Equity Activity - Reclassifications and Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	$ 6,548	$ 6,729	$ 20,087	$ 20,446
SG&A expense	4,911	4,458	14,823	14,212
Other (income) and expense	2,244	(215)	1,694	(721)
Interest expense	429	412	1,288	1,202
Pension settlement charge	2,700		2,725	0
Pension settlement charge, net of tax	2,000
Services
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	5,048	5,217	15,414	15,821
Sales
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	1,404	1,419	4,393	4,329
Financing
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Cost	95	94	281	297
Accumulated Other Comprehensive Income/(Loss)
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	2,293	714	3,178	1,003
Other comprehensive income/(loss), Tax (Expense)/Benefit	(392)	(313)	(835)	(361)
Other comprehensive income/(loss)	1,900	402	2,343	642
Unrealized gains/(losses) arising during the period, Net of Tax Amount			(100)	326
Reclassification/amortization, Net of Tax Amount			2,443	316
Accumulated Foreign Currency Adjustment Attributable to Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	(330)	151	(273)	180
Other comprehensive income/(loss), Tax (Expense)/Benefit	270	(164)	49	(142)
Other comprehensive income/(loss)	(60)	(13)	(224)	39
Unrealized gains/(losses) arising during the period, Net of Tax Amount			(224)	39
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	0	1	(1)
Other comprehensive income/(loss), Tax (Expense)/Benefit	0	0	0	0
Other comprehensive income/(loss)	0	0	1	(1)
Unrealized gains/(losses) arising during the period, Before Tax Amount	0	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	0	0	1	(1)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	(449)	333	(142)	330
Other comprehensive income/(loss), Tax (Expense)/Benefit	116	(85)	37	(87)
Other comprehensive income/(loss)	(333)	248	(105)	243
Unrealized gains/(losses) arising during the period, Before Tax Amount	(215)	131	64	279
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	57	(35)	(18)	(77)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	(158)	95	46	203
Reclassification/amortization, Net of Tax Amount			(151)	40
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	5	(1)
Reclassification/amortization, Net of Tax Amount	(4)	1	(14)	5
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	1	(1)	10	4
Reclassification/amortization, Net of Tax Amount	(2)	4	(20)	(8)
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)	(1)	(3)
Reclassification/amortization, Net of Tax Amount	1	2	4	9
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	0	(1)	3	2
Reclassification/amortization, Net of Tax Amount	0	3	(7)	(4)
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	59	(44)	44	1
Reclassification/amortization, Net of Tax Amount	(175)	131	(132)	(4)
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)	(4)	(6)	(14)
Reclassification/amortization, Net of Tax Amount	6	11	18	43
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	0	4	(10)	(7)
Other (income) and expense	(234)	175	(176)	(6)
Interest expense	8	14	24	57
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	(5)	2	(19)	6
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	(3)	5	(30)	(12)
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	3	5	12
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Other Comprehensive Income (Loss), before Tax	3,072	230	3,592	494
Other comprehensive income/(loss), Tax (Expense)/Benefit	(779)	(63)	(921)	(132)
Other comprehensive income/(loss)	2,293	167	2,672	361
Unrealized gains/(losses) arising during the period, Net of Tax Amount			78	86
Reclassification/amortization, Net of Tax Amount			2,594	276
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	0
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	0	0	0	1
Unrealized gains/(losses) arising during the period, Net of Tax Amount	0	0	0	1
Reclassification/amortization, Before Tax Amount	(2)	(2)	(5)	(6)
Reclassification/amortization, Tax (Expense)/Benefit	0	1	1	2
Reclassification/amortization, Net of Tax Amount	(1)	(2)	(4)	(5)
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	100	102	101	104
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit	(25)	(26)	(23)	(19)
Unrealized gains/(losses) arising during the period, Net of Tax Amount	75	77	78	85
Reclassification/amortization, Before Tax Amount	246	128	765	389
Reclassification/amortization, Tax (Expense)/Benefit	(68)	(37)	(212)	(113)
Reclassification/amortization, Net of Tax Amount	178	91	554	276
Retirement-Related Benefit Plans, Curtailments and Settlements
Reclassifications and Taxes Related to Items of Other Comprehensive Income
Reclassification/amortization, Before Tax Amount	2,727	2	2,731	7
Reclassification/amortization, Tax (Expense)/Benefit	(686)	(1)	(687)	(2)
Reclassification/amortization, Net of Tax Amount	$ 2,041	$ 1	$ 2,044	$ 5