Additional financial information - Other noncurrent assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Pension assets	$ 296	$ 271	$ 358
Other	534	361	334
Total other noncurrent assets	$ 830	$ 632	$ 692