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Equity Activity (Tables)
 12 Months Ended
Dec. 31, 2025
Stockholders' Equity Note [Abstract]  
Reclassifications and taxes related to items of other comprehensive income
($ in millions)
For the year ended December 31, 2025:Before Tax
Amount		Tax (Expense)/
Benefit		Net of Tax
Amount
Other comprehensive income/(loss)   
Foreign currency translation adjustments$(972)$528 $(445)
Net unrealized gains/(losses) on available-for-sale securities$(1)$0 $(1)
Unrealized gains/(losses) on cash flow hedges
Unrealized gains/(losses) arising during the period$(66)$8 $(58)
Reclassification of (gains)/losses to:
Cost of services27 (7)20 
Cost of sales15 (4)11 
Cost of financing4 (1)3 
SG&A expense6 (2)4 
Other (income) and expense(525)132 (393)
Interest expense24 (6)18 
Total unrealized gains/(losses) on cash flow hedges$(514)$121 $(394)
Retirement-related benefit plans (1)
Prior service costs/(credits)$(469)$117 $(351)
Net gains/(losses) arising during the period392 (168)224 
Curtailments and settlements9 (3)6 
Amortization of prior service costs/(credits)(7)2 (5)
Amortization of net (gains)/losses623 (104)519 
Total retirement-related benefit plans$548 $(154)$394 
Other comprehensive income/(loss)$(939)$494 $(445)
(1)These AOCI components are included in the computation of net periodic pension cost. Refer to note U, “Retirement-Related Benefits,” for additional information.
($ in millions)
For the year ended December 31, 2024:Before Tax
Amount		Tax (Expense)/
Benefit		Net of Tax
Amount
Other comprehensive income/(loss)   
Foreign currency translation adjustments$301 $(324)$(23)
Net unrealized gains/(losses) on available-for-sale securities$2 $0 $1 
Unrealized gains/(losses) on cash flow hedges   
Unrealized gains/(losses) arising during the period$389 $(113)$276 
Reclassification of (gains)/losses to:   
Cost of services(22)6 (16)
Cost of sales(40)13 (27)
Cost of financing6 (2)5 
SG&A expense(16)5 (11)
Other (income) and expense125 (32)94 
Interest expense31 (8)24 
Total unrealized gains/(losses) on cash flow hedges$474 $(130)$343 
Retirement-related benefit plans (1)
   
Prior service costs/(credits)$(56)$11 $(45)
Net gains/(losses) arising during the period70 (65)6 
Curtailments and settlements3,159 (719)2,441 
Amortization of prior service costs/(credits)(7)2 (5)
Amortization of net (gains)/losses975 (201)775 
Total retirement-related benefit plans$4,142 $(971)$3,171 
Other comprehensive income/(loss)$4,919 $(1,426)$3,492 
(1)These AOCI components are included in the computation of net periodic pension cost and include the impact of pension settlement charges of $3.1 billion ($2.4 billion net of tax). Refer to note U, “Retirement-Related Benefits,” for additional information.
Accumulated Other Comprehensive Income/(Loss) (net of tax)
($ in millions)
For the year ended December 31, 2023:Before Tax
Amount		Tax (Expense)/
Benefit		Net of Tax
Amount
Other comprehensive income/(loss)   
Foreign currency translation adjustments$3 $100 $103 
Net unrealized gains/(losses) on available-for-sale securities$0 $0 $0 
Unrealized gains/(losses) on cash flow hedges   
Unrealized gains/(losses) arising during the period$207 $(63)$144 
Reclassification of (gains)/losses to:   
Cost of services5 (1)5 
Cost of sales(22)8 (14)
Cost of financing14 (3)10 
SG&A expense(12)4 (8)
Other (income) and expense(209)53 (157)
Interest expense66 (17)49 
Total unrealized gains/(losses) on cash flow hedges$47 $(19)$28 
Retirement-related benefit plans (1)
   
Prior service costs/(credits)$2 $0 $2 
Net gains/(losses) arising during the period(3,115)536 (2,579)
Curtailments and settlements5 (1)4 
Amortization of prior service costs/(credits)(9)3 (6)
Amortization of net (gains)/losses515 (88)427 
Total retirement-related benefit plans$(2,602)$450 $(2,152)
Other comprehensive income/(loss)$(2,552)$531 $(2,021)
(1)These AOCI components are included in the computation of net periodic pension cost. Refer to note U, “Retirement-Related Benefits,” for additional information.
Accumulated other comprehensive income/(loss) (net of tax)
($ in millions)
Foreign
Currency
Translation
Adjustments (1)
Net Unrealized
Gains/(Losses)
on Available-
For-Sale
Securities		Net Unrealized
Gains/(Losses)
on Cash Flow
Hedges		 Net Change
Retirement-
Related
Benefit
Plans		Accumulated
Other
Comprehensive
Income/(Loss)
December 31, 2022$(3,591)$(1)$(135)$(13,013)$(16,740)
Other comprehensive income before reclassifications103 0 144 (2,577)(2,331)
Amount reclassified from accumulated other comprehensive income— — (115)425 310 
Total change for the period103 0 28 (2,152)(2,021)
December 31, 2023(3,488)(1)(106)(15,165)(18,761)
Other comprehensive income before reclassifications(23)1 276 (39)215 
Amount reclassified from accumulated other comprehensive income (2)
— — 67 3,210 3,278 
Total change for the period(23)1 343 3,171 3,492 
December 31, 2024(3,512)0 237 (11,994)(15,269)
Other comprehensive income before reclassifications(445)(1)(58)(127)(630)
Amount reclassified from accumulated other comprehensive income— — (336)521 185 
Total change for the period(445)(1)(394)394 (445)
December 31, 2025$(3,956)$0 $(157)$(11,600)$(15,713)
(1)Foreign currency translation adjustments are presented gross except for any associated hedges which are presented net of tax.
(2)Net change in retirement-related benefit plans includes the impact of pension settlement charges of $3.1 billion ($2.4 billion net of tax). Refer to note U, “Retirement-Related Benefits,” for additional information.