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Commitments and Contingencies - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 11, 2020 | Oct. 29, 2019 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 28, 2021 | Feb. 01, 2021 | Sep. 16, 2020
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Bank guarantees related to appeals on income tax and indirect tax cases |  |  |  |  |  |  | $ 14,000,000 |  |  |  |  |
Available lines of credit |  |  |  |  |  |  | 1,428,000,000 |  |  |  |  |
Property, Plant and Equipment, Net |  |  |  |  |  |  | 4,295,000,000 | $ 1,458,000,000 |  |  |  |
Bank guarantees and pledged assets to pursue defenses related to other contingencies |  |  |  |  |  |  | 21,000,000 |  |  |  |  |
Line of Credit Facility, Current Borrowing Amount/Total Amount Drawn Down |  |  |  |  |  |  | 229,000,000 |  |  |  |  |
Commercial Guarantees, Amount Outstanding |  |  |  |  |  |  | 84,000,000 |  |  |  |  |
Bank Guarantees and Standby Letters of Credit, Amount Outstanding |  |  |  |  |  |  | 25,000,000 |  |  |  |  |
Pharma Solutions |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recall costs accrued |  |  |  |  |  |  | 35,000,000 |  |  |  |  |
Pledged assets |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
The amount of pledged assets, principally PP&E to cover income tax and indirect tax assessments |  |  |  |  |  |  | 7,000,000 |  |  |  |  |
Bank Guarantees, Commercial Guarantees, Standby Letters Of Credit and Surety Bonds |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Bank Guarantees, Commercial Guarantees, Letters Of Credit and Surety Bonds Outstanding |  |  |  |  |  |  | 381,000,000 |  |  |  |  |
Zhejiang Ingredients Plant |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain Contingency, Expected Relocation Payments |  |  | $ 13,000,000 |  |  | $ 50,000,000 |  |  |  |  |  |
Gain Contingency, Relocation Payments Received |  |  |  |  |  |  |  |  | $ 30,000,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimation of possible loss |  |  |  |  |  |  | 0 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimation of possible loss |  |  |  |  |  |  | 57,000,000 |  |  |  |  |
Amended credit facility | Citibank, N.A. |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | 1,718,000,000 |  |  | $ 2,000,000,000 |  |
CHINA |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  |  |  |  |  | 284,000,000 |  |  |  |  |
CHINA | Guangzhou Flavors Plant |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  |  |  |  |  | 60,000,000 |  |  |  |  |
CHINA | Guangzhou Fragrance Plant |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  |  |  |  |  | $ 9,000,000 |  |  |  |  |
Nutrition & Biosciences, Inc | Senior Unsecured Term Loan Facilities | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  | $ 1,250,000,000 |
Nutrition & Biosciences, Inc | Senior Unsecured Notes | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  | $ 6,250,000,000 | $ 6,250,000,000
BRAZIL | Foreign Tax Authority |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Income Tax Refunds |  |  |  | $ 4,000,000 | $ 8,000,000 |  |  |  |  |  |  |
BRAZIL | Foreign Tax Authority | BRAZIL |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Income Tax Refunds |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |
Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense | $ 20,000,000 | $ 20,000,000 |  |  |  |  |  |  |  |  |  |

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