Equity method investments - Unaudited financial information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 27, 2021	Dec. 31, 2020	Dec. 26, 2020
Schedule of Equity Method Investments [Line Items]
Assets	$ 884,393			$ 873,729
Liabilities	428,217			$ 422,393
Sales	64,599	$ 61,265
The Kraft Heinz Company [Member]
Schedule of Equity Method Investments [Line Items]
Assets			$ 98,664		$ 99,830
Liabilities			$ 48,233		$ 49,587
Sales	6,394	6,157
Net earnings attributable to Kraft Heinz common shareholders	$ 563	$ 378