Segment information - Energy & transportation sales (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Energy and transportation sales
Total sales and revenues	$ 64,809	$ 67,060	$ 59,427
Energy & Transportation
Energy and transportation sales
Total sales and revenues	24,088	23,355	19,337
Energy & Transportation | Oil and gas
Energy and transportation sales
Total sales and revenues	6,980	6,988	5,330
Energy & Transportation | Power generation
Energy and transportation sales
Total sales and revenues	7,756	6,362	4,940
Energy & Transportation | Industrial
Energy and transportation sales
Total sales and revenues	3,990	4,871	4,426
Energy & Transportation | Transportation
Energy and transportation sales
Total sales and revenues	$ 5,362	$ 5,134	$ 4,641