for/(benefit from) income taxes	(4)	(5)		(14)	(16)
Net (income) loss	11	16		43	48
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	230	6,768		494	7,722
Other comprehensive income/(loss), Tax (Expense)/Benefit	(63)	(1,712)		(132)	(1,978)
Other comprehensive income/(loss)	167	5,056		361	5,745
Unrealized gains/(losses) arising during the period, Net of Tax Amount				86	352
Reclassification/amortization, Net of Tax Amount				276	5,393
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Unrealized gains/(losses) arising during the period, Before Tax Amount	0	412		0	408
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0	(104)		1	(99)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	0	309		1	309
Reclassification/amortization, Before Tax Amount	(2)	3		(6)	16
Reclassification/amortization, Tax (Expense)/Benefit	1	(1)		2	(4)
Reclassification/amortization, Net of Tax Amount	(2)	2		(5)	12
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Unrealized gains/(losses) arising during the period, Before Tax Amount	102	53		104	63
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(26)	(13)		(19)	(20)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	77	39		85	43
Reclassification/amortization, Before Tax Amount	128	388		389	1,305
Reclassification/amortization, Tax (Expense)/Benefit	(37)	(108)		(113)	(364)
Reclassification/amortization, Net of Tax Amount	91	279		276	941
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	2	5,913		7	5,931
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(1)	(1,487)		(2)	(1,491)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	$ 1	$ 4,426		$ 5	$ 4,440

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

[2] ncludes immaterial cash flows from discontinued operations.