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Restructuring and Asset Related Charges DowDuPont Cost Synergy Program (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 28 Months Ended | 40 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | [1] | Jun. 30, 2020 | [1] | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | [1] | Jun. 30, 2019 | [1] | Mar. 31, 2019 | [1] | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and asset related charges- net |  | $ 37 | [1] | $ 49 | $ 179 | $ 70 | [1] | $ 55 | [1] | $ 46 | $ 60 | $ 61 | $ 335 | $ 222 | $ 694 |  |
Asset Related Charges [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and asset related charges- net |  |  |  |  |  |  |  |  |  |  |  |  | 176 |  |  |  |
DowDuPont Cost Synergy Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and asset related charges- net |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Restructuring Reserve, Beginning Balance |  |  |  |  |  | 69 |  |  |  |  |  |  | 69 |  |  |  |
Payments for Restructuring |  |  |  |  |  |  |  |  |  |  |  |  | (27) |  |  |  |
Asset write-offs |  |  |  |  |  |  |  |  |  |  |  |  | (7) |  |  |  |
Restructuring Reserve, Ending Balance |  | 38 |  |  |  |  |  | 69 |  |  |  |  | 38 | 69 |  | $ 69 | $ 38
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 92 | 484 |  | 845
DowDuPont Cost Synergy Program [Member] | Employee Severance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and asset related charges- net |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |  |  |
Restructuring Reserve, Beginning Balance |  |  |  |  |  | 29 |  |  |  |  |  |  | 29 |  |  |  |
Payments for Restructuring |  |  |  |  |  |  |  |  |  |  |  |  | (19) |  |  |  |
Asset write-offs |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Restructuring Reserve, Ending Balance |  | 8 |  |  |  |  |  | 29 |  |  |  |  | 8 | 29 |  | 29 | 8
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  | (2) | (7) | 191 | 317 |
DowDuPont Cost Synergy Program [Member] | Costs Related To Contract Termination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and asset related charges- net | [2] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Restructuring Reserve, Beginning Balance | [2] |  |  |  |  | 40 |  |  |  |  |  |  | 40 |  |  |  |
Payments for Restructuring | [2] |  |  |  |  |  |  |  |  |  |  |  | (10) |  |  |  |
Asset write-offs | [2] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Restructuring Reserve, Ending Balance | [2] | 30 |  |  |  |  |  | 40 |  |  |  |  | 30 | 40 |  | 40 | 30
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 69 | 84 | 193 |
DowDuPont Cost Synergy Program [Member] | Asset Related Charges [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and asset related charges- net |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Restructuring Reserve, Beginning Balance |  |  |  |  |  | $ 0 |  |  |  |  |  |  | 0 |  |  |  |
Payments for Restructuring |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Asset write-offs |  |  |  |  |  |  |  |  |  |  |  |  | (7) |  |  |  |
Restructuring Reserve, Ending Balance |  | $ 0 |  |  |  |  |  | $ 0 |  |  |  |  | 0 | 0 |  | 0 | $ 0
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 30 | 209 | $ 335 |
DowDuPont Cost Synergy Program [Member] | Seed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  | (9) | 66 | 237 |  |
DowDuPont Cost Synergy Program [Member] | Crop Protection [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  | 11 | 27 | 57 |  |
DowDuPont Cost Synergy Program [Member] | Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  | $ (2) | $ (1) | $ 190 |  |
[1] | See Note 2 - Summary of Significant Accounting Polices, Note 7 - Restructuring and Asset Related Charges - Net, Note 5 - Divestitures and Other Transactions, and Note 15 - Goodwill and Other Intangible Assets, to the Consolidated Financial Statements for additional information related to integration and separation costs, restructuring and asset related charges - net, and discontinued operations, respectively.
[2] | Relates primarily to contract terminations charges.

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