Acquistions, West Africa Investments, Goodwill and Other Intangible Assets Acquisitions, West Africa Investments, Goodwill and Other Intangible Assets - Impairment Testing (Details) - USD ($) $ in Millions	Mar. 30, 2019	Dec. 29, 2018
Goodwill [Line Items]
Goodwill	$ 6,054	$ 6,050
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