Equity Activity - Reclassifications and Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	$ 6,510	$ 6,719
SG&A expense	4,886	4,974
Other (income) and expense	(165)	(317)
Interest expense	455	432
Services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,002	5,239
Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,404	1,381
Financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	104	99
Accumulated Other Comprehensive Income/(Loss)
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	(566)	563
Other comprehensive income/(loss), Tax (Expense)/Benefit	259	(289)
Other comprehensive income/(loss)	(306)	273
Unrealized gains/(losses) arising during the period, Net of Tax Amount	(176)	30
Reclassification/amortization, Net of Tax Amount	(130)	243
Foreign currency translation adjustments
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	(343)	55
Other comprehensive income/(loss), Tax (Expense)/Benefit	203	(154)
Other comprehensive income/(loss)	(139)	(99)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	(139)	(99)
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	8	0
Other comprehensive income/(loss), Tax (Expense)/Benefit	(2)	0
Other comprehensive income/(loss)	6	0
Unrealized gains/(losses) arising during the period, Before Tax Amount	8	0
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(2)	0
Unrealized gains/(losses) arising during the period, Net of Tax Amount	6	0
Net Unrealized Gains/(Losses) on Cash Flow Hedges
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	(382)	246
Other comprehensive income/(loss), Tax (Expense)/Benefit	98	(63)
Other comprehensive income/(loss)	(283)	183
Unrealized gains/(losses) arising during the period, Before Tax Amount	(58)	176
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	16	(47)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	(42)	129
Reclassification/amortization, Net of Tax Amount	(241)	54
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	0	1
Reclassification/amortization, Net of Tax Amount	2	(3)
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	2	4
Reclassification/amortization, Net of Tax Amount	(5)	(8)
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
Reclassification/amortization, Net of Tax Amount	1	1
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	1	1
Reclassification/amortization, Net of Tax Amount	(2)	(2)
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	81	(20)
Reclassification/amortization, Net of Tax Amount	(241)	59
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	(2)	(2)
Reclassification/amortization, Net of Tax Amount	5	6
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	(3)	(3)
Other (income) and expense	(322)	79
Interest expense	6	9
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	2	(4)
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	(8)	(12)
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
Retirement-related benefit plans
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	151	262
Other comprehensive income/(loss), Tax (Expense)/Benefit	(40)	(72)
Other comprehensive income/(loss)	111	189
Unrealized gains/(losses) arising during the period, Net of Tax Amount	0	0
Reclassification/amortization, Net of Tax Amount	111	189
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)
Reclassification/amortization, Tax (Expense)/Benefit	1	0
Reclassification/amortization, Net of Tax Amount	(1)	(1)
Net (losses)/gains 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	1
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	151	261
Reclassification/amortization, Tax (Expense)/Benefit	(41)	(72)
Reclassification/amortization, Net of Tax Amount	111	189
Curtailments and settlements
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Before Tax Amount	2	2
Reclassification/amortization, Tax (Expense)/Benefit	0	0
Reclassification/amortization, Net of Tax Amount	$ 2	$ 2