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Postretirement benefit plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
U.S. | Defined benefit plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2 $ 2
Interest cost 6 6
Expected return on plan assets (4) (6)
Recognized net actuarial losses (gains) 2 1
Net periodic benefit costs (credits) 6 3
U.S. | Retiree health care plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 3 3
Expected return on plan assets (3) (3)
Recognized net actuarial losses (gains) 0 (1)
Net periodic benefit costs (credits) 0 (1)
Non-U.S. | Defined benefit plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 4 4
Interest cost 14 14
Expected return on plan assets (18) (19)
Recognized net actuarial losses (gains) 1 3
Net periodic benefit costs (credits) $ 1 $ 2