Equity Activity - Reclassifications and Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	$ 6,970	$ 6,548	$ 20,481	$ 20,087
SG&A expense	4,748	4,911	14,661	14,823
Other (income) and expense	(173)	2,244	(376)	1,694
Interest expense	492	429	1,457	1,288
Pension settlement charge		2,700	0	2,725
Pension settlement charge, net of tax		2,000
Services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,224	5,048	15,506	15,414
Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,637	1,404	4,672	4,393
Financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	109	95	303	281
Accumulated Other Comprehensive Income/(Loss)
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	170	2,293	(1,355)	3,178
Other comprehensive income/(loss), Tax (Expense)/Benefit	(112)	(392)	641	(835)
Other comprehensive income/(loss)	58	1,900	(715)	2,343
Unrealized gains/(losses) arising during the period, Net of Tax Amount			(572)	(100)
Reclassification/amortization, Net of Tax Amount			(142)	2,443
Foreign currency translation adjustments
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	(100)	(330)	(1,056)	(273)
Other comprehensive income/(loss), Tax (Expense)/Benefit	(40)	270	562	49
Other comprehensive income/(loss)	(140)	(60)	(494)	(224)
Unrealized gains/(losses) arising during the period, Net of Tax Amount			(494)	(224)
Net Unrealized Gains/(Losses) on Available- For-Sale Securities
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	(2)	0	1	1
Other comprehensive income/(loss), Tax (Expense)/Benefit	0	0	0	0
Other comprehensive income/(loss)	(1)	0	0	1
Unrealized gains/(losses) arising during the period, Before Tax Amount	(2)	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	(1)	0	0	1
Net Unrealized Gains/(Losses) on Cash Flow Hedges
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	113	(449)	(769)	(142)
Other comprehensive income/(loss), Tax (Expense)/Benefit	(30)	116	197	37
Other comprehensive income/(loss)	84	(333)	(572)	(105)
Unrealized gains/(losses) arising during the period, Before Tax Amount	20	(215)	(121)	64
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(6)	57	34	(18)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	14	(158)	(87)	46
Reclassification/amortization, Net of Tax Amount			(485)	(151)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Cost of services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	(2)	1	(3)	5
Reclassification/amortization, Net of Tax Amount	5	(4)	9	(14)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Cost of sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	0	1	1	10
Reclassification/amortization, Net of Tax Amount	0	(2)	(1)	(20)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Cost of financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	0	0	(1)	(1)
Reclassification/amortization, Net of Tax Amount	1	1	2	4
Net Unrealized Gains/(Losses) on Cash Flow Hedges | SG&A expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	0	0	0	3
Reclassification/amortization, Net of Tax Amount	1	0	(1)	(7)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Other (income) and expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	(20)	59	171	44
Reclassification/amortization, Net of Tax Amount	59	(175)	(508)	(132)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Interest expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	(1)	(2)	(5)	(6)
Reclassification/amortization, Net of Tax Amount	4	6	13	18
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Reclassifications and Taxes Related to Items of Other Comprehensive Income
SG&A expense	1	0	(1)	(10)
Other (income) and expense	79	(234)	(679)	(176)
Interest expense	6	8	18	24
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income | Services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	7	(5)	12	(19)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income | Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	0	(3)	(2)	(30)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income | Financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1	2	3	5
Retirement-related benefit plans
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	158	3,072	469	3,592
Other comprehensive income/(loss), Tax (Expense)/Benefit	(43)	(779)	(118)	(921)
Other comprehensive income/(loss)	115	2,293	351	2,672
Unrealized gains/(losses) arising during the period, Net of Tax Amount			8	78
Reclassification/amortization, Net of Tax Amount			343	2,594
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		0
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0		0
Unrealized gains/(losses) arising during the period, Net of Tax Amount	0		0
Reclassification/amortization, Before Tax Amount	(2)	(2)	(5)	(5)
Reclassification/amortization, Tax (Expense)/Benefit	1	0	2	1
Reclassification/amortization, Net of Tax Amount	(1)	(1)	(3)	(4)
Net gains/(losses) arising during the period
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Unrealized gains/(losses) arising during the period, Before Tax Amount	0	100	0	101
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0	(25)	8	(23)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	0	75	8	78
Reclassification/amortization, Before Tax Amount	158	246	466	765
Reclassification/amortization, Tax (Expense)/Benefit	(43)	(68)	(126)	(212)
Reclassification/amortization, Net of Tax Amount	115	178	341	554
Curtailments and settlements
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Before Tax Amount	2	2,727	8	2,731
Reclassification/amortization, Tax (Expense)/Benefit	0	(686)	(2)	(687)
Reclassification/amortization, Net of Tax Amount	$ 1	$ 2,041	$ 6	$ 2,044