Postretirement benefit plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
U.S. | Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 2	$ 4	$ 4
Interest cost	6	7	12	14
Expected return on plan assets	(5)	(5)	(11)	(11)
Recognized net actuarial losses (gains)	1	1	2	3
Net periodic benefit costs (credits)	4	5	7	10
Settlement losses	0	1	0	1
Total, including other postretirement losses (gains)	4	6	7	11
U.S. | Retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1	1
Interest cost	3	3	6	7
Expected return on plan assets	(6)	(4)	(9)	(9)
Recognized net actuarial losses (gains)	0	(2)	(1)	(3)
Net periodic benefit costs (credits)	(2)	(2)	(3)	(4)
Settlement losses	0	0	0	0
Total, including other postretirement losses (gains)	(2)	(2)	(3)	(4)
Non-U.S. | Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4	8	8
Interest cost	13	15	27	29
Expected return on plan assets	(19)	(17)	(38)	(32)
Recognized net actuarial losses (gains)	3	3	6	6
Net periodic benefit costs (credits)	1	5	3	11
Settlement losses	0	1	0	1
Total, including other postretirement losses (gains)	$ 1	$ 6	$ 3	$ 12