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Equity method investments - Unaudited financial information (Detail) - USD ($) $ in Millions	3 Months Ended						6 Months Ended	9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Jun. 28, 2025	Sep. 30, 2024	Sep. 28, 2024	Jun. 30, 2024	Jun. 28, 2025	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 28, 2024	Jun. 30, 2024	Dec. 31, 2024	Dec. 28, 2024
Schedule Of Equity Method Investments [Line Items]
Assets	$ 1,225,963							$ 1,225,963					$ 1,153,881
Liabilities	525,522							525,522					$ 502,226
Sales/ Total revenues and other income	$ 94,972			$ 92,995				$ 277,212		$ 276,517
Occidental Petroleum Corporation [Member]
Schedule Of Equity Method Investments [Line Items]
Assets		$ 84,360		85,803					$ 84,360	85,803
Liabilities		48,184		$ 50,869					48,184	$ 50,869
Sales/ Total revenues and other income		6,456				$ 6,879			20,136			$ 20,418
Net earnings attributable to common shareholders		$ 288				$ 992			$ 757			$ 2,739
The Kraft Heinz Company [Member]
Schedule Of Equity Method Investments [Line Items]
Assets			$ 81,581				$ 81,581							$ 88,287
Liabilities			40,089				40,089							$ 38,962
Sales/ Total revenues and other income			6,352		$ 6,383		12,351				$ 19,270
Net earnings attributable to common shareholders			$ (7,824)		$ (290)		$ (7,112)				$ 613

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