v3.26.1
Property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period $ 1,422    
Charge for the year 335 $ 325 $ 306
Property, plant and equipment at end of period 1,638 1,422  
Instruments not yet deployed 156 156  
Reconciliation of changes in property, plant and equipment      
Contractual commitments for acquisition of property, plant and equipment 62 15  
Disclosure of quantitative information about leases for lessee [abstract]      
Depreciation charge in the year (49) (54) (54)
Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period 4,284 4,242  
Exchange adjustment 160 (94)  
Additions 415 341  
Disposals (285) (185)  
Impairment (10) (12)  
Transfers 164 (8)  
Property, plant and equipment at end of period 4,728 4,284 4,242
Amortisation and impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period (2,862) (2,772)  
Exchange adjustment (115) 71  
Charge for the year 335 325  
Disposals 230 161  
Impairment 21 3  
Transfers (29)    
Property, plant and equipment at end of period $ (3,090) (2,862) (2,772)
Property, plant and equipment other than buildings | Minimum      
Reconciliation of changes in property, plant and equipment      
Useful lives, property, plant and equipment 3 years    
Property, plant and equipment other than buildings | Maximum      
Reconciliation of changes in property, plant and equipment      
Useful lives, property, plant and equipment 20 years    
Land and buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period $ 418    
Property, plant and equipment at end of period 398 418  
Right-of-use assets 153 137 157
Disclosure of quantitative information about leases for lessee [abstract]      
Opening Balance 137 157  
Exchange Adjustment 8 (5)  
Additions 43 25  
Depreciation charge in the year (35) (41)  
Impairment   1  
Net book value at 31 December 153 137 157
Land and buildings | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period 789 795  
Exchange adjustment 28 (15)  
Additions 44 28  
Disposals (91) (25)  
Transfers 8 6  
Property, plant and equipment at end of period 778 789 795
Land and buildings | Amortisation and impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period (371) (342)  
Exchange adjustment (14) 8  
Charge for the year 59 66  
Disposals 52 24  
Impairment 12 5  
Property, plant and equipment at end of period (380) (371) (342)
Land | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period 37    
Property, plant and equipment at end of period 32 37  
Instruments      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period 433    
Property, plant and equipment at end of period 608 433  
Instruments | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period 1,924 1,844  
Exchange adjustment 84 (61)  
Additions 211 225  
Disposals (96) (84)  
Transfers 166    
Property, plant and equipment at end of period 2,289 1,924 1,844
Instruments | Amortisation and impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period (1,491) (1,452)  
Exchange adjustment (69) 51  
Charge for the year 177 163  
Disposals 85 73  
Transfers (29)    
Property, plant and equipment at end of period $ (1,681) (1,491) (1,452)
Instruments | Minimum      
Reconciliation of changes in property, plant and equipment      
Useful lives, property, plant and equipment 3 years    
Instruments | Maximum      
Reconciliation of changes in property, plant and equipment      
Useful lives, property, plant and equipment 7 years    
Buildings | Minimum      
Reconciliation of changes in property, plant and equipment      
Useful lives, property, plant and equipment 20 years    
Buildings | Maximum      
Reconciliation of changes in property, plant and equipment      
Useful lives, property, plant and equipment 50 years    
Other      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period $ 449    
Property, plant and equipment at end of period 425 449  
Right-of-use assets 39 36 28
Disclosure of quantitative information about leases for lessee [abstract]      
Opening Balance 36 28  
Exchange Adjustment 2 (1)  
Additions 15 22  
Depreciation charge in the year (14) (13)  
Net book value at 31 December 39 36 28
Other | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period 1,449 1,433  
Exchange adjustment 42 (18)  
Additions 29 35  
Disposals (93) (69)  
Impairment (12)    
Transfers 39 68  
Property, plant and equipment at end of period 1,454 1,449 1,433
Other | Amortisation and impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period (1,000) (978)  
Exchange adjustment (32) 12  
Charge for the year 99 96  
Disposals 93 64  
Impairment 9 (2)  
Property, plant and equipment at end of period (1,029) (1,000) (978)
Assets in course of construction      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period 122    
Property, plant and equipment at end of period 207 122  
Assets in course of construction | Software      
Disclosure of detailed information about property, plant and equipment [line items]      
Transfers (2) (8)  
Assets in course of construction | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment at beginning of period 122 170  
Exchange adjustment 6    
Additions 131 53  
Disposals (5) (7)  
Impairment   (12)  
Reversal of impairment 2    
Transfers (49) (82)  
Property, plant and equipment at end of period $ 207 $ 122 $ 170