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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

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- Definition Defined Benefit Plan, Recognized Net Gain (Loss) Due to Change in Eligibility Requirement and Change in Benefits to Medicare-eligible Participants + References No definition available. + Details
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Namespace Prefix: | mdlz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration