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Restructuring and Asset Related Charges DowDuPont Cost Synergy Program (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 25 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  | $ 46 | $ 235 | $ 167 |  | $ 466 |
DowDuPont Cost Synergy Program [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Beginning Balance |  |  |  | 215 |  |  |
Restructuring and Asset Related Charges - Net |  | (8) | 109 | 114 |  | 340 | $ 866
Payments for Restructuring |  |  |  | (191) |  |  |
Asset write-offs and adjustments |  |  |  | (30) |  |  |
Restructuring Reserve, Ending Balance |  | 108 |  | 108 |  |  | 108
Employee Severance [Member] | DowDuPont Cost Synergy Program [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Beginning Balance |  |  |  | 154 |  |  |
Restructuring and Asset Related Charges - Net |  | 0 | 20 | 14 |  | 157 | 340
Payments for Restructuring |  |  |  | (101) |  |  |
Asset write-offs and adjustments |  |  |  | 0 |  |  |
Restructuring Reserve, Ending Balance |  | 67 |  | 67 |  |  | 67
Contract Termination Charges | DowDuPont Cost Synergy Program [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Beginning Balance | [1] |  |  | 61 |  |  |
Restructuring and Asset Related Charges - Net |  | 0 | 9 | 69 | [1] | 46 | 193
Payments for Restructuring | [1] |  |  | (89) |  |  |
Asset write-offs and adjustments | [1] |  |  | 0 |  |  |
Restructuring Reserve, Ending Balance | [1] | 41 |  | 41 |  |  | 41
Asset Related Charges [Member] | DowDuPont Cost Synergy Program [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Beginning Balance |  |  |  | 0 |  |  |
Restructuring and Asset Related Charges - Net |  | (8) | 80 | 31 |  | 137 | 333
Payments for Restructuring |  |  |  | (1) |  |  |
Asset write-offs and adjustments |  |  |  | (30) |  |  |
Restructuring Reserve, Ending Balance |  | 0 |  | 0 |  |  | $ 0
Seed [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  | (47) | (190) | (123) |  | (273) |
Seed [Member] | DowDuPont Cost Synergy Program [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  | (7) | 64 | 66 |  | 147 |
Crop Protection [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  | 1 | (30) | (24) |  | (42) |
Crop Protection [Member] | DowDuPont Cost Synergy Program [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  | (1) | 30 | 28 |  | 42 |
Corporate |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  |  | (15) | (20) |  | (151) |
Corporate | DowDuPont Cost Synergy Program [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  | $ 0 | $ 15 | $ 20 |  | $ 151 |
[1] | Relates primarily to contract terminations charges.

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