v3.25.2
Postretirement benefit plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
U.S. | Defined benefit plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2 $ 2 $ 4 $ 4
Interest cost 7 6 13 12
Expected return on plan assets (6) (5) (10) (11)
Recognized net actuarial losses (gains) 2 1 4 2
Net periodic benefit costs (credits) 5 4 11 7
Settlement losses 3 0 3 0
Total, including other postretirement losses (gains) 8 4 14 7
U.S. | Retiree health care plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 1 1
Interest cost 3 3 6 6
Expected return on plan assets (3) (6) (6) (9)
Recognized net actuarial losses (gains) (1) 0 (1) (1)
Net periodic benefit costs (credits) 0 (2) 0 (3)
Settlement losses 0 0 0 0
Total, including other postretirement losses (gains) 0 (2) 0 (3)
Non-U.S. | Defined benefit plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 4 7 8
Interest cost 15 13 29 27
Expected return on plan assets (17) (19) (35) (38)
Recognized net actuarial losses (gains) 1 3 2 6
Net periodic benefit costs (credits) 2 1 3 3
Settlement losses 0 0 0 0
Total, including other postretirement losses (gains) $ 2 $ 1 $ 3 $ 3