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Segment Reporting - Net Revenues by Product Category (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Net revenues $ 7,238 $ 6,707
Biscuits    
Segment Reporting Information [Line Items]    
Net revenues 3,298 3,026
Chocolate    
Segment Reporting Information [Line Items]    
Net revenues 2,477 2,156
Gum & Candy    
Segment Reporting Information [Line Items]    
Net revenues 651 781
Beverages    
Segment Reporting Information [Line Items]    
Net revenues 307 298
Cheese & Grocery    
Segment Reporting Information [Line Items]    
Net revenues 505 446
Latin America    
Segment Reporting Information [Line Items]    
Net revenues 669 726
Latin America | Biscuits    
Segment Reporting Information [Line Items]    
Net revenues 177 174
Latin America | Chocolate    
Segment Reporting Information [Line Items]    
Net revenues 192 194
Latin America | Gum & Candy    
Segment Reporting Information [Line Items]    
Net revenues 131 182
Latin America | Beverages    
Segment Reporting Information [Line Items]    
Net revenues 94 102
Latin America | Cheese & Grocery    
Segment Reporting Information [Line Items]    
Net revenues 75 74
AMEA    
Segment Reporting Information [Line Items]    
Net revenues 1,745 1,502
AMEA | Biscuits    
Segment Reporting Information [Line Items]    
Net revenues 583 508
AMEA | Chocolate    
Segment Reporting Information [Line Items]    
Net revenues 670 543
AMEA | Gum & Candy    
Segment Reporting Information [Line Items]    
Net revenues 194 185
AMEA | Beverages    
Segment Reporting Information [Line Items]    
Net revenues 180 171
AMEA | Cheese & Grocery    
Segment Reporting Information [Line Items]    
Net revenues 118 95
Europe    
Segment Reporting Information [Line Items]    
Net revenues 2,847 2,584
Europe | Biscuits    
Segment Reporting Information [Line Items]    
Net revenues 802 746
Europe | Chocolate    
Segment Reporting Information [Line Items]    
Net revenues 1,552 1,363
Europe | Gum & Candy    
Segment Reporting Information [Line Items]    
Net revenues 148 173
Europe | Beverages    
Segment Reporting Information [Line Items]    
Net revenues 33 25
Europe | Cheese & Grocery    
Segment Reporting Information [Line Items]    
Net revenues 312 277
North America    
Segment Reporting Information [Line Items]    
Net revenues 1,977 1,895
North America | Biscuits    
Segment Reporting Information [Line Items]    
Net revenues 1,736 1,598
North America | Chocolate    
Segment Reporting Information [Line Items]    
Net revenues 63 56
North America | Gum & Candy    
Segment Reporting Information [Line Items]    
Net revenues 178 241
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