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Segment Reporting - Net Revenues by Product Category (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Net revenues $ 28,720 $ 26,581 $ 25,868
Biscuits      
Segment Reporting Information [Line Items]      
Net revenues 13,524 12,766 11,438
Chocolate      
Segment Reporting Information [Line Items]      
Net revenues 9,299 8,179 8,158
Gum & Candy      
Segment Reporting Information [Line Items]      
Net revenues 2,872 2,662 3,355
Beverages      
Segment Reporting Information [Line Items]      
Net revenues 1,035 1,049 1,095
Cheese & Grocery      
Segment Reporting Information [Line Items]      
Net revenues 1,990 1,925 1,822
Latin America      
Segment Reporting Information [Line Items]      
Net revenues 2,797 2,477 3,018
Latin America | Biscuits      
Segment Reporting Information [Line Items]      
Net revenues 798 668 708
Latin America | Chocolate      
Segment Reporting Information [Line Items]      
Net revenues 759 610 710
Latin America | Gum & Candy      
Segment Reporting Information [Line Items]      
Net revenues 567 474 823
Latin America | Beverages      
Segment Reporting Information [Line Items]      
Net revenues 359 403 452
Latin America | Cheese & Grocery      
Segment Reporting Information [Line Items]      
Net revenues 314 322 325
AMEA      
Segment Reporting Information [Line Items]      
Net revenues 6,465 5,740 5,770
AMEA | Biscuits      
Segment Reporting Information [Line Items]      
Net revenues 2,253 2,039 1,844
AMEA | Chocolate      
Segment Reporting Information [Line Items]      
Net revenues 2,396 2,025 2,082
AMEA | Gum & Candy      
Segment Reporting Information [Line Items]      
Net revenues 816 696 861
AMEA | Beverages      
Segment Reporting Information [Line Items]      
Net revenues 550 544 546
AMEA | Cheese & Grocery      
Segment Reporting Information [Line Items]      
Net revenues 450 436 437
Europe      
Segment Reporting Information [Line Items]      
Net revenues 11,156 10,207 9,972
Europe | Biscuits      
Segment Reporting Information [Line Items]      
Net revenues 3,328 3,035 2,998
Europe | Chocolate      
Segment Reporting Information [Line Items]      
Net revenues 5,862 5,291 5,119
Europe | Gum & Candy      
Segment Reporting Information [Line Items]      
Net revenues 614 612 698
Europe | Beverages      
Segment Reporting Information [Line Items]      
Net revenues 126 102 97
Europe | Cheese & Grocery      
Segment Reporting Information [Line Items]      
Net revenues 1,226 1,167 1,060
North America      
Segment Reporting Information [Line Items]      
Net revenues 8,302 8,157 7,108
North America | Biscuits      
Segment Reporting Information [Line Items]      
Net revenues 7,145 7,024 5,888
North America | Chocolate      
Segment Reporting Information [Line Items]      
Net revenues 282 253 247
North America | Gum & Candy      
Segment Reporting Information [Line Items]      
Net revenues 875 880 973
North America | Beverages      
Segment Reporting Information [Line Items]      
Net revenues 0 0 0
North America | Cheese & Grocery      
Segment Reporting Information [Line Items]      
Net revenues $ 0 $ 0 $ 0