Acquistions, West Africa Investments, Goodwill and Other Intangible Assets Acquisitions, West Africa Investments, Goodwill and Other Intangible Assets - Impairment Testing (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 28, 2019	Sep. 28, 2019	Mar. 30, 2019	Dec. 29, 2018
Goodwill [Line Items]
Goodwill	$ 5,842	$ 5,842		$ 6,050
Divestiture Goodwill		191
Divestiture net intangibles		765
Indefinite-lived Intangible Assets Acquired		18
Kashi
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount				18.00%
Europe transfer to AMEA
Goodwill [Line Items]
Goodwill			$ 46
North America
Goodwill [Line Items]
Goodwill	4,420	4,420		$ 4,611
Divestiture Goodwill		191
Divestiture net intangibles		765
Indefinite-lived Intangible Assets Acquired	$ 18	$ 18