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Segment Reporting - Net Revenues by Product Category (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Net revenues $ 6,538 $ 6,765
Biscuits    
Segment Reporting Information [Line Items]    
Net revenues 2,737 2,753
Chocolate    
Segment Reporting Information [Line Items]    
Net revenues 2,206 2,296
Gum & Candy    
Segment Reporting Information [Line Items]    
Net revenues 813 881
Beverages    
Segment Reporting Information [Line Items]    
Net revenues 321 361
Cheese & Grocery    
Segment Reporting Information [Line Items]    
Net revenues 461 474
Latin America    
Segment Reporting Information [Line Items]    
Net revenues 800 891
Latin America | Biscuits    
Segment Reporting Information [Line Items]    
Net revenues 170 183
Latin America | Chocolate    
Segment Reporting Information [Line Items]    
Net revenues 230 243
Latin America | Gum & Candy    
Segment Reporting Information [Line Items]    
Net revenues 200 224
Latin America | Beverages    
Segment Reporting Information [Line Items]    
Net revenues 123 161
Latin America | Cheese & Grocery    
Segment Reporting Information [Line Items]    
Net revenues 77 80
AMEA    
Segment Reporting Information [Line Items]    
Net revenues 1,541 1,542
AMEA | Biscuits    
Segment Reporting Information [Line Items]    
Net revenues 461 442
AMEA | Chocolate    
Segment Reporting Information [Line Items]    
Net revenues 557 573
AMEA | Gum & Candy    
Segment Reporting Information [Line Items]    
Net revenues 225 235
AMEA | Beverages    
Segment Reporting Information [Line Items]    
Net revenues 172 172
AMEA | Cheese & Grocery    
Segment Reporting Information [Line Items]    
Net revenues 126 120
Europe    
Segment Reporting Information [Line Items]    
Net revenues 2,551 2,706
Europe | Biscuits    
Segment Reporting Information [Line Items]    
Net revenues 734 795
Europe | Chocolate    
Segment Reporting Information [Line Items]    
Net revenues 1,360 1,423
Europe | Gum & Candy    
Segment Reporting Information [Line Items]    
Net revenues 173 186
Europe | Beverages    
Segment Reporting Information [Line Items]    
Net revenues 26 28
Europe | Cheese & Grocery    
Segment Reporting Information [Line Items]    
Net revenues 258 274
North America    
Segment Reporting Information [Line Items]    
Net revenues 1,646 1,626
North America | Biscuits    
Segment Reporting Information [Line Items]    
Net revenues 1,372 1,333
North America | Chocolate    
Segment Reporting Information [Line Items]    
Net revenues 59 57
North America | Gum & Candy    
Segment Reporting Information [Line Items]    
Net revenues 215 236
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