Pension and other postretirement benefits - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
OPEB Plans (i)
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	$ (10)	$ 3	$ (32)
Prior service cost (credit)	0	0	0
Amortization or curtailment recognition of prior service (cost) credit	0	0	0
Amortization or settlement recognition of net (loss) gain	2	3	0
Foreign currency exchange effects	0	0	0
Total accumulated other comprehensive (loss) income	(8)	6	(32)
Amount recognized in net periodic pension benefit cost (income) and other comprehensive (income) loss	(2)	9	(26)
United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	(20)	(8)	(1)
Prior service cost (credit)	0	0	2
Amortization or curtailment recognition of prior service (cost) credit	0	0	(4)
Amortization or settlement recognition of net (loss) gain	(2)	(3)	(2)
Foreign currency exchange effects	0	0	0
Total accumulated other comprehensive (loss) income	(22)	(11)	(5)
Amount recognized in net periodic pension benefit cost (income) and other comprehensive (income) loss	(15)	(3)	(9)
Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	(17)	126	(292)
Prior service cost (credit)	0	(1)	(2)
Amortization or curtailment recognition of prior service (cost) credit	12	11	11
Amortization or settlement recognition of net (loss) gain	(5)	(4)	(13)
Foreign currency exchange effects	(4)	(2)	(27)
Total accumulated other comprehensive (loss) income	(14)	130	(323)
Amount recognized in net periodic pension benefit cost (income) and other comprehensive (income) loss	3	150	(295)
Non-U.S. | OPEB Plans (i)
Defined Benefit Plan Disclosure [Line Items]
Total accumulated other comprehensive (loss) income	$ 0	$ 1	$ (2)