Pension and other postretirement benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Other postretirement benefits plan
Amortization of:
Net periodic benefit cost	$ 1	$ 1	$ 3	$ 3
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	6	6	18	18
Expected return on assets	(5)	(5)	(15)	(15)
Amortization of:
Past service credit	0	0	0	0
Actuarial loss	1	1	3	3
Settlement gain	0	0	0	0
Net periodic benefit cost	2	2	6	6
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	9	30	25
Interest cost	22	23	64	69
Expected return on assets	(23)	(23)	(67)	(69)
Amortization of:
Past service credit	(3)	(3)	(9)	(9)
Actuarial loss	1	0	3	0
Settlement gain	0	0	(3)	0
Net periodic benefit cost	$ 7	$ 6	$ 18	$ 16