v3.25.4
Pension and other postretirement benefits - Schedule of Changes in Benefit Obligations and Changes in Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension Plan      
Change in fair value of plan assets:      
Plan transfer in $ 55    
U.S. | Pension Plan      
Change in benefit obligation:      
Benefit obligation, beginning of year 79 $ 82  
Service cost 0 0 $ 0
Interest cost 4 4 38
Actuarial (gains) and losses 0 0  
Benefits paid (6) (7)  
Settlements 0 0  
Foreign currency rate changes 0 0  
Plan transfer in 0 0  
Benefit obligation, end of year 77 79 82
Change in fair value of plan assets:      
Fair value of plan assets, beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 6 7  
Plan transfer in 0 0  
Benefits paid (6) (7)  
Settlements 0 0  
Foreign currency rate changes 0 0  
Fair value of plan assets, end of year 0 0 0
Funded status (77) (79)  
Noncurrent assets 0 0  
Current liabilities (7) (7)  
Noncurrent liabilities (70) (72)  
Funded status at end of year (77) (79)  
U.S. | Other Postretirement Benefits Plan      
Change in benefit obligation:      
Benefit obligation, beginning of year 49 55  
Service cost 0 0 0
Interest cost 2 2 3
Actuarial (gains) and losses (1) (2)  
Benefits paid (6) (6)  
Foreign currency rate changes 0 0  
Benefit obligation, end of year 44 49 55
Change in fair value of plan assets:      
Fair value of plan assets, beginning of year 0 0  
Employer contributions 6 6  
Benefits paid (6) (6)  
Fair value of plan assets, end of year 0 0 0
Funded status (44) (49)  
Current liabilities (7) (8)  
Noncurrent liabilities (37) (41)  
Funded status at end of year (44) (49)  
Non-U.S. | Pension Plan      
Change in benefit obligation:      
Benefit obligation, beginning of year 215 747  
Service cost 4 2 2
Interest cost 11 33 33
Actuarial (gains) and losses (9) 8  
Benefits paid (7) (44)  
Settlements 0 (496)  
Foreign currency rate changes 11 (35)  
Plan transfer in 53 0  
Benefit obligation, end of year 278 215 747
Change in fair value of plan assets:      
Fair value of plan assets, beginning of year 175 669  
Actual return on plan assets 5 39  
Employer contributions 8 37  
Plan transfer in 55 0  
Benefits paid (7) (44)  
Settlements 0 (496)  
Foreign currency rate changes 10 (30)  
Fair value of plan assets, end of year 246 175 669
Funded status (32) (40)  
Noncurrent assets 28 20  
Current liabilities (5) (4)  
Noncurrent liabilities (55) (56)  
Funded status at end of year (32) (40)  
Non-U.S. | Other Postretirement Benefits Plan      
Change in benefit obligation:      
Benefit obligation, beginning of year 70 75  
Service cost 1 1 1
Interest cost 3 3 3
Actuarial (gains) and losses (1) 0  
Benefits paid (5) (5)  
Foreign currency rate changes 3 (4)  
Benefit obligation, end of year 71 70 75
Change in fair value of plan assets:      
Fair value of plan assets, beginning of year 0 0  
Employer contributions 5 5  
Benefits paid (5) (5)  
Fair value of plan assets, end of year 0 0 $ 0
Funded status (71) (70)  
Current liabilities (4) (4)  
Noncurrent liabilities (67) (66)  
Funded status at end of year $ (71) $ (70)