Business Acquisitions Divested Entities Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Business Acquisition [Line Items]
Income from discontinued operations	$ 0	$ 1	$ 0	$ 1
Food Group
Business Acquisition [Line Items]
Divested entities pro forma net sales		114		372
Income from discontinued operations		$ 3		$ 6
Divested entities pro forma basic earnings per share (per share)		$ 0.02		$ 0.03
Divested entities pro forma diluted earnings per share (per share)		$ 0.01		$ 0.03

Pro forma basic earnings per share or earnings per unit, which is commonly presented in initial public offerings based on the terms of the offering.

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