Equity method investments - Summary of earnings and distributions received from equity method investments (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	$ 222	$ 262	$ 967	$ 1,461
Distributions Received	205	193	579	535
Kraft Heinz [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	(78)	69	164	556
Distributions Received	131	131	391	391
Occidental [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	277	169	740	773
Distributions Received	55	40	151	101
Other [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	23	24	63	132
Distributions Received	$ 19	$ 22	$ 37	$ 43