Segment Reporting - Net Revenues by Product Category (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	[1]
Segment Reporting Information [Line Items]
Net revenues	$ 7,764	$ 7,238
Biscuits
Segment Reporting Information [Line Items]
Net revenues	3,631	3,306
Chocolate
Segment Reporting Information [Line Items]
Net revenues	2,543	2,469
Gum & Candy
Segment Reporting Information [Line Items]
Net revenues	787	651
Beverages
Segment Reporting Information [Line Items]
Net revenues	331	307
Cheese & Grocery
Segment Reporting Information [Line Items]
Net revenues	472	505
Latin America
Segment Reporting Information [Line Items]
Net revenues	826	669
Latin America | Biscuits
Segment Reporting Information [Line Items]
Net revenues	224	177
Latin America | Chocolate
Segment Reporting Information [Line Items]
Net revenues	248	192
Latin America | Gum & Candy
Segment Reporting Information [Line Items]
Net revenues	172	131
Latin America | Beverages
Segment Reporting Information [Line Items]
Net revenues	102	94
Latin America | Cheese & Grocery
Segment Reporting Information [Line Items]
Net revenues	80	75
AMEA
Segment Reporting Information [Line Items]
Net revenues	1,867	1,745
AMEA | Biscuits
Segment Reporting Information [Line Items]
Net revenues	657	583
AMEA | Chocolate
Segment Reporting Information [Line Items]
Net revenues	706	670
AMEA | Gum & Candy
Segment Reporting Information [Line Items]
Net revenues	203	194
AMEA | Beverages
Segment Reporting Information [Line Items]
Net revenues	197	180
AMEA | Cheese & Grocery
Segment Reporting Information [Line Items]
Net revenues	104	118
Europe
Segment Reporting Information [Line Items]
Net revenues	2,935	2,847
Europe | Biscuits
Segment Reporting Information [Line Items]
Net revenues	951	810
Europe | Chocolate
Segment Reporting Information [Line Items]
Net revenues	1,512	1,544
Europe | Gum & Candy
Segment Reporting Information [Line Items]
Net revenues	152	148
Europe | Beverages
Segment Reporting Information [Line Items]
Net revenues	32	33
Europe | Cheese & Grocery
Segment Reporting Information [Line Items]
Net revenues	288	312
North America
Segment Reporting Information [Line Items]
Net revenues	2,136	1,977
North America | Biscuits
Segment Reporting Information [Line Items]
Net revenues	1,799	1,736
North America | Chocolate
Segment Reporting Information [Line Items]
Net revenues	77	63
North America | Gum & Candy
Segment Reporting Information [Line Items]
Net revenues	260	178
North America | Beverages
Segment Reporting Information [Line Items]
Net revenues	0	0
North America | Cheese & Grocery
Segment Reporting Information [Line Items]
Net revenues	$ 0	$ 0

[1] Our snack product categories include biscuits, chocolate and gum & candy. During 2022, we realigned some of our products between our biscuits and chocolate categories; as such, we reclassified the product category net revenues on a basis consistent with the 2022 presentation.