Equity Activity - Reclassifications and Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	$ 6,974	$ 7,246	$ 13,717	$ 14,107
SG&A expense	4,900	4,855	9,754	9,452
Other (income) and expense	(261)	(81)	(506)	166
Interest expense	423	297	790	607
Provision for income taxes	419	257	543	218
Net (income) loss	(1,583)	(1,392)	(2,511)	(2,125)	[1]
Services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,294	5,399	10,604	10,747
Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,587	1,750	2,910	3,165
Financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	93	96	203	194
Cost of services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,294	5,399	10,604	10,747
Cost of sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,587	1,750	2,910	3,165
Cost of financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	93	96	203	194
SG&A expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
SG&A expense	4,900	4,855	9,754	9,452
Other (income) and expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other (income) and expense	(261)	(81)	(506)	166
Interest expense
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Interest expense	423	297	790	607
Accumulated Other Comprehensive Income/(Loss)
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	381	897	289	1,885
Other comprehensive income/(loss), Tax (Expense)/Benefit	(101)	(534)	(48)	(819)
Other comprehensive income/(loss)	280	363	241	1,066
Unrealized gains/(losses) arising during the period, Net of Tax Amount			167	366
Reclassification/amortization, Net of Tax Amount			74	699
Accumulated Foreign Currency Adjustment Attributable to Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	116	213	29	655
Other comprehensive income/(loss), Tax (Expense)/Benefit	(34)	(347)	22	(483)
Other comprehensive income/(loss)	82	(134)	52	172
Unrealized gains/(losses) arising during the period, Net of Tax Amount			52	172
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	(17)	0	(1)	(1)
Other comprehensive income/(loss), Tax (Expense)/Benefit	4	0	0	0
Other comprehensive income/(loss)	(12)	0	(1)	0
Unrealized gains/(losses) arising during the period, Before Tax Amount	(17)	0	(1)	(1)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	4	0	0	0
Unrealized gains/(losses) arising during the period, Net of Tax Amount	(12)	0	(1)	0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	148	217	(3)	276
Other comprehensive income/(loss), Tax (Expense)/Benefit	(40)	(56)	(1)	(71)
Other comprehensive income/(loss)	109	161	(4)	205
Unrealized gains/(losses) arising during the period, Before Tax Amount	178	200	149	260
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(48)	(53)	(41)	(69)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	130	147	107	191
Reclassification/amortization, Net of Tax Amount			(112)	14
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	(1)	(14)	(10)	(20)
Other (income) and expense	(55)	38	(181)	45
Interest expense	22	22	42	43
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	3	(13)	5	(28)
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	(2)	(23)	(17)	(35)
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	4	6	9	12
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 income taxes	(1)	3	(1)	7
Net (income) loss	2	(10)	4	(21)
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 income taxes	1	7	5	10
Net (income) loss	(1)	(17)	(12)	(25)
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 income taxes	(1)	(2)	(2)	(3)
Net (income) loss	3	5	7	9
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 income taxes	0	4	3	5
Net (income) loss	0	(10)	(7)	(14)
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 income taxes	14	(10)	45	(11)
Net (income) loss	(41)	29	(135)	34
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 income taxes	(5)	(6)	(11)	(11)
Net (income) loss	16	16	32	32
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	134	468	263	954
Other comprehensive income/(loss), Tax (Expense)/Benefit	(31)	(132)	(69)	(266)
Other comprehensive income/(loss)	102	336	194	689
Unrealized gains/(losses) arising during the period, Net of Tax Amount			9	3
Reclassification/amortization, Net of Tax Amount			185	686
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	0	(5)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0	0	1	5
Unrealized gains/(losses) arising during the period, Net of Tax Amount	0	0	1	0
Reclassification/amortization, Before Tax Amount	(2)	6	(4)	13
Reclassification/amortization, Tax (Expense)/Benefit	1	(2)	1	(3)
Reclassification/amortization, Net of Tax Amount	(2)	5	(3)	10
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	0	1	2	10
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	7	(3)	7	(7)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	7	(2)	8	3
Reclassification/amortization, Before Tax Amount	130	450	261	917
Reclassification/amortization, Tax (Expense)/Benefit	(38)	(125)	(76)	(256)
Reclassification/amortization, Net of Tax Amount	92	325	185	662
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	6	11	5	19
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(1)	(3)	(1)	(5)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	$ 5	$ 8	$ 4	$ 14

[1] Includes immaterial cash flows from discontinued operations.