Equity method investments - Summary of earnings and distributions received from equity method investments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	$ 493	$ 688
Distributions Received	175	155
Kraft Heinz [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	215	222
Distributions Received	130	130
Occidental [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	263	370
Distributions Received	41	25
Other [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	15	$ 96
Distributions Received	$ 4