Segment information - Summary of adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting [Abstract]
Adjusted EBITDA	$ 586	$ 495
Depreciation, depletion, and amortization	(576)	(477)
Loss on impairments	(48)	0
Interest income	21	37
Interest expense	(203)	(181)
Loss on divestitures and investments	(6)	(26)
Pension income excluding current service cost component	5	4
Other interest, net	(3)	2
Loss from operations before income tax benefit and loss from equity method investments	$ (224)	$ (146)