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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule Of Equity Method Investments [Line Items]
Equity in Earnings	$ 262	$ 415	$ 1,461	$ 958
Distributions Received	193	205	535	555
Kraft Heinz [Member]
Schedule Of Equity Method Investments [Line Items]
Equity in Earnings	69	114	556	391
Distributions Received	131	131	391	391
Occidental [Member]
Schedule Of Equity Method Investments [Line Items]
Equity in Earnings	169		773
Distributions Received	40		101
Other [Member]
Schedule Of Equity Method Investments [Line Items]
Equity in Earnings	24	301	132	567
Distributions Received	$ 22	$ 74	$ 43	$ 164