v3.25.4
Pension and other postretirement benefits - Schedule of Benefit Obligations and Amounts Classified in AOCI (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
U.S. | Pension Plan    
Amounts recognized in Accumulated other comprehensive loss:    
Net actuarial (gain) loss $ (16) $ (17)
Total $ (16) $ (17)
Weighted-average assumptions used to determine benefit obligations:    
Discount rate 5.30% 5.50%
Rate of compensation increase 0.00% 0.00%
Interest crediting rate 3.00% 3.00%
U.S. | Other Postretirement Benefits Plan    
Amounts recognized in Accumulated other comprehensive loss:    
Net actuarial (gain) loss $ (21) $ (22)
Total $ (21) $ (22)
Weighted-average assumptions used to determine benefit obligations:    
Discount rate 5.10% 5.40%
Non-U.S. | Pension Plan    
Amounts recognized in Accumulated other comprehensive loss:    
Net actuarial (gain) loss $ 3 $ 8
Total $ 3 $ 8
Weighted-average assumptions used to determine benefit obligations:    
Discount rate 4.10% 4.70%
Rate of compensation increase 2.40% 2.50%
Interest crediting rate 2.50% 0.00%
Non-U.S. | Other Postretirement Benefits Plan    
Amounts recognized in Accumulated other comprehensive loss:    
Net actuarial (gain) loss $ (17) $ (16)
Total $ (17) $ (16)
Weighted-average assumptions used to determine benefit obligations:    
Discount rate 4.90% 4.70%