v3.25.4
Pension and other postretirement benefits - Schedule of Benefit Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
U.S. | Pension Plan      
Components of Net periodic benefit cost (credit):      
Service cost $ 0 $ 0 $ 0
Interest cost 4 4 38
Expected return on assets 0 0 (34)
Amortization of actuarial (gains) (1) (1) 0
Settlement loss 0 0 33
Net periodic benefit cost 3 3 37
Changes in plan assets and benefit obligations recognized in Other comprehensive (income) loss:      
Net actuarial (gain) loss 0 (1) 3
Amortization of actuarial loss (gain) 1 1 (33)
Foreign currency rate changes 0 0 0
Foreign currency rate changes 0 0 0
Total recognized in Other comprehensive (income) loss 1 0 (30)
Total recognized in Net periodic benefit cost and Other comprehensive (income) loss $ 4 $ 3 $ 7
Weighted-average assumptions used to determine benefit obligations:      
Discount rate 5.50% 4.80% 5.90%
Rate of compensation increase 0.00% 0.00% 0.00%
Expected long-term rate of return on plan assets 0.00% 0.00% 5.90%
Interest crediting rate 3.00% 3.00% 3.00%
U.S. | Other Postretirement Benefits Plan      
Components of Net periodic benefit cost (credit):      
Service cost $ 0 $ 0 $ 0
Interest cost 2 2 3
Amortization of actuarial (gains) (2) (2) (2)
Net periodic benefit cost 0 0 1
Changes in plan assets and benefit obligations recognized in Other comprehensive (income) loss:      
Net actuarial (gain) loss (1) (2) (3)
Amortization of actuarial loss (gain) 2 2 2
Foreign currency rate changes 0 0 0
Total recognized in Other comprehensive (income) loss 1 0 (1)
Total recognized in Net periodic benefit cost and Other comprehensive (income) loss $ 1 $ 0 $ 0
Weighted-average assumptions used to determine benefit obligations:      
Discount rate 5.40% 4.80% 4.90%
Non-U.S. | Pension Plan      
Components of Net periodic benefit cost (credit):      
Service cost $ 4 $ 2 $ 2
Interest cost 11 33 33
Expected return on assets (10) (31) (32)
Amortization of actuarial (gains) 0 0 0
Settlement loss 0 61 0
Net periodic benefit cost 5 65 3
Changes in plan assets and benefit obligations recognized in Other comprehensive (income) loss:      
Net actuarial (gain) loss (5) 0 40
Amortization of actuarial loss (gain) 0 (61) 0
Foreign currency rate changes 0 (3) 1
Foreign currency rate changes 0 3 (1)
Total recognized in Other comprehensive (income) loss (5) (64) 41
Total recognized in Net periodic benefit cost and Other comprehensive (income) loss $ 0 $ 1 $ 44
Weighted-average assumptions used to determine benefit obligations:      
Discount rate 4.10% 4.60% 5.00%
Rate of compensation increase 2.30% 2.50% 2.50%
Expected long-term rate of return on plan assets 4.90% 4.90% 5.20%
Interest crediting rate 2.90% 0.00% 0.00%
Non-U.S. | Other Postretirement Benefits Plan      
Components of Net periodic benefit cost (credit):      
Service cost $ 1 $ 1 $ 1
Interest cost 3 3 3
Amortization of actuarial (gains) 0 (1) (2)
Net periodic benefit cost 4 3 2
Changes in plan assets and benefit obligations recognized in Other comprehensive (income) loss:      
Net actuarial (gain) loss (1) 0 10
Amortization of actuarial loss (gain) 0 1 2
Foreign currency rate changes 0 1 0
Total recognized in Other comprehensive (income) loss (1) 2 12
Total recognized in Net periodic benefit cost and Other comprehensive (income) loss $ 3 $ 5 $ 14
Weighted-average assumptions used to determine benefit obligations:      
Discount rate 4.70% 4.70% 5.20%