Acquisitions and Divestitures (Details) - USD ($) $ in Millions			3 Months Ended		12 Months Ended
	Apr. 01, 2020	Jul. 16, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Acquisition-related costs			$ 5	$ 0
Goodwill			20,216		$ 20,848
North America
Business Acquisition [Line Items]
Goodwill			9,301		9,356
AMEA
Business Acquisition [Line Items]
Goodwill			2,981		3,151
AMEA | Cheese Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Proceeds from divestiture of businesses					161
Current assets divested					19
Non-current assets divested					96
Pre-tax gain on divestiture					$ 44
Decline in quarter-over-quarter net revenues due to business divestiture			33
Perfect Snacks | North America
Business Acquisition [Line Items]
Payment to acquire business, net of cash received		$ 284
Definite-lived intangibles assets acquired			31
Indefinite-lived intangibles assets acquired			107
Goodwill			150
Property, plant, and equipment acquired			1
Inventory acquired			12
Accounts receivable acquired			8
Current liabilities assumed			13
Deferred tax liabilities assumed			3
Other liabilities assumed			9
Incremental revenues from acquisition			32
Give & Go
Business Acquisition [Line Items]
Acquisition-related costs			$ 5
Subsequent Event | Give & Go
Business Acquisition [Line Items]
Payment to acquire business, net of cash received	$ 1,200