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Summary of Significant Accounting Policies (Policies) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Principles of Consolidation and Basis of Presentation | Interim Financial Statements The accompanying unaudited interim Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") for interim financial information and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair statement of the results for interim periods have been included. Results for interim periods should not be considered indicative of results for a full year. These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto contained in the company’s Annual Report on Form 10-K for the year ended December 31, 2017, collectively referred to as the “2017 Annual Report”. The interim Consolidated Financial Statements include the accounts of the company and all of its subsidiaries in which a controlling interest is maintained.
Pushdown Accounting [Policy Text Block] | Principles of Consolidation and Basis of Presentation DowDuPont Inc. ("DowDuPont") was formed on December 9, 2015 to effect an all-stock, merger of equals strategic combination between The Dow Chemical Company ("Dow") and DuPont (the "Merger Transaction"). On August 31, 2017 at 11:59 pm ET, (the "Merger Effectiveness Time") pursuant to the Agreement and Plan of Merger, dated as of December 11, 2015, as amended on March 31, 2017 (the "Merger Agreement"), Dow and DuPont each merged with wholly owned subsidiaries of DowDuPont ("Mergers") and, as a result of the Mergers, Dow and DuPont became subsidiaries of DowDuPont (collectively, the "Merger"). Prior to the Merger, DowDuPont did not conduct any business activities other than those required for its formation and matters contemplated by the Merger Agreement. DowDuPont intends to pursue, subject to certain customary conditions, including, among others, the effectiveness of registration statements filed with the Securities and Exchange Commission and approval by the Board of Directors of DowDuPont, the separation of the combined company's agriculture business, specialty products business and materials science business through a series of tax-efficient transactions (collectively, the "Intended Business Separations"). For purposes of DowDuPont's financial statement presentation, Dow was determined to be the accounting acquirer in the Merger and DuPont's assets and liabilities are reflected at fair value as of the Merger Effectiveness Time. In connection with the Merger and the related accounting determination, DuPont has elected to apply push-down accounting and reflect in its financial statements the fair value of its assets and liabilities. DuPont's interim Consolidated Financial Statements for periods following the close of the Merger are labeled “Successor” and reflect DowDuPont’s basis in the fair values of the assets and liabilities of DuPont. All periods prior to the closing of the Merger reflect the historical accounting basis in DuPont's assets and liabilities and are labeled “Predecessor.” The interim Consolidated Financial Statements and footnotes include a black line division between the columns titled "Predecessor" and "Successor" to signify that the amounts shown for the periods prior to and following the Merger are not comparable. See Note 3 for additional information on the Merger. Transactions between DuPont and DowDuPont, Dow and their affiliates and other associated companies are reflected in the Successor consolidated financial statements and disclosed as related party transactions when material. Related party transactions with Dow and DowDuPont are included in Note 7.
Discontinued Operations, Policy [Policy Text Block] | As a condition of the regulatory approval for the Merger Transaction, the company was required to divest certain assets related to its crop protection business and research and development ("R&D") organization, specifically the company’s Cereal Broadleaf Herbicides and Chewing Insecticides portfolios, including Rynaxypyr®, Cyazypyr® and Indoxacarb as well as the crop protection R&D pipeline and organization, excluding seed treatment, nematicides, and late-stage R&D programs. On March 31, 2017, the company entered into a definitive agreement (the "FMC Transaction Agreement") with FMC Corporation ("FMC"). Under the FMC Transaction Agreement, FMC would acquire the crop protection business and R&D assets that DuPont was required to divest in order to obtain European Commission ("EC") approval of the Merger Transaction as described above, (the "Divested Ag Business") and DuPont agreed to acquire certain assets relating to FMC’s Health and Nutrition segment, excluding its Omega-3 products (the "H&N Business") (collectively, the "FMC Transactions"). On November 1, 2017, the company completed the FMC Transactions through the disposition of the Divested Ag Business and the acquisition of the H&N Business. The sale of the Divested Ag Business meets the criteria for discontinued operations and as such, results of operations are presented as discontinued operations and have been excluded from continuing operations for all periods presented. The sum of the individual earnings per share amounts from continuing operations and discontinued operations may not equal the total company earnings per share amounts due to rounding. The comprehensive income and cash flows related to the Divested Ag Business have not been segregated and are included in the interim Consolidated Statements of Comprehensive Income and interim Condensed Consolidated Statements of Cash Flows, respectively, for all periods presented. Amounts related to the Divested Ag Business are consistently included or excluded from the Notes to the interim Consolidated Financial Statements based on the respective financial statement line item. See Note 4 for additional information.
Reclassification, Policy [Policy Text Block] | Changes in Accounting and Reporting Within the Successor periods, DuPont made the following changes in accounting and reporting to harmonize its accounting and reporting with DowDuPont. Within the Successor periods of the interim Consolidated Income Statements:
• | Included royalty income within net sales. In the Predecessor periods, royalty income is included within sundry income (expense) - net.
• | Eliminated the other operating charges line item. In the Successor periods, a majority of these costs are included within cost of goods sold. These costs are also included in selling, general and administrative expenses and amortization of intangibles in the Successor periods.
• | Presented amortization of intangibles as a separate line item. In the Predecessor periods, amortization is included within selling, general and administrative expenses, other operating charges, and research and development expenses.
• | Presented integration and separation costs as a separate line item. In the Predecessor periods, these costs are included within selling, general and administrative expenses.
• | Included interest accrued related to unrecognized tax benefits within the provision for income taxes on continuing operations. In the Predecessor periods, interest accrued related to unrecognized tax benefits is included within sundry income (expense) - net.
Within the Successor period of the interim Condensed Consolidated Statements of Cash Flows:
• | Included foreign currency exchange contract settlements within cash flows from operating activities, regardless of hedge accounting qualification. In the Predecessor period, DuPont reflected non-qualified hedge programs, specifically forward contracts, options and cash collateral activity, within cash flows from investing activities. In the Predecessor period, DuPont reflected cash flows from qualified hedge programs within the line item to which the program related (i.e., revenue hedge cash flows presented within changes from accounts receivable).
Certain reclassifications of prior year's data have been made to conform to current year's presentation. As described in Note 2, effective January 1, 2018, the company adopted Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") No. 2017-07, Compensation - Retirement Benefits (Topic 715), Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. In conjunction with the adoption of this ASU, the company retrospectively reclassified the non-service components of net periodic benefit cost in the interim Consolidated Income Statements. See Note 2
Revenue Recognition, Policy [Policy Text Block] | Revenue The company recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration which the company expects to receive in exchange for those goods or services. To determine revenue recognition for the arrangements that the company determines are within the scope of Topic 606, the company performs the following five steps: (1) identify the contract(s) with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when (or as) the entity satisfies a performance obligation. See Note 5 for additional information on revenue recognition.

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- Definition Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References No definition available. + Details
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- Definition Disclosure of accounting policy by the acquiree for election of option to apply pushdown accounting when a change-in-control event has occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=66013424&loc=SL58715852-205896 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66013424&loc=SL58715849-205896 + Details
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- Definition Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.B.Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18726-107790 + Details
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