Equity Activity - Reclassifications and Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	$ 6,719	$ 6,743
SG&A expense	4,974	4,853
Other (income) and expense	(317)	(245)
Interest expense	432	367
Services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,239	5,310
Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,381	1,322
Financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	99	110
Accumulated Other Comprehensive Income/(Loss)
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	563	(93)
Other comprehensive income/(loss), Tax (Expense)/Benefit	(289)	53
Other comprehensive income/(loss)	273	(40)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	30	(39)
Reclassification/amortization, Net of Tax Amount	243	0
Accumulated Foreign Currency Adjustment Attributable to Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	55	(87)
Other comprehensive income/(loss), Tax (Expense)/Benefit	(154)	56
Other comprehensive income/(loss)	(99)	(30)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	(99)	(30)
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	15
Other comprehensive income/(loss), Tax (Expense)/Benefit	0	(4)
Other comprehensive income/(loss)	0	11
Unrealized gains/(losses) arising during the period, Before Tax Amount	0	15
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0	(4)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	0	11
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	246	(151)
Other comprehensive income/(loss), Tax (Expense)/Benefit	(63)	38
Other comprehensive income/(loss)	183	(113)
Unrealized gains/(losses) arising during the period, Before Tax Amount	176	(29)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(47)	6
Unrealized gains/(losses) arising during the period, Net of Tax Amount	129	(23)
Reclassification/amortization, Net of Tax Amount	54	(90)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Cost of services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	1	0
Reclassification/amortization, Net of Tax Amount	(3)	2
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Cost of sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	4	4
Reclassification/amortization, Net of Tax Amount	(8)	(10)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Cost of financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	0	(1)
Reclassification/amortization, Net of Tax Amount	1	4
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | SG&A expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	1	3
Reclassification/amortization, Net of Tax Amount	(2)	(7)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Other (income) and expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	(20)	32
Reclassification/amortization, Net of Tax Amount	59	(94)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Tax (Expense)/Benefit	(2)	(5)
Reclassification/amortization, Net of Tax Amount	6	16
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	(3)	(10)
Other (income) and expense	79	(126)
Interest expense	9	21
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	(4)	2
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	(12)	(14)
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	2	5
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	262	130
Other comprehensive income/(loss), Tax (Expense)/Benefit	(72)	(38)
Other comprehensive income/(loss)	189	92
Unrealized gains/(losses) arising during the period, Net of Tax Amount	0	2
Reclassification/amortization, Net of Tax Amount	189	90
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	0
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0	1
Unrealized gains/(losses) arising during the period, Net of Tax Amount	0	1
Reclassification/amortization, Before Tax Amount	(2)	(2)
Reclassification/amortization, Tax (Expense)/Benefit	0	1
Reclassification/amortization, Net of Tax Amount	(1)	(2)
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	1	2
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0	0
Unrealized gains/(losses) arising during the period, Net of Tax Amount	0	2
Reclassification/amortization, Before Tax Amount	261	131
Reclassification/amortization, Tax (Expense)/Benefit	(72)	(38)
Reclassification/amortization, Net of Tax Amount	189	93
Retirement-Related Benefit Plans, Curtailments and Settlements
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Before Tax Amount	2	(1)
Reclassification/amortization, Tax (Expense)/Benefit	0	0
Reclassification/amortization, Net of Tax Amount	$ 2	$ (1)