Equity method investments - Unaudited financial information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 28, 2024	Sep. 30, 2024	Dec. 31, 2023	Dec. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Schedule Of Equity Method Investments [Line Items]
Assets	$ 1,153,881			$ 1,069,978			$ 948,465
Liabilities	502,226			499,208
Sales/ Total revenues and other income	$ 371,433			$ 364,482			302,020
The Kraft Heinz Company [Member]
Schedule Of Equity Method Investments [Line Items]
Assets		$ 88,287			$ 90,339
Liabilities		38,962			40,617
Sales/ Total revenues and other income		25,846			26,640		26,485
Net earnings attributable to common shareholders		$ 2,744			$ 2,855		$ 2,363
Occidental Petroleum Corporation [Member]
Schedule Of Equity Method Investments [Line Items]
Assets			$ 85,803			$ 71,287
Liabilities			50,869			42,515
Sales/ Total revenues and other income			27,572			29,715
Net earnings attributable to common shareholders			$ 3,703			$ 4,471