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Stock-Based Compensation RSU and PSU (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 30, 2017 | Aug. 31, 2017 | Dec. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
RSU and PSU Award Vesting Period |  | 3 years |  |  |  |  |
Conversion Ratio - DuPont RSUs to DowDuPont Common Stock |  | 1 |  |  |  |  |
RSU Requisite Service Period |  | 6 months |  |  |  |  |
Performance Deferred Stock Units [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
PSU, percentage of performance target |  | 0.00% |  |  |  |  |
Performance Deferred Stock Units [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
PSU, percentage of performance target |  | 200.00% |  |  |  |  |
Management [Member] | Restricted Stock Units (RSUs) [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
RSU and PSU Award Vesting Period |  | 2 years |  |  |  |  |
Management [Member] | Restricted Stock Units (RSUs) [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
RSU and PSU Award Vesting Period |  | 5 years |  |  |  |  |
Successor [Member] | Performance Deferred Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value, Granted during Period | $ 71.16 |  |  |  |  |  |
Successor [Member] | Performance Deferred Stock Units [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
PSU, percentage of performance target | 0.00% |  |  |  |  |  |
Successor [Member] | Performance Deferred Stock Units [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
PSU, percentage of performance target | 200.00% |  |  |  |  |  |
Successor [Member] | Restricted Stock Units and Performance Deferred Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value, Granted during Period |  |  | $ 70.02 |  |  |  |
Fair value of stock units vested |  |  | $ 9 |  |  |  |
Unrecognized Pretax Compensation Expense Related to RSUs |  |  | $ 113 |  | $ 113 |  |
Remaining Weighted-Average Recognition Period |  |  |  |  | 1 year 266 days |  |
Predecessor [Member] | Performance Deferred Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value, Granted during Period |  |  |  | $ 91.56 |  |  |
Predecessor [Member] | Restricted Stock Units and Performance Deferred Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value, Granted during Period |  |  |  | $ 76.41 |  | $ 59.50 | $ 71.66
Fair value of stock units vested |  |  |  | $ 84 |  | $ 83 | $ 64

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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