Benefit Plans - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jul. 11, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plan, Type [Extensible List]				us-gaap:PensionPlanMember
Multiemployer Plan, Pension, Significant, Name [Extensible List]				mdlz:BakeryAndConfectioneryUnionAndIndustryInternationalPensionFundMember
U.S. Plans | North America
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, withdrawal liability	$ 526	$ 383		$ 383
Multiemployer plan, withdrawal obligation term	20 years
Multiemployer plan, final adjustment to reduce withdrawal liability			$ 35
Multiemployer plan, final adjustment to reduce withdrawal liability, net of tax			$ 26
Multiemployer plan, accreted interest on the long-term liability		3		6
Other current liabilities | U.S. Plans | North America
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, withdrawal liability		14		14
Long-term other liabilities | U.S. Plans | North America
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, withdrawal liability		369		369
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contribution				11
Estimated future employer contributions		5		5
Pension Plans | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contribution				104
Estimated future employer contributions		$ 86		86
Pension Plans | United Kingdom and Ireland
Defined Benefit Plan Disclosure [Line Items]
Employer contribution				$ 50