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Acquisitions and Divestitures - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
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Jan. 04, 2021 | Apr. 01, 2020 | Jul. 16, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2020 | Jul. 16, 2020 | Dec. 31, 2019 | Jun. 07, 2019 | Dec. 31, 2018 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration, net of cash received |  |  |  |  |  | $ 1,136,000,000 |  | $ 284,000,000 |  | $ 528,000,000 |  |  |
Acquisition-related costs |  |  |  |  |  | 15,000,000 |  | 3,000,000 |  | 13,000,000 |  |  |
Goodwill |  |  |  |  |  | 21,895,000,000 |  | 20,848,000,000 |  | $ 20,725,000,000 |  |  |
North America |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 9,901,000,000 |  | 9,356,000,000 |  |  |  |  |
AMEA |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 3,250,000,000 |  | 3,151,000,000 |  |  |  |  |
AMEA | Cheese Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  |  |  |  |  |  | 161,000,000 |  |  |  |  |
Current assets divested |  |  |  |  |  |  |  | 19,000,000 |  |  |  |  |
Non-current assets divested |  |  |  |  |  |  |  | 96,000,000 |  |  |  |  |
Net pre-tax gain on divestiture |  |  |  |  |  |  |  | 44,000,000 |  |  |  |  |
Decline in year-over-year net revenues due to business divestiture |  |  |  |  |  | 55,000,000 |  |  |  |  |  |  |
Decline in year-over-year net operating income due to business divestiture |  |  |  |  |  | 9,000,000 |  |  |  |  |  |  |
Divestiture-related costs |  |  |  |  |  | 4,000,000 |  | $ 6,000,000 |  |  |  |  |
Hu Master Holdings | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired | 93.00% |  |  |  |  |  |  |  |  |  |  |  |
Closing cash consideration | $ 231,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Give & Go |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration, net of cash received |  | $ 1,136,000,000 |  |  |  |  |  |  |  |  |  |  |
Incremental net revenues from acquisition |  |  |  |  |  | 390,000,000 |  |  |  |  |  |  |
Incremental operating income from acquisition |  |  |  |  |  | 24,000,000 |  |  |  |  |  |  |
Acquisition-related costs |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |
Definite-life intangible assets |  | 511,000,000 |  |  |  |  |  |  |  |  |  |  |
Indefinite-life intangible assets |  | 42,000,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 531,000,000 |  |  |  |  |  |  |  |  | $ 531,000,000 |  |
Property, plant and equipment |  | 136,000,000 |  |  |  |  |  |  |  |  |  |  |
Inventory |  | 38,000,000 |  |  |  |  |  |  |  |  |  |  |
Accounts receivables |  | 29,000,000 |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  | 41,000,000 |  |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  | 92,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-term other liabilities |  | 19,000,000 |  |  |  |  |  |  |  |  |  |  |
Give & Go | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Definite-lived intangible assets acquired |  | $ 416,000,000 |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of definite-lived intangible assets acquired |  | 17 years |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be deductible for income tax purposes |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Perfect Snacks |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000
Perfect Snacks | North America |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration, net of cash received |  |  | $ 284,000,000 |  |  |  |  |  |  |  |  |  |
Incremental net revenues from acquisition |  |  |  |  |  |  | $ 55,000,000 |  |  |  |  |  |
Definite-life intangible assets |  |  |  |  |  |  |  |  |  |  |  | $ 31,000,000 |
Indefinite-life intangible assets |  |  |  |  |  |  |  |  |  |  |  | 107,000,000 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |
Inventory |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |
Accounts receivables |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  | 13,000,000 |
Deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |
Long-term other liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000 |
Tate’s Bake Shop | North America |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration, net of cash received |  |  |  | $ 527,000,000 | $ 528,000,000 |  |  |  |  |  |  |  |
Incremental net revenues from acquisition |  |  |  |  |  |  |  |  | $ 35,000,000 |  |  |  |
Definite-life intangible assets |  |  |  | 45,000,000 |  |  |  |  |  |  |  |  |
Indefinite-life intangible assets |  |  |  | 205,000,000 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 297,000,000 |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | 16,000,000 |  |  |  |  |  |  |  |  |
Inventory |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |
Accounts receivables |  |  |  | 9,000,000 |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  |  |  | $ 43,000,000 |  |  |  |  |  |  |  |  |

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