Equity Activity - Reclassifications and Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	$ 6,743	$ 6,862
SG&A expense	4,853	4,597
Other (income) and expense	(245)	246
Interest expense	367	311
Provision for/(benefit from) income taxes	124	(39)
Net (income) loss	(927)	(733)
Other comprehensive income/(loss)	(40)	703
Services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,310	5,349
Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,322	1,415
Financing.
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	110	98
Cost of services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,310	5,349
Cost of sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,322	1,415
Cost of financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	110	98
SG&A expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
SG&A expense	4,853	4,597
Other (income) and expenses
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other (income) and expense	(245)	246
Interest expense.
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Interest expense	367	311
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	(39)	355
Reclassification/amortization, Net of Tax Amount	0	348
Other comprehensive income/(loss), Before Tax Amount	(93)	987
Other comprehensive income/(loss), Tax (Expense)/Benefit	53	(285)
Other comprehensive income/(loss)	(40)	703
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	(30)	306
Other comprehensive income/(loss), Before Tax Amount	(87)	442
Other comprehensive income/(loss), Tax (Expense)/Benefit	56	(136)
Other comprehensive income/(loss)	(30)	306
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	15	0
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(4)	0
Unrealized gains/(losses) arising during the period, Net of Tax Amount	11	0
Other comprehensive income/(loss), Before Tax Amount	15	0
Other comprehensive income/(loss), Tax (Expense)/Benefit	(4)	0
Other comprehensive income/(loss)	11	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	(29)	60
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	6	(16)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	(23)	44
Reclassification/amortization, Net of Tax Amount	(90)	0
Other comprehensive income/(loss), Before Tax Amount	(151)	59
Other comprehensive income/(loss), Tax (Expense)/Benefit	38	(15)
Other comprehensive income/(loss)	(113)	44
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications
Reclassifications and Taxes Related to Items of Other Comprehensive Income
SG&A expense	(10)	(6)
Other (income) and expense	(126)	7
Interest expense	21	21
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	2	(15)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	(14)	(12)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Financing.
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5	5
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	0	4
Net (income) loss	2	(11)
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	4	4
Net (income) loss	(10)	(9)
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	(1)	(1)
Net (income) loss	4	4
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	3	2
Net (income) loss	(7)	(4)
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	32	(2)
Net (income) loss	(94)	5
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)	(5)
Net (income) loss	16	15
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	2	5
Reclassification/amortization, Net of Tax Amount	90	348
Other comprehensive income/(loss), Before Tax Amount	130	486
Other comprehensive income/(loss), Tax (Expense)/Benefit	(38)	(134)
Other comprehensive income/(loss)	92	352
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		(5)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	1	5
Unrealized gains/(losses) arising during the period, Net of Tax Amount	1	0
Reclassification/amortization, Before Tax Amount	(2)	7
Reclassification/amortization, Tax (Expense)/Benefit	1	(2)
Reclassification/amortization, Net of Tax Amount	(2)	5
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	2	9
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0	(4)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	2	5
Reclassification/amortization, Before Tax Amount	131	468
Reclassification/amortization, Tax (Expense)/Benefit	(38)	(131)
Reclassification/amortization, Net of Tax Amount	93	337
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	(1)	8
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0	(2)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	$ (1)	$ 6