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Stock Compensation Plans - Stock-Based Compensation Expense and Related Tax Benefits (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 01, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | $ 17 | $ 9 | $ 50 | $ 30
Less: Tax benefit |  | (3) | (2) | (10) | (5)
Total stock-based compensation expense, after tax |  | 14 | 7 | 40 | 25
Nutrition & Biosciences, Inc |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense |  |  |  | $ 4 |
Shares issued as part of merger consideration (shares) | 141,740,461 |  |  |  |
Equity issued in business combination, fair value | $ 25 |  |  |  |
Post-combination service period |  |  |  | 3 years |
Nutrition & Biosciences, Inc | Share-based Payment Arrangement, Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued as part of merger consideration (shares) | 335,347 |  |  |  |
Nutrition & Biosciences, Inc | Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued as part of merger consideration (shares) | 258,572 |  |  |  |
Nutrition & Biosciences, Inc | Stock Appreciation Rights (SARs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued as part of merger consideration (shares) | 5,816 |  |  |  |
Equity-based awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | 17 | 8 | $ 44 | 27
Liability-based awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | $ 0 | $ 1 | $ 6 | $ 3

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