| Significant Accounting Policies [Text Block] | Summary of Significant Accounting Policies Principles of Consolidation— The Consolidated Financial Statements include the accounts of the Company and its majority-owned subsidiaries in which minority shareholders hold no substantive participating rights. Intercompany accounts and transactions are eliminated in consolidation. The Company’s share of the net earnings of 20% to 50% owned companies, which are accounted for under the equity method of accounting as the Company has the ability to exercise significance influence over operating and financial policies (but not control), are included in “Earnings from unconsolidated entities, net of taxes” in the Consolidated Statements of Operations. Investments in the other companies are carried at cost. The Company has recorded a noncontrolling interest for the equity interests in consolidated subsidiaries that are not 100% owned. The Company’s unconsolidated investments accounted for under the equity method of accounting include the following as of December 31, 2020: • 49.99% interest in Momentive UV Coatings (Shanghai) Co., Ltd, a joint venture that manufactures UV-curable coatings and adhesives in China; • 50% ownership interest in Hexion Shchekinoazot Holding B.V., a joint venture that manufactures forest products resins in Russia (see Note 4 for discussion of Russia JV within discontinued operations); • 50% ownership interest in Hexion Australia Pty Ltd, a joint venture which provides urea formaldehyde resins and other products to industrial customers in western Australia. Foreign Currency Translations and Transactions —Assets and liabilities of foreign affiliates are translated at the exchange rates in effect at the balance sheet date. Income, expenses and cash flows are translated at average exchange rates during the year. The Company did not recognize a transaction gain or loss for the year ended December 31, 2020. The Company recognized transaction gains (losses) of $5, $(8) and $30 for the Successor period July 2, 2019 through December 31, 2019, the Predecessor periods January 1, 2019 through July 1, 2019 and the year ended December 31, 2018, respectively, which are included as a component of “Net (loss) income.” In addition, gains or losses related to the Company’s intercompany loans payable and receivable denominated in a foreign currency other than the subsidiary’s functional currency that are deemed to be permanently invested are remeasured to cumulative translation and recorded in “Accumulated other comprehensive loss” in the Consolidated Balance Sheets. The effect of translation is included in “Accumulated other comprehensive loss.” Use of Estimates —The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and also the disclosure of contingent assets and liabilities at the date of the financial statements. In addition, it requires management to make estimates and assumptions that affect the reported amounts of revenues and expenses during the reporting period. The most significant estimates that are included in the financial statements are environmental remediation liabilities, legal liabilities, deferred tax assets and liabilities and related valuation allowances, income tax accruals, pension and postretirement assets and liabilities, reserves for uncollectible accounts receivable, general insurance liabilities, asset impairments, fair values of assets acquired and liabilities assumed in business acquisitions, and valuations associated with fresh start accounting. Actual results could differ from these estimates. Cash and Cash Equivalents —The Company considers all highly liquid investments that are purchased with an original maturity of three months or less to be cash equivalents. At December 31, 2020 and 2019, the Company had interest-bearing time deposits and other cash equivalent investments of $20 and $74, respectively. The Company’s restricted cash balances of $4 as of both December 31, 2020 and 2019, respectively represent deposits to secure certain bank guarantees issued to third parties to guarantee potential obligations of the Company primarily related to the completion of tax audits. These balances will remain restricted as long as the underlying exposures exist and are included in the Consolidated Balance Sheets as a component of “Cash and cash equivalents.” Allowance for Doubtful Accounts — Under adoption of ASU 2016-13, the Company has updated its credit loss methodology to consider a broader range of reasonable and supportable information to determine its credit loss estimates. The Company utilizes a historical aging method disaggregated by portfolio segment of geographic region, and then the Company makes any necessary adjustments for current conditions and forecasts about future economic conditions for calculating its allowance for doubtful accounts. The Company evaluates each pooled receivables’ geographic region by differing regional industrial and economic conditions, overall end market conditions and groups of customers with similar risk profiles related to timing and uncertainty of future collections. If particular accounts receivable balances no longer display risk characteristics that are similar to other pooled receivables, the Company performs individual assessments of expected credit losses for those specific receivables. Receivables are charged against the allowance for doubtful accounts when it is probable that the receivable will not be collected. As of December 31, 2020, the Company’s allowance for doubtful accounts provision for expected credit losses reflected the current business conditions, forecasts of future economic conditions and the impacts related to the global business and market disruptions of the coronavirus disease 2019 (“COVID-19”) pandemic, in accordance with ASU 2016-13 (see Note 3 for more information) which did not result in an increase for the year. The Company’s current expectations and assumptions regarding its business, the economy and other future events and conditions are based on currently available financial, economic and competitive data and current business plans as of December 31, 2020. Actual results could vary materially depending on risks and uncertainties that may affect the Company’s operations, markets, services, prices and other factors. The Company recorded an allowance for doubtful accounts of $3 at both December 31, 2020 and 2019, to reduce accounts receivable to their estimated net realizable value. Accounts receivable balances are written-off against the allowance if a final determination of uncollectibility is made. There were no write-offs or recoveries for the year ended December 31, 2020. Prior to adoption of ASU 2016-13, the Company’s policy for the allowance for doubtful accounts was estimated using factors such as customer credit ratings and past collection history. Inventories —Inventories are stated at lower of cost or net realizable value using the first-in, first-out method. Costs include direct material, direct labor and applicable manufacturing overheads, which are based on normal production capacity. Abnormal manufacturing costs are recognized as period costs and fixed manufacturing overheads are allocated based on normal production capacity. Deferred Expenses —Deferred debt financing costs are included in “Long-term debt” in the Consolidated Balance Sheets, with the exception of deferred financing costs related to revolving line of credit arrangements, which are included in “Other long-term assets” in the Consolidated Balance Sheets. These costs are amortized over the life of the related debt or credit facility using the effective interest method. Upon extinguishment of any debt, the related debt issuance costs are written off. Deferred debt financing costs included in “Long-term debt” in the Consolidated Balance Sheets were less than $1 at December 31, 2020. During the year ended December 31, 2019, in connection with the application of fresh start accounting, any existing debt issuance costs were included in “Reorganization items, net” in the Consolidated Statements of Operations and there were no deferred debt financing costs included in “Long-term debt” in the Consolidated Balance Sheets as of December 31, 2019. Property and Equipment —Land, buildings and machinery and equipment are stated at cost less accumulated depreciation. Depreciation is recorded on a straight-line basis over the estimated useful lives of properties (the range of estimated useful lives for buildings and machinery and equipment were 9 to 39 years and 1 to 20 years, respectively at December 31, 2020 and 2019). Assets under finance leases are amortized over the lesser of their useful life or the lease term. Major renewals and betterments are capitalized. Maintenance, repairs and minor renewals are expensed as incurred. When property and equipment is retired or disposed of, the asset and related depreciation are removed from the accounts and any gain or loss is reflected in operating income. The Company capitalizes interest costs that are incurred during the construction of property and equipment. Property and equipment was recorded at its estimated fair value in connection with the application of fresh start accounting, resulting in the remeasurement of accumulated depreciation to zero as of July 1, 2019 (see Note 6. Depreciation expense was $131, $90, $40 and $86 for the year ended December 31, 2020, the Successor period July 2, 2019 through December 31, 2019, the Predecessor period January 1, 2019 through July 1, 2019 and the year ended December 31, 2018, respectively. Additionally, for the year ended December 31, 2020 and 2018, $2 and $4, respectively, of accelerated depreciation was recorded as a result of shortening the estimated useful lives of certain long-lived assets related to planned facility rationalizations. There was no accelerated depreciation in the Successor period July 2, 2019 through December 31, 2019 or in the Predecessor period January 1, 2019 through July 1, 2019. Lastly, for the year ended December 31, 2020 and the Successor period July 2, 2019 through December 31, 2019, the Predecessor period January 1, 2019 through July 1, 2019 and the year ended December 31, 2018, “Capitalized expenditures” in the Consolidated Statements of Cash Flows were increased by $2, decreased by $8, increased by $7 and increased by $5, respectively, to reflect the change in invoiced but unpaid capital expenditures at each respective year-end as a non-cash investing activity. Leases —The Company adopted ASU 2016-02 using a modified retrospective adoption method at January 1, 2019. Under this method of adoption, there is no impact to the comparative Consolidated Statement of Operations and the Consolidated Balance Sheets. The Company also determined that there was no cumulative-effect adjustment to beginning retained earnings on the Consolidated Balance Sheet. The Company will continue to report periods prior to January 1, 2019 in its financial statements under prior guidance as outlined in Accounting Standards Codification Topic 840, “Leases”. In addition, the Company elected the package of practical expedients permitted under the transition guidance within the new standard, which allowed the Company to carry forward its historical lease classification. The Company also elected the hindsight practical expedient to determine the lease term for existing leases. The Company determines if a contract is a lease at the inception of the arrangement. The Company reviews all options to extend, terminate, or purchase its right of use assets at the inception of the lease and accounts for these options when they are reasonably certain of being exercised. Nearly all of the Company’s lease contracts do not provide a readily determinable implicit rate. For these contracts, the Company estimates the incremental borrowing rate to discount the lease payments based on information available at lease commencement. Leases with an initial term of 12 months or less are not recorded on the balance sheet and the Company recognizes lease expense for these leases on a straight-line basis over the lease term. For lease agreements entered into or reassessed after the adoption of Topic 842, the Company combines lease and non-lease components. See Note 13 for more information. Capitalized Software —The Company capitalizes certain costs, such as software coding, installation and testing, that are incurred to purchase or create and implement computer software for internal use. Amortization is recorded on the straight-line basis over the estimated useful lives, which range from 1 to 5 years. Goodwill and Intangibles —The excess of purchase price over net tangible and identifiable intangible assets of businesses acquired is carried as “Goodwill” in the Consolidated Balance Sheets. Separately identifiable intangible assets that are used in the operations of the business (e.g., patents and technology, tradenames, customer lists and contracts) are recorded at cost (fair value at the time of acquisition) and reported as “Other intangible assets, net” in the Consolidated Balance Sheets. Costs to renew or extend the term of identifiable intangible assets are expensed as incurred. The Company does not amortize goodwill. Intangible assets with determinable lives are amortized on a straight-line basis over the legal or economic life of the assets, which range from 15 to 25 years (see Note 6 and Note 10). As a result of the application of fresh start accounting the Company established $178 of Successor goodwill and $1,219 of Successor intangibles upon Emergence. Refer to Note 6 for additional information related to Emergence. The amount of goodwill and intangibles related to continuing operations is $164 and $1,079, respectively. Refer to Note 10 for additional information. Impairment —The Company reviews property and equipment, leases and all amortizable intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of these assets may not be recoverable. Recoverability is based on estimated undiscounted cash flows or other relevant observable measures. The Company tests goodwill for impairment annually, or when events or changes in circumstances indicate impairment may exist, by comparing the estimated fair value of each reporting unit with goodwill to its carrying value to determine if there is an indication that a potential impairment may exist. Long-Lived Assets and Amortizable Intangible Assets There were $16 long-lived asset impairments recorded during the year ended December 31, 2020 and there were no long-lived asset impairments for the Successor period July 2, 2019 through December 31, 2019 or the Predecessor period January 1, 2019 through July 1, 2019. During the year ended December 31, 2018, the Company recorded long-lived asset impairments of $28, which are included in “Asset impairments” in the Consolidated Statements of Operations (see Note 8 for more information). Goodwill The Company’s reporting units in continuing operations include epoxy, versatics and forest products. The Company’s reporting units are generally one level below the operating segments for which discrete financial information is available and reviewed by segment management. However, components of an operating segment can be aggregated as one reporting unit if the components have similar economic characteristics. The Company’s consolidated goodwill balance from continuing operations was $164 as of December 31, 2020, including $127 related to the forest products reporting unit, $36 related to the versatics reporting unit and $1 related to the epoxy reporting unit. The Company tests goodwill annually for impairment of value or more frequently when potential impairment triggering events are present. The Company’s annual impairment testing date is October 1. Goodwill is tested for impairment by comparing the estimated fair value of a reporting unit to its carrying value. The Company uses a weighted market and income approach to estimate the fair value of its reporting units. The market approach is a comparable analysis technique commonly used in the investment banking and private equity industries based on the EBITDA (earnings before interest, income taxes, depreciation and amortization) multiple technique, and the income approach is based on a discounted cash flow model. The key assumptions and estimates utilized in the market and income approaches primarily include market multiples, discount rates and future levels of revenue growth and operating margins, and to a lesser extent, estimates and assumptions related to working capital investment, taxes, depreciation and amortization and capital spending projections. If the carrying value of the reporting unit exceeds the estimated fair value, an impairment charge is recorded for the difference. As of October 1, 2020 and 2019, the estimated fair value of each of the Company’s remaining reporting units was deemed to be in excess of the carrying amount of assets (including goodwill) and liabilities assigned to each reporting unit. The step-up of fixed and intangible asset values during fresh start accounting resulted in an increase of the carrying amounts of net assets for the Company’s reporting units that have goodwill, thereby reducing the amount of headroom between the fair value and carrying value of these reporting units. As a result, future unfavorable changes to business results and/or discounted cash flows for these reporting units are more likely to result in asset impairments. General Insurance —The Company is generally insured for losses and liabilities for workers’ compensation, physical damage to property, business interruption and comprehensive general, product and vehicle liability under high-deductible insurance policies. The Company records losses when they are probable and reasonably estimable and amortizes insurance premiums over the life of the respective insurance policies. Legal Claims and Costs —The Company accrues for legal claims and costs in the period in which a claim is made or an event becomes known, if the amounts are probable and reasonably estimable. Each claim is assigned a range of potential liability and the most likely amount is accrued. If there is no amount in the range of potential liability that is most likely, the low end of the range is accrued. The amount accrued includes all costs associated with the claim, including settlements, assessments, judgments and fines. Legal fees are expensed as incurred (see Note 14). Environmental Matters —Accruals for environmental matters are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated. Environmental accruals are reviewed on a quarterly basis and as events and developments warrant (see Note 14). Asset Retirement Obligations —Asset retirement obligations are initially recorded at their estimated net present values in the period in which the obligation occurs, with a corresponding increase to the related long-lived asset. Over time, the liability is accreted to its settlement value and the capitalized cost is depreciated over the useful life of the related asset. When the liability is settled, a gain or loss is recognized for any difference between the settlement amount and the liability that was recorded. Revenue Recognition —The Company follows the principles-based five step model to recognize revenue upon the transfer of promised goods or services to customers and in an amount that reflects the consideration for which the entity expects to be entitled in exchange for those goods or services. Revenue, net of estimated allowances and returns, is recognized when the Company has completed its performance obligations under a contract and control of the product is transferred to the customer. Substantially all revenue is recognized at the time shipment is made or upon delivery as risk and title to the product transfer to the customer. Sales, value add, and other taxes that are collected concurrently with revenue-producing activities are excluded from revenue. Contract terms for certain transactions, including sales made on a consignment basis, result in the transfer of control of the finished product to the customer prior to the point at which the Company has the right to invoice for the product. In these cases, timing of revenue recognition will differ from the timing of invoicing to customers and will result in the Company recording a contract asset. The Company adopted ASU 2014-09 as of January 1, 2018 utilizing a modified retrospective approach. A contract asset balance of $5 and $6 is recorded within “Other current assets” at December 31, 2020 and 2019, respectively, in the Consolidated Balance Sheet. Refer to Note 20 for additional discussion of the Company’s net sales by reportable segment disaggregated by geographic region. Shipping and Handling —Freight costs that are billed to customers are included in “Net sales” in the Consolidated Statements of Operations. Shipping costs are incurred to move the Company’s products from production and storage facilities to the customer. Handling costs are incurred from the point the product is removed from inventory until it is provided to the shipper and generally include costs to store, move and prepare the products for shipment. Revenue from shipping and handling services is recognized when control of the product is transferred to the customer. Shipping and handling costs are recorded in “Cost of sales” in the Consolidated Statements of Operations. Turnaround Costs —The Company periodically performs procedures at its major production facilities to extend the useful life, increase output and efficiency and ensure the long-term reliability and safety of plant machinery (“turnaround” or “turnaround costs”). As a result of the application of fresh start accounting upon the Company’s emergence from Chapter 11, the Successor Company adopted an accounting policy to capitalize certain turnaround costs and amortize on a straight-line basis over the estimated period until the next turnaround. Costs for routine repairs and maintenance are expensed as incurred. Capitalized turnaround costs were $7 and $2 at December 31, 2020 and 2019 and are included in “Machinery and equipment” in the Consolidated Balance Sheets. Research and Development Costs —Funds are committed to research and development activities for technical improvement of products and processes that are expected to contribute to future earnings. We also provide customer service through our technical staff as part of our research and development program to discover new applications and processes. All costs associated with research and development and technical services are charged to expense as incurred. Research and development and technical service expense was $38, $20, $21 and $43 for the year ended December 31, 2020, the Successor period ended July 2, 2019 through December 31, 2019, the Predecessor period January 1, 2019 through July 1, 2019 and the year ended December 31, 2018, respectively, and is included in “Selling, general and administrative expense” in the Consolidated Statements of Operations. Business Realignment Costs —The Company incurred “Business realignment costs” totaling $69, $22, $14 and $27 for the year ended December 31, 2020, the Successor period July 2, 2019 through December 31, 2019, the Predecessor period January 1, 2019 through July 1, 2019 and the year ended December 31, 2018, respectively. These costs primarily included costs related to in-process cost reduction programs and certain in-process and recently completed facility rationalizations. Pension and Other Non-Pension Postretirement Benefit Liabilities —Pension and other non-pension postretirement benefit (“OPEB”) assumptions are significant inputs to the actuarial models that measure pension and OPEB benefit obligations and related effects on operations. Two assumptions, discount rate and expected return on assets, are important elements of plan expense and asset/liability measurement. The Company evaluates these critical assumptions at least annually on a plan and country-specific basis. The Company periodically evaluates other assumptions involving demographic factors, such as retirement age, mortality and turnover, and updates them to reflect the Company's experience and expectations for the future. Actual results in any given year will often differ from actuarial assumptions because of economic and other factors. Accumulated and projected benefit obligations are measured as the present value of future cash payments. The Company discounts these cash payments using a split-rate interest approach. This approach uses multiple interest rates from market-observed forward yield curves which correspond to the estimated timing of the related benefit payments. Lower discount rates increase present values and higher discount rates decrease present values. To determine the expected long-term rate of return on pension plan assets, the Company considers current and expected asset allocations, as well as historical and expected returns on various categories of plan assets. In developing future return expectations for the principal benefit plans’ assets, the Company evaluates general market trends as well as key elements of asset class returns such as expected earnings growth, yields and spreads across a number of potential scenarios. Upon the Company’s annual remeasurement of its pension and OPEB liabilities in the fourth quarter, or on an interim basis as triggering events warrant remeasurement, the Company immediately recognizes gains and losses as a mark-to-market (“MTM”) gain or loss through earnings. As such, the Company’s net periodic pension and OPEB expense consists of i) service cost, interest cost, expected return on plan assets, amortization of prior service cost/credits recognized on a quarterly basis and ii) MTM adjustments recognized annually in the fourth quarter upon remeasurement of pension and OPEB liabilities or when triggering events warrant remeasurement. The MTM adjustments were a loss of $4, loss of $5 and a gain of $13 for the year ended December 31, 2020, the Successor period July 2, 2019 through December 31, 2019, and the year ended December 31, 2018, respectively, and are recognized in “Other non-operating (income) expense, net” in the Consolidated Statements of Operations. A MTM loss of $44 was recorded upon the Company’s emergence from bankruptcy (see Note 5 for more information) which was included within “Reorganization items, net” on the Consolidated Statement of Operations for the Predecessor period January 1, 2019 through July 1, 2019. Income Taxes —The Company recognizes deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial statement carrying amounts and the tax bases of the assets and liabilities. Deferred tax balances are adjusted to reflect tax rates, based on current tax laws, which will be in effect in the years in which temporary differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized (see Note 17). Unrecognized tax benefits are generated when there are differences between tax positions taken in a tax return and amounts recognized in the consolidated financial statements. Tax benefits are recognized in the consolidated financial statements when it is more likely than not that a tax position will be sustained upon examination. Tax benefits are measured as the largest amount of benefit that is greater than 50% likely of being realized upon settlement. The Company classifies interest and penalties as a component of tax expense. The Company monitors changes in tax laws and reflects the impact of tax law changes in the period of enactment. See Note 17 for additional information on how the Company recorded the impacts of the U.S. tax reform. Derivative Financial Instruments and Hedging Activities —Periodically, the Company is a party to forward exchange contracts, foreign exchange rate swaps, interest rate swaps, natural gas futures and electricity forward contracts to reduce its cash flow exposure to changes in interest rates and natural gas and electricity prices. The Company does not hold or issue derivative financial instruments for trading purposes. All derivatives, whether designated as hedging relationships or not, are recorded on our balance sheet at fair value. For fair value and cash flow hedges qualifying for hedge accounting, the Company formally documents at inception the relationship between hedging instruments and hedged items, the risk management objective, strategy and the evaluation of effectiveness for the hedge transaction. If the derivative is designated as a cash flow hedge, changes in the fair value of the derivative are recorded in accumulated other comprehensive income, to the extent effective, and will be recognized in the Consolidated Statement of Operations when settled. The effectiveness of a cash flow hedging relationship is established at the inception of the hedge, and after inception the Company performs effectiveness assessments at least every three months. For a derivative that does not qualify or has not been designated as a hedge, changes in fair value are recognized in earnings. Stock-Based Compensation —All stock-based compensation activity relates to shares issued by Hexion Holdings, the ultimate parent of the Company. Stock-based compensation cost is measured at the grant date based on the fair value of the award which is amortized as expense over the requisite service period or derived service period on a graded-vesting basis. The expense is recorded net of forfeitures upon occurrence (see Note 16). Transfers of Financial Assets —The Company executes factoring and sales agreements with respect to its trade accounts receivable to support its working capital requirements. The Company accounts for these transactions as either sales-type or financing-type transfers of financial assets based on the terms and conditions of each agreement. For the portion of the sales price that is deferred in a reserve account and subsequently collected, the Company’s policy is to classify the cash in-flows as cash flows from operating activities as the predominant source of the cash flows pertains to the Company’s trade accounts receivable. The remaining portion of the sales price not deferred is recognized as cash flows from operating activities. When the Company retains the servicing rights on the transfers of accounts receivable, it measures these rights at fair value, if material. Concentrations of Credit Risk —Financial instruments that potentially subject the Company to concentrations of credit risk are primarily temporary investments and accounts receivable. The Company places its temporary investments with high quality institutions and, by policy, limits the amount of credit exposure to any one institution. Concentrations of credit risk for accounts receivable are limited due to the large number of customers in the Company’s customer base and their dispersion across many different industries and geographies. The Company generally does not require collateral or other security to support customer receivables. Concentrations of Supplier Risk —The Company relies on long-term agreements with key suppliers for most of its raw materials. The loss of a key source of supply or a delay in shipments could have an adverse effect on its business. Should any of the suppliers fail to deliver or should any of the key long-term supply contracts be canceled, the Company would be forced to purchase raw materials at current market prices. The Company’s largest supplier provides approximately 9% of raw material purchases. In addition, several of the feedstocks at various facilities are transported through a pipeline from one supplier. Subsequent Events —The Company has evaluated events and transactions subsequent to December 31, 2020 through the date of issuance of its Consolidated Financial Statements. Reclassifications —Certain amounts in the Consolidated Financial Statements for prior periods have been reclassified to conform with the current presentation. These reclassifications were to record the assets and liabilities of the Held for Sale Business and the results of operations as disconti |
