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Acquisitions - Narrative (Details) - USD ($) |  | 3 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 16, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 5,427,482,000 |  |  |  | $ 5,497,596,000 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | $ 6,209,987,000 |  | $ 6,090,315,000 |  | $ 6,000,916,000 |  | $ 6,229,548,000 | $ 6,066,988,000 | $ 6,043,374,000
Nutrition & Biosciences, Inc |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Share Price | $ 0.125 |  |  |  |  |  |  |  |  |
Payments to acquire businesses | $ 7,300,000,000 |  |  |  |  |  |  |  |  |
Wiburg Canada |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  | 50.00% |  |  |  |  |  |  |  |
Payments to acquire businesses |  | $ 37,000,000 |  |  |  |  |  |  |  |
Goodwill, expected tax deductible amount |  | 30,000,000 |  |  |  |  |  |  |  |
Intangible assets acquired |  | $ (20,000,000) |  |  |  |  |  |  |  |
Mighty and Leagel |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  |  | 70.00% |  |  |  |  |  |  |
Payments to acquire businesses |  |  | $ 52,000,000 |  |  |  |  |  |  |
Goodwill, expected tax deductible amount |  |  | 47,000,000 |  |  |  |  |  |  |
Intangible assets acquired |  |  | (28,000,000) |  |  |  |  |  |  |
Contingent consideration, liability |  |  | $ 19,000,000 |  |  |  |  |  |  |
Minimum | Mighty and Leagel |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  |  | 49.00% |  |  |  |  |  |  |
Maximum | Mighty and Leagel |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  |  | 60.00% |  |  |  |  |  |  |
Frutarom | Wiburg Canada |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  | 100.00% |  |  |  |  |  |  |  |
International Flavors & Fragrances Inc | DuPont de Nemours, Inc | Nutrition & Biosciences, Inc |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired | 55.40% |  |  |  |  |  |  |  |  |
Unsecured Debt | Senior Unsecured Bridge Term Loan | Nutrition & Biosciences, Inc |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 7,500,000,000 |  |  |  |  |  |  |  |  |
Unsecured Debt | Senior Unsecured Term Loan Facilities | Nutrition & Biosciences, Inc |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 1,250,000,000 |  |  |  |  |  |  |  |  |
Unsecured Debt | Senior Unsecured Notes | Nutrition & Biosciences, Inc |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 6,250,000,000 |  |  |  |  |
Measurement period adjustments | 2019 Acquisitions |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 15,000,000 |  |  |
Intangible assets acquired |  |  |  |  |  |  | 5,000,000 |  |  |
Deferred tax liabilities |  |  |  |  |  |  | (3,000,000) |  |  |
Fixed assets increase |  |  |  |  |  |  | $ 13,000,000 |  |  |

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