Goodwill and Other Intangible Assets Annual Impairment Testing (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 28, 2019	Dec. 28, 2019	Dec. 29, 2018	Mar. 30, 2019	Dec. 30, 2017
Indefinite-lived Intangible Assets [Line Items]
Goodwill and other intangible assets		$ 8,400
Other intangible assets excluding goodwill		2,083	$ 2,840		$ 2,505
Goodwill		5,861	6,050		5,504
Divestiture Goodwill		191
Indefinite-lived intangible assets acquired		18	373
Europe transfer to AMEA
Indefinite-lived Intangible Assets [Line Items]
Goodwill				$ 46
North America
Indefinite-lived Intangible Assets [Line Items]
Other intangible assets excluding goodwill		1,238	1,985		1,985
Goodwill		4,422	4,611		$ 4,617
Divestiture Goodwill	$ 191	191
Divestiture net intangibles	765
Indefinite-lived intangible assets acquired	$ 18	18	$ 0
Pringles and cracker related trademarks | North America
Indefinite-lived Intangible Assets [Line Items]
Other intangible assets excluding goodwill		1,700
Multipro
Indefinite-lived Intangible Assets [Line Items]
Goodwill		606
RXBAR
Indefinite-lived Intangible Assets [Line Items]
Goodwill		$ 373