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Earnings per Share - Narrative (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stock Options and Performance Share Units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Mondelēz International stock options excluded from the calculation of diluted EPS (in shares) 3.6 4.0