Debt and Borrowing Arrangements - Additional Information (Details) SFr in Millions | Oct. 15, 2020USD ($) | Oct. 06, 2020USD ($) | Oct. 06, 2020CHF (SFr) | Sep. 24, 2020USD ($) | Sep. 23, 2020USD ($) | Sep. 23, 2020EUR (€) | Sep. 04, 2020USD ($) | Jul. 02, 2020USD ($) | May 07, 2020USD ($) | May 04, 2020USD ($) | Apr. 13, 2020USD ($) | Mar. 30, 2020USD ($) | Mar. 30, 2020CHF (SFr) | Mar. 24, 2020USD ($) | Mar. 06, 2020USD ($) | Feb. 26, 2020USD ($) | Feb. 10, 2020USD ($) | Oct. 16, 2020USD ($) | Dec. 31, 2020USD ($) | Sep. 30, 2020USD ($) | Sep. 30, 2019USD ($) | Sep. 30, 2020USD ($) | Sep. 30, 2019USD ($) | Sep. 23, 2020EUR (€) | May 05, 2020USD ($) | Apr. 01, 2020USD ($) | Dec. 31, 2019USD ($) | Feb. 27, 2019USD ($) |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Short-term borrowings | | | | | | | | | | | | | | | | | | | | | $ 199,000,000 | | $ 199,000,000 | | | | | $ 2,638,000,000 | |
Repayment of debt | | | | | | | | | | | | | | | | | | | | | | | 2,196,000,000 | $ 415,000,000 | | | | | |
Proceeds from issuance of debt, net of discounts and associated financing costs | | | | | | | | | | | | | | | | | | | | | | | 5,987,000,000 | 1,596,000,000 | | | | | |
Interest and other expense, net | | | | | | | | | | | | | | | | | | | | | (89,000,000) | $ (205,000,000) | (364,000,000) | (386,000,000) | | | | | |
Fair value of debt | | | | | | | | | | | | | | | | | | | | | 21,638,000,000 | | 21,638,000,000 | | | | | 19,388,000,000 | |
Carrying value of debt | | | | | | | | | | | | | | | | | | | | | 20,114,000,000 | | 20,114,000,000 | | | | | 18,426,000,000 | |
Line of Credit | Credit facility borrowings | Multi-year Senior Unsecured Revolving Credit Facility Expiring February 27, 2024 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Credit facility, maximum borrowing capacity | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ 4,500,000,000 |
Total shareholders' equity, excluding accumulated other comprehensive earnings/(losses) | | | | | | | | | | | | | | | | | | | | | 38,200,000,000 | | 38,200,000,000 | | | | | | $ 24,600,000,000 |
Amounts drawn on the multi-year credit facility | | | | | | | | | | | | | | | | | | | | | 0 | | 0 | | | | | | |
Notes Payable | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from issuance of debt, net of discounts and associated financing costs | | | | | | $ 1,460,000,000 | € 1,240,000,000 | | | | | | | | | | | | | | | | | | | | | | |
Debt issued | € | | | | | | | | | | | | | | | | | | | | | | | | | € 1,250,000,000 | | | | |
Differed financing costs | | | | | | $ 13,700,000 | | | | | | | | | | | | | | | | | | | € 11,600,000 | | | | |
Notes Payable | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt retired | | | | | | | | | | | | | | | | | | | $ 949,700,000 | | | | | | | | | | |
Proceeds from issuance of debt, net of discounts and associated financing costs | | $ 1,250,000,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Notes Payable | Subsequent Event | Forecast | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Loss on extinguishment of debt | | | | | | | | | | | | | | | | | | | | $ 150,000,000 | | | | | | | | | |
Interest and other expense, net | | | | | | | | | | | | | | | | | | | | $ 3,900,000 | | | | | | | | | |
Notes Payable | 3.625% Notes Due May 2023 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt retired | | | | | | | | | | | | | | | | | | | $ 359,000,000 | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | | | | | | | 3.625% | | | | | | | | | | |
Notes Payable | 4.000% Notes Due February 2024 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt retired | | | | | | | | | | | | | | | | | | | $ 203,000,000 | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | | | | | | | 4.00% | | | | | | | | | | |
Notes Payable | 3.625% Notes Due February 2026 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt retired | | | | | | | | | | | | | | | | | | | $ 248,000,000 | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | | | | | | | 3.625% | | | | | | | | | | |
Notes Payable | 4.125% Notes Due May 2028 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt retired | | | | | | | | | | | | | | | | | | | $ 27,000,000 | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | | | | | | | 4.125% | | | | | | | | | | |
Notes Payable | 6.500% Notes Due November 2031 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt retired | | | | | | | | | | | | | | | | | | | $ 5,000,000 | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | | | | | | | 6.50% | | | | | | | | | | |
Notes Payable | 7.000% Notes Due August 2037 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt retired | | | | | | | | | | | | | | | | | | | $ 1,000,000 | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | | | | | | | 7.00% | | | | | | | | | | |
Notes Payable | 6.875% Notes Due February 2038 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt retired | | | | | | | | | | | | | | | | | | | $ 24,000,000 | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | | | | | | | 6.875% | | | | | | | | | | |
Notes Payable | 6.875% Notes Due January 2039 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt retired | | | | | | | | | | | | | | | | | | | $ 10,000,000 | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | | | | | | | 6.875% | | | | | | | | | | |
Notes Payable | 6.500% Notes Due February 2040 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt retired | | | | | | | | | | | | | | | | | | | $ 1,000,000 | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | | | | | | | 6.50% | | | | | | | | | | |
Notes Payable | 4.625% Notes Due May 2048 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt retired | | | | | | | | | | | | | | | | | | | $ 71,000,000 | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | | | | | | | 4.625% | | | | | | | | | | |
Notes Payable | 1.875% U.S. Dollar-denominated Notes Due October 1, 2032 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt interest rate | | 1.875% | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from issuance of debt, net of discounts and associated financing costs | | $ 621,200,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt issued | | 625,000,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Differed financing costs | | 3,800,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Notes Payable | 2.625% U.S. Dollar-denominated Notes Due September 4, 2050 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt interest rate | | | | | | | | 2.625% | | | | | | | | | | | | | | | | | | | | | |
Debt issued | | | | | | | | $ 500,000,000 | | | | | | | | | | | | | | | | | | | | | |
Notes Payable | 2.625% U.S. Dollar-denominated Notes Due September 4, 2050 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from issuance of debt, net of discounts and associated financing costs | | | | | | | | | | | | | | | | | | | $ 1,093,800,000 | | | | | | | | | | |
Debt issued | | $ 625,000,000 | | | | | | | | | | | | | | | | | 1,130,000,000 | | | | | | | | | | |
Differed financing costs | | | | | | | | | | | | | | | | | | | $ 31,200,000 | | | | | | | | | | |
Notes Payable | 0.625% Swiss Franc-denominated Notes Due October 6, 2020 | Subsequent Event | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Repayment of debt | | | $ 147,000,000 | SFr 135 | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt interest rate | | | 0.625% | 0.625% | | | | | | | | | | | | | | | | | | | | | | | | | |
Notes Payable | Euro-denominated Notes Guaranteed by Mondelez International, Inc. Due September 23, 2026 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt interest rate | | | | | | 0.00% | | | | | | | | | | | | | | | | | | | 0.00% | | | | |
Debt issued | € | | | | | | | | | | | | | | | | | | | | | | | | | € 500,000,000 | | | | |
Notes Payable | Euro-denominated Notes Guaranteed by Mondelez International Inc. Due September 23, 2029 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt interest rate | | | | | | 0.375% | | | | | | | | | | | | | | | | | | | 0.375% | | | | |
Debt issued | € | | | | | | | | | | | | | | | | | | | | | | | | | € 750,000,000 | | | | |
Notes Payable | 1.500% U.S. Dollar-denominated Notes Due February 4, 2031 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt interest rate | | | | | | | | 1.50% | | | | | | | | | | | | | | | | | | | | | |
Proceeds from issuance of debt, net of discounts and associated financing costs | | | | | | | | $ 494,800,000 | | | | | | | | | | | | | | | | | | | | | |
Debt issued | | | | | | | | 500,000,000 | | | | | | | | | | | | | | | | | | | | | |
Differed financing costs | | | | | | | | $ 5,200,000 | | | | | | | | | | | | | | | | | | | | | |
Notes Payable | 0.625% U.S. Dollar-denominated Notes Due July 1, 2022 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt interest rate | | | | | | | | | 0.625% | | | | | | | | | | | | | | | | | | | | |
Proceeds from issuance of debt, net of discounts and associated financing costs | | | | | | | | | $ 998,100,000 | | | | | | | | | | | | | | | | | | | | |
Debt issued | | | | | | | | | 1,000,000,000 | | | | | | | | | | | | | | | | | | | | |
Differed financing costs | | | | | | | | | $ 1,900,000 | | | | | | | | | | | | | | | | | | | | |
Notes Payable | 3.000% U.S. Dollar-denominated Notes Due May 7, 2020 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Repayment of debt | | | | | | | | | | $ 750,000,000 | | | | | | | | | | | | | | | | | | | |
Debt interest rate | | | | | | | | | | 3.00% | | | | | | | | | | | | | | | | | | | |
Notes Payable | 1.500% U.S. Dollar-denominated Notes Due May 4, 2025 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | 1.50% | | | | | | | | | | | | | | | | | | |
Proceeds from issuance of debt, net of discounts and associated financing costs | | | | | | | | | | | $ 743,900,000 | | | | | | | | | | | | | | | | | | |
Debt issued | | | | | | | | | | | 750,000,000 | | | | | | | | | | | | | | | | | | |
Differed financing costs | | | | | | | | | | | 6,100,000 | | | | | | | | | | | | | | | | | | |
Notes Payable | 2.750% U.S. Dollar-denominated Notes Due April 13, 2030 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | 2.75% | | | | | | | | | | | | | | | | | |
Proceeds from issuance of debt, net of discounts and associated financing costs | | | | | | | | | | | 1,283,900,000 | | | | | | | | | | | | | | | | | | |
Debt issued | | | | | | | | | | | 750,000,000 | $ 500,000,000 | | | | | | | | | | | | | | $ 1,250,000,000 | | | |
Differed financing costs | | | | | | | | | | | $ 33,900,000 | | | | | | | | | | | | | | | | | | |
Notes Payable | 2.125% U.S. Dollar-denominated Notes Due April 13, 2023 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | 2.125% | | | | | | | | | | | | | | | | | |
Proceeds from issuance of debt, net of discounts and associated financing costs | | | | | | | | | | | | $ 497,800,000 | | | | | | | | | | | | | | | | | |
Debt issued | | | | | | | | | | | | 500,000,000 | | | | | | | | | | | | | | | | | |
Differed financing costs | | | | | | | | | | | | $ 2,200,000 | | | | | | | | | | | | | | | | | |
Notes Payable | 0.050% Swiss Franc Notes Due March 30, 2020 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Repayment of debt | | | | | | | | | | | | | $ 235,000,000 | SFr 225 | | | | | | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | 0.05% | 0.05% | | | | | | | | | | | | | | | |
Notes Payable | 5.375% U.S. Dollar-denominated Notes Due February 10, 2020 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Repayment of debt | | | | | | | | | | | | | | | | | | $ 427,000,000 | | | | | | | | | | | |
Debt interest rate | | | | | | | | | | | | | | | | | | 5.375% | | | | | | | | | | | |
Commercial paper | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Short-term borrowings | | | | | | | | | | | | | | | | | | | | | 139,000,000 | | 139,000,000 | | | | | 2,581,000,000 | |
Line of Credit | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Short-term borrowings | | | | | | | | | | | | | | | | | | | | | 60,000,000 | | 60,000,000 | | | | | 57,000,000 | |
Line of Credit | Credit facility borrowings | 364-day Senior Unsecured Credit Facility Expiring March 23, 2021 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Credit facility, maximum borrowing capacity | | | | | | | | | | | | | | | $ 1,750,000,000 | | | | | | | | | | | | $ 1,950,000,000 | | |
Credit facility expiration period | | | | | | | | | | | | | | | 364 days | | | | | | | | | | | | | | |
Line of Credit | Credit facility borrowings | 364-day Senior Unsecured Credit Facility Expiring March 5, 2021 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Credit facility, maximum borrowing capacity | | | | | | | | | | | | | | | | $ 2,500,000,000 | | | | | | | | | | | | | |
Credit facility expiration period | | | | | | | | | | | | | | | | 364 days | | | | | | | | | | | | | |
Line of Credit | Credit facility borrowings | 364-day Senior Unsecured Credit Facility Expiring February 24, 2021 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Credit facility, maximum borrowing capacity | | | | | | | | | | | | | | | | | $ 1,500,000,000 | | | | | | | | | | | | |
Credit facility expiration period | | | | | | | | | | | | | | | | | 364 days | | | | | | | | | | | | |
Amounts drawn on the revolving credit agreement | | | | | | | | | | | | | | | | | | | | | 0 | | $ 0 | | | | | | |
Minimum | Commercial paper | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Commercial paper, maturity period | | | | | | | | | | | | | | | | | | | | | | | 1 day | | | | | | |
Maximum | Commercial paper | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Commercial paper, maturity period | | | | | | | | | | | | | | | | | | | | | | | 62 days | | | | | | |
Net investment hedge derivative contracts | Net investment hedge debt | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Net investment hedge derivative contracts excluded from hedge effectiveness | [1] | | | | | | | | | | | | | | | | | | | | 28,000,000 | $ 34,000,000 | $ 92,000,000 | $ 101,000,000 | | | | | |
International Subsidiaries | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Credit facility, maximum borrowing capacity | | | | | | | | | | | | | | | | | | | | | $ 1,500,000,000 | | $ 1,500,000,000 | | | | | $ 1,700,000,000 | |
MIHN | Notes Payable | Term Loan | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Repayment of debt | | | | | $ 750,000,000 | | | | | | | | | | | | | | | | | | | | | | | | |
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[1] | We elected to record changes in the fair value of amounts excluded from the assessment of effectiveness in net earnings within interest and other expense, net. | |