Intangible assets, net - Summary of intangible assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross	$ 3,092	$ 2,030
Accumulated amortization	(1,044)	(819)
Total intangible assets, net	2,048	1,211
Marketing-related
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross	349	337
Customer-related
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross	1,493	1,394
Contract-based (ii)
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross	969	110
Contract-based (ii) | Eco Material Technologies (Eco Material)
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross	789
Software costs
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross	202	126
IT projects in progress
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross	$ 79	$ 63