Equity method investments - Unaudited financial information (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 27, 2020	Dec. 31, 2019	Dec. 28, 2019
Schedule of Equity Method Investments [Line Items]
Assets		$ 788,133		$ 788,133			$ 817,729
Liabilities		390,880		390,880			$ 389,166
Sales		56,840	$ 63,598	118,105	$ 124,276
The Kraft Heinz Company [Member]
Schedule of Equity Method Investments [Line Items]
Assets						$ 98,306		$ 101,450
Liabilities						$ 49,141		$ 49,701
Sales		6,648	6,406	12,805	12,365
Net earnings (loss) attributable to Kraft Heinz common shareholders*	[1]	$ (1,651)	$ 449	$ (1,273)	$ 854

[1] Includes goodwill and identifiable intangible asset impairment charges of approximately $2.6 billion and $500 million during the second quarters of 2020 and 2019, respectively, and $2.8 billion and $1.1 billion during the first six months of 2020 and 2019, respectively.