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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions |  | 1 Months Ended
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Aug. 31, 2017 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Amortized to Stock Compensation Expense | $ 144 |
Equity and Incentive Plan [Member] | Deferred Compensation, Share-based Payments [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Incremental Expense | 23 |
Successor | Equity and Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized Pre-tax Compensation Expense Relate to Stock Options |  | $ 24
Successor | Equity and Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized Pre-tax Compensation Expense Relate to RSUs |  | $ 110
Weighted-Average Recognition Period |  | 1 year 332 days
Successor | Equity and Incentive Plan [Member] | Employee Stock Option [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Weighted-Average Recognition Period |  | 1 year 292 days
Merger with Dow [Domain] | Equity and Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Fair value of DuPont Equity Awards | 629 |
Amortized to Stock Compensation Expense | $ 144 |
Merger with Dow [Domain] | Common Stock [Member] | Equity and Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
DuPont to DowDuPont share exchange ratio | 1.2820 |
Merger with Dow [Domain] | Equity Awards [Member] | Equity and Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Fair Value of DuPont Equity Awards, Consideration exchanged | $ 485 |

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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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