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Leases - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2018
Lessee, Lease, Description [Line Items] |  |
Option to extend leases | 6 years |
Rent expense under prior lease accounting rules (ASC 840) |  | $ 260
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Remaining term of leases | 1 year |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Remaining term of leases | 19 years |

X
- Definition Lessee, Lease, Renewal Term + References No definition available. + Details
Name: | mdlz_LesseeLeaseRenewalTerm
Namespace Prefix: | mdlz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Remaining Lease Term + References No definition available. + Details
Name: | mdlz_LesseeRemainingLeaseTerm
Namespace Prefix: | mdlz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |