Components of Net Periodic Postretirement Health Care Costs (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Gain related to a change in the eligibility requirement and a change in benefits to Medicare-eligible participants	$ 8	$ 24

Defined Benefit Plan, Recognized Net Gain (Loss) Due to Change in Eligibility Requirement and Change in Benefits to Medicare-eligible Participants

No definition available.

Name:	mdlz_DefinedBenefitPlanRecognizedNetGainLossDueToChangeInEligibilityRequirementAndChangeInBenefitsToMedicareeligibleParticipants
Namespace Prefix:	mdlz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration