Celanese (CE) 10-Q 17 Apr 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 10, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	CELANESE CORPORATION
Entity Central Index Key	1,306,830
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		135,855,710
Entity Current Reporting Status	Yes

Unaudited Interim Consolidated

Unaudited Interim Consolidated Statement of Operations - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net sales	$ 1,851	$ 1,471
Cost of sales	(1,336)	(1,121)
Gross profit	515	350
Selling, general and administrative expenses	(147)	(103)
Amortization of intangible assets	(6)	(4)
Research and development expenses	(18)	(17)
Other (charges) gains, net	0	(55)
Foreign exchange gain (loss), net	(1)	0
Gain (loss) on disposition of businesses and assets, net	0	(1)
Operating profit (loss)	343	170
Equity in net earnings (loss) of affiliates	58	47
Non-operating pension and other postretirement employee benefit (expense) income	26	22
Interest expense	(33)	(29)
Interest income	2	0
Dividend income - cost investments	32	29
Other income (expense), net	4	1
Earnings (loss) from continuing operations before tax	432	240
Income tax (provision) benefit	(65)	(56)
Earnings (loss) from continuing operations	367	184
Earnings (loss) from operation of discontinued operations	(2)	0
Income tax (provision) benefit from discontinued operations	0	0
Earnings (loss) from discontinued operations	(2)	0
Net earnings (loss)	365	184
Net (earnings) loss attributable to noncontrolling interests	(2)	(1)
Net earnings (loss) attributable to Celanese Corporation	363	183
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations	365	183
Earnings (loss) from discontinued operations	(2)	0
Net earnings (loss)	$ 363	$ 183
Earnings (loss) per common share - basic
Continuing operations	$ 2.69	$ 1.30
Discontinued operations	(0.02)	0
Net earnings (loss) - basic	2.67	1.30
Earnings (loss) per common share - diluted
Continuing operations	2.68	1.30
Discontinued operations	(0.02)	0
Net earnings (loss) - diluted	$ 2.66	$ 1.30
Weighted average shares - basic	135,916,446	140,643,860
Weighted average shares - diluted	136,383,735	140,997,403

Unaudited Interim Consolidated3

Unaudited Interim Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net earnings (loss)	$ 365	$ 184
Other comprehensive income (loss), net of tax
Foreign currency translation	49	28
Gain (loss) on cash flow hedges	(1)	(2)
Pension and postretirement benefits	1	5
Total other comprehensive income (loss), net of tax	49	31
Total comprehensive income (loss), net of tax	414	215
Comprehensive (income) loss attributable to noncontrolling interests	(2)	(1)
Comprehensive income (loss) attributable to Celanese Corporation	$ 412	$ 214

Unaudited Consolidated Balance

Unaudited Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2018		Dec. 31, 2017
Current Assets
Cash and cash equivalents (variable interest entity restricted - 2018: $18; 2017: $19)	$ 490		$ 576
Trade receivables - third party and affiliates (net of allowance for doubtful accounts - 2018: $9; 2017: $9; variable interest entity restricted - 2018: $5; 2017: $5)	1,205		986
Non-trade receivables, net (variable interest entity restricted - 2018: $1; 2017: $0)	271		244
Inventories	955		900
Marketable securities, at fair value	32		32
Other assets	53		54
Total current assets	3,006		2,792
Investments in affiliates	979		976
Property, plant and equipment (net of accumulated depreciation - 2018: $2,686; 2017: $2,584; variable interest entity restricted - 2018: $689; 2017: $697)	3,801		3,762
Deferred income taxes	182		366
Other assets (variable interest entity restricted - 2018: $7; 2017: $6)	369		338
Goodwill	1,107	[1]	1,003
Intangible assets (variable interest entity restricted - 2018: $25; 2017: $25)	336		301
Total assets	9,780		9,538
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	425		326
Trade payables - third party and affiliates	797		807
Other liabilities	266		354
Income taxes payable	114		72
Total current liabilities	1,602		1,559
Long-term debt, net of unamortized deferred financing costs	3,343		3,315
Deferred income taxes	219		211
Uncertain tax positions	152		156
Benefit obligations	582		585
Other liabilities	217		413
Commitments and Contingencies
Stockholders' Equity
Preferred stock, $0.01 par value, 100,000,000 shares authorized (2018 and 2017: 0 issued and outstanding)	0		0
Treasury stock, at cost (2018: 32,387,713 shares; 2017: 32,387,713 shares)	(2,031)		(2,031)
Additional paid-in capital	192		175
Retained earnings	5,220		4,920
Accumulated other comprehensive income (loss), net	(128)		(177)
Total Celanese Corporation stockholders' equity	3,253		2,887
Noncontrolling interests	412		412
Total equity	3,665		3,299
Total liabilities and equity	9,780		9,538
Series A common stock, $0.0001 par value, 400,000,000 shares authorized (2018: 168,243,423 issued and 135,855,710 outstanding; 2017: 168,156,969 issued and 135,769,256 outstanding)
Stockholders' Equity
Common stock	0		0
Series B common stock, $0.0001 par value, 100,000,000 shares authorized (2018 and 2017: 0 issued and outstanding)
Stockholders' Equity
Common stock	$ 0		$ 0
[1]	There were $0 million of accumulated impairment losses as of March 31, 2018.

Unaudited Consolidated Balance5

Unaudited Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 490	$ 576
Allowance for doubtful accounts - trade receivables	9	9
Trade receivables - third party and affiliates	1,205	986
Nontrade Receivables, Current	271	244
Accumulated depreciation	2,686	2,584
Property, plant and equipment (net of accumulated depreciation - 2018: $2,686; 2017: $2,584; variable interest entity restricted - 2018: $689; 2017: $697)	3,801	3,762
Other assets	369	338
Intangible assets (variable interest entity restricted - 2018: $25; 2017: $25)	$ 336	$ 301
Stockholders' Equity
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Treasury stock, shares	32,387,713	32,387,713
Series A common stock, $0.0001 par value, 400,000,000 shares authorized (2018: 168,243,423 issued and 135,855,710 outstanding; 2017: 168,156,969 issued and 135,769,256 outstanding)
Stockholders' Equity
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	168,243,423	168,156,969
Common stock, shares outstanding	135,855,710	135,769,256
Series B common stock, $0.0001 par value, 100,000,000 shares authorized (2018 and 2017: 0 issued and outstanding)
Stockholders' Equity
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	0	0
Common stock, shares outstanding	0	0
Variable Interest Entity, Primary Beneficiary [Member]
Current Assets
Cash and cash equivalents	$ 18	$ 19
Trade receivables - third party and affiliates	5	5
Nontrade Receivables, Current	1	0
Property, plant and equipment (net of accumulated depreciation - 2018: $2,686; 2017: $2,584; variable interest entity restricted - 2018: $689; 2017: $697)	689	697
Other assets	7	6
Intangible assets (variable interest entity restricted - 2018: $25; 2017: $25)	$ 25	$ 25

Unaudited Interim Consolidated6

Unaudited Interim Consolidated Statement Equity - 3 months ended Mar. 31, 2018 - USD ($) $ in Millions	Total	Series A Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balance as of the beginning of the period, shares at Dec. 31, 2017		135,769,256	32,387,713
Balance as of the beginning of the period at Dec. 31, 2017	$ 3,299
Total Celanese Corporation stockholders' equity at Dec. 31, 2017	$ 2,887	$ 0	$ (2,031)	$ 175	$ 4,920	$ (177)
Stock option exercises, shares		0
Stock option exercises, net of tax		$ 0
Purchases of treasury stock, shares		0
Purchases of treasury stock, including related fees		$ 0
Stock awards, shares		86,454
Stock awards		$ 0
Purchases of treasury stock, shares	0		0
Purchases of treasury stock, including related fees	$ 0		$ 0
Stock-based compensation, net of tax				17
Net earnings (loss) attributable to Celanese Corporation	363				363
Series A common stock dividends					(63)
Other comprehensive income (loss), net of tax	49					49
Balance as of the end of the period, shares at Mar. 31, 2018		135,855,710	32,387,713
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2017	412						$ 412
Net earnings (loss) attributable to noncontrolling interests	2						2
(Distributions to) contributions from noncontrolling interests							(2)
Stockholders' Equity Attributable to Noncontrolling Interest at Mar. 31, 2018	412						$ 412
Total Celanese Corporation stockholders' equity at Mar. 31, 2018	3,253	$ 0	$ (2,031)	$ 192	$ 5,220	$ (128)
Balance as of the end of the period at Mar. 31, 2018	$ 3,665

Unaudited Interim Consolidated7

Unaudited Interim Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net earnings (loss)	$ 365	$ 184
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities
Depreciation, amortization and accretion	80	72
Pension and postretirement net periodic benefit cost	(24)	(20)
Pension and postretirement contributions	(12)	(11)
Deferred income taxes, net	(4)	14
(Gain) loss on disposition of businesses and assets, net	1	1
Stock-based compensation	22	10
Undistributed earnings in unconsolidated affiliates	19	3
Other, net	5	2
Operating cash provided by (used in) discontinued operations	0	(1)
Changes in operating assets and liabilities
Trade receivables - third party and affiliates, net	(190)	(79)
Inventories	(27)	9
Other assets	(29)	21
Trade payables - third party and affiliates	0	6
Other liabilities	(63)	(19)
Net cash provided by (used in) operating activities	143	192
Investing Activities
Capital expenditures on property, plant and equipment	(86)	(62)
Acquisitions, net of cash acquired	(144)	0
Proceeds from sale of businesses and assets, net	9	1
Other, net	(14)	(3)
Net cash provided by (used in) investing activities	(235)	(64)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	101	6
Proceeds from short-term borrowings	36	7
Repayments of short-term borrowings	(38)	(29)
Proceeds from long-term debt	0	0
Repayments of long-term debt	(31)	(53)
Purchases of treasury stock, including related fees	0	(128)
Series A common stock dividends	(63)	(51)
(Distributions to) contributions from noncontrolling interests	(2)	(4)
Other, net	(5)	(18)
Net cash provided by (used in) financing activities	(2)	(270)
Exchange rate effects on cash and cash equivalents	8	5
Net increase (decrease) in cash and cash equivalents	(86)	(137)
Cash and cash equivalents as of beginning of period	576	638
Cash and cash equivalents as of end of period	$ 490	$ 501

Description of the Company and

Description of the Company and Basis of Presentation	3 Months Ended
	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Description of the Company and Basis of Presentation	Description of the Company and Basis of Presentation Description of the Company Celanese Corporation and its subsidiaries (collectively, the "Company") is a global technology and specialty materials company. The Company's business involves processing chemical raw materials, such as methanol, carbon monoxide and ethylene, and natural products, including wood pulp, into value-added chemicals, thermoplastic polymers and other chemical-based products. Definitions In this Quarterly Report on Form 10-Q ("Quarterly Report"), the term "Celanese" refers to Celanese Corporation, a Delaware corporation, and not its subsidiaries. The term "Celanese US" refers to the Company's subsidiary, Celanese US Holdings LLC, a Delaware limited liability company, and not its subsidiaries. Basis of Presentation The unaudited interim consolidated financial statements for the three months ended March 31, 2018 and 2017 contained in this Quarterly Report were prepared in accordance with accounting principles generally accepted in the United States of America ("US GAAP") for all periods presented and include the accounts of the Company, its majority owned subsidiaries over which the Company exercises control and, when applicable, variable interest entities in which the Company is the primary beneficiary. The unaudited interim consolidated financial statements and other financial information included in this Quarterly Report, unless otherwise specified, have been presented to separately show the effects of discontinued operations. In the opinion of management, the accompanying unaudited consolidated balance sheets and related unaudited interim consolidated statements of operations, comprehensive income (loss), cash flows and equity include all adjustments, consisting only of normal recurring items necessary for their fair presentation in conformity with US GAAP. Certain information and footnote disclosures normally included in financial statements prepared in accordance with US GAAP have been condensed or omitted in accordance with rules and regulations of the Securities and Exchange Commission ("SEC"). These unaudited interim consolidated financial statements should be read in conjunction with the Company's consolidated financial statements as of and for the year ended December 31, 2017 , filed on February 9, 2018 with the SEC as part of the Company's Annual Report on Form 10-K. Operating results for the three months ended March 31, 2018 are not necessarily indicative of the results to be expected for the entire year. In the ordinary course of business, the Company enters into contracts and agreements relative to a number of topics, including acquisitions, dispositions, joint ventures, supply agreements, product sales and other arrangements. The Company endeavors to describe those contracts or agreements that are material to its business, results of operations or financial position. The Company may also describe some arrangements that are not material but in which the Company believes investors may have an interest or which may have been included in a Form 8-K filing. Investors should not assume the Company has described all contracts and agreements relative to the Company's business in this Quarterly Report. For those consolidated ventures in which the Company owns or is exposed to less than 100% of the economics, the outside stockholders' interests are shown as noncontrolling interests. During the three months ended March 31, 2018 , the Company settled its dispute concerning the exercise of an option right by a partner in two of the Company's InfraServ equity affiliate investments. As a result of the settlement, the Company's ownership in InfraServ GmbH & Co. Gendorf KG and InfraServ GmbH & Co. Knapsack KG was reduced from 39% and 27% , to 30% and 22% , respectively. The Company has reclassified certain prior period amounts due to (1) the adoption of ASU 2017-07 (defined below in Note 2 ) and (2) to conform to the presentation of the Company's current reportable segments ( Note 19 ). Estimates and Assumptions The preparation of unaudited interim consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the unaudited interim consolidated financial statements and the reported amounts of Net sales, expenses and allocated charges during the reporting period. Significant estimates pertain to impairments of goodwill, intangible assets and other long-lived assets, purchase price allocations, restructuring costs and other (charges) gains, net, income taxes, pension and other postretirement benefits, asset retirement obligations, environmental liabilities and loss contingencies, among others. Actual results could differ from those estimates.
InfraServ GmbH & Co. Gendorf KG [Member] | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	39.00%
InfraServ GmbH & Co. Gendorf KG [Member] | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	30.00%
InfraServ GmbH & Co. Knapsack KG [Member] | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	27.00%
InfraServ GmbH & Co. Knapsack KG [Member] | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	22.00%

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2018
Recent Accounting Pronouncements [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Recent Accounting Pronouncements The following table provides a brief description of recent Accounting Standard Updates ("ASU") issued by the Financial Accounting Standards Board ("FASB"): Standard Description Effective Date Effect on the Financial Statements or Other Significant Matters In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The new guidance allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act and will improve the usefulness of information reported to financial statement users. January 1, 2019. Early adoption is permitted. The Company is currently evaluating the impact of adoption on its financial statements and related disclosures. In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities. The new guidance improves the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. January 1, 2019. Early adoption is permitted. The Company adopted the new guidance effective January 1, 2018, as part of the FASB's simplification initiative. The adoption of the new guidance did not have a material impact to the Company. In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The new guidance clarifies the presentation and classification of the components of net periodic benefit costs in the consolidated statement of operations. January 1, 2018. The Company adopted the new guidance effective January 1, 2018, using the retrospective transition method, as part of the FASB's simplification initiative. See Adoption of ASU 2017-07 section below for additional information. In October 2016, the FASB issued ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory. The new guidance requires the income tax consequences of an intra-entity transfer of assets other than inventory to be recognized when the transfer occurs rather than deferring until an outside sale has occurred. January 1, 2018. The Company adopted the new guidance effective January 1, 2018, as part of the FASB's simplification initiative. The adoption of the new guidance did not have a material impact to the Company. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments. The new guidance clarifies the presentation and classification of certain cash receipts and cash payments in the statement of cash flows. January 1, 2018. The Company adopted the new guidance effective January 1, 2018, as part of the FASB's simplification initiative. The adoption of the new guidance did not have a material impact to the Company. In February 2016, the FASB issued ASU 2016-02, Leases. The new guidance supersedes the lease guidance under FASB Accounting Standards Codification ("ASC") Topic 840, Leases, resulting in the creation of FASB ASC Topic 842, Leases. The guidance requires a lessee to recognize in the statement of financial position a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term for both finance and operating leases. January 1, 2019. Early adoption is permitted. The Company is currently evaluating its population of leases, and is continuing to assess all potential impacts of the standard, but currently believes the most significant impact relates to its accounting for manufacturing and logistics equipment, and real estate operating leases. The Company anticipates recognition of additional assets and corresponding liabilities related to leases upon adoption, but has not yet quantified these at this time. The Company plans to adopt the standard effective January 1, 2019, but has not yet selected a transition method. Standard Description Effective Date Effect on the Financial Statements or Other Significant Matters In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. The new guidance updates certain aspects of recognition, measurement, presentation and disclosure of financial instruments. January 1, 2018. The Company adopted the new guidance effective January 1, 2018, using the modified retrospective approach, as part of the FASB's simplification initiative. The new guidance resulted in a cumulative-effect adjustment of less than $1 million to January 1, 2018 Retained earnings. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. Since that date, the FASB has issued additional ASUs clarifying certain aspects of ASU 2014-09. The new guidance requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The new guidance provides alternative methods of adoption. Subsequent guidance issued after May 2014 did not change the core principle of ASU 2014-09. January 1, 2018. The Company adopted the new guidance effective January 1, 2018, using the modified retrospective approach, as part of the FASB's simplification initiative. The adoption of the new guidance resulted in less than $1 million impact to the consolidated financial statements and related disclosures (See Note 20 ). Adoption of ASU 2017-07 ASU 2017-07 requires an entity to report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside a subtotal of Operating profit (loss). The new guidance represents a change in accounting principle. The Company adopted ASU 2017-07 on January 1, 2018 using the retrospective transition method. The adoption of this accounting standard resulted in a change in certain previously reported amounts, as follows: Three Months Ended March 31, 2017 As previously reported Adoption of ASU 2017-07 As Adjusted (In $ millions) Cost of sales (1,119 ) (2 ) (1,121 ) Selling, general and administrative expenses (83 ) (20 ) (103 ) Operating profit (loss) 192 (22 ) 170 Non-operating pension and other postretirement employee benefit (expense) income — 22 22 The adoption of this accounting standard had no impact on the previously reported Earnings (loss) from continuing operations or Net earnings (loss) for this period.

Acquisitions, Dispositions and

Acquisitions, Dispositions and Plant Closures	3 Months Ended
	Mar. 31, 2018
Acquisitions, Dispositions and Plant Closures [Abstract]
Acquisitions, Dispositions and Plant Closures [Text Block]	Acquisitions, Dispositions and Plant Closures Acquisitions • Omni Plastics On February 1, 2018, using cash on hand and borrowings under the Company's senior unsecured revolving credit facility, the Company acquired 100% of the ownership interests of Omni Plastics, L.L.C. and its subsidiaries ("Omni Plastics"). Omni Plastics specializes in custom compounding of various engineered thermoplastic materials. The acquisition further strengthens the Company's global asset base by adding compounding capacity in the Americas. The acquisition was accounted for as a business combination and the acquired operations are included in the Engineered Materials segment. Pro forma financial information since the respective acquisition date has not been provided as the acquisition did not have a material impact on the Company's financial information. The Company allocated the purchase price of the acquisition to identifiable assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date. The excess of the purchase price over the aggregate fair values was recorded as goodwill. The Company calculated the fair value of the assets acquired using the income, market or cost approach (or a combination thereof). Fair values were determined based on Level 3 inputs including estimated future cash flows, discount rates, royalty rates, growth rates, sales projections, retention rates and terminal values, all of which require significant management judgment and are susceptible to change. The purchase price allocation is based upon preliminary information and is subject to change if additional information about the facts and circumstances that existed at the acquisition date becomes available. The final fair value of the net assets acquired may result in adjustments to the assets and liabilities, including goodwill. However, any subsequent measurement period adjustments are not expected to have a material impact on the Company's results of operations. The preliminary purchase price allocation for the Omni Plastics acquisition is as follows: As of February 1, 2018 (In $ millions) Cash and cash equivalents 2 Trade receivables - third party and affiliates 12 Inventories 13 Property, plant and equipment, net 19 Intangible assets ( Note 7 ) 35 Goodwill (1) ( Note 7 ) 84 Other assets 1 Total fair value of assets acquired 166 Trade payables - third party and affiliates (8 ) Total debt (12 ) Total fair value of liabilities assumed (20 ) Net assets acquired 146 ______________________________ (1) Goodwill consists of expected revenue and operating synergies resulting from the acquisition, all of which is deductible for income tax purposes. The amount of pro forma Net earnings (loss) of Omni Plastics included in the Company's unaudited interim consolidated statement of operations was less than 1% (unaudited) of its consolidated Net earnings (loss) had the acquisition occurred as of the beginning of 2018. The amount of Omni Plastics' Net earnings (loss) consolidated by the Company since the acquisition date was not material. • Acetate Tow Joint Venture In June 2017, Celanese, through various subsidiaries, entered into an agreement with affiliates of The Blackstone Group L.P. (the "Blackstone Entities") to form a joint venture which would combine substantially all of the operations of the Company's cellulose derivatives business and the operations of the Rhodia Acetow cellulose acetate business formerly operated by Solvay S.A. and acquired by the Blackstone Entities in June 2017. The parties were subsequently unable to reach an agreement with the European Commission on acceptable conditions to allow the proposed joint venture to proceed. The demands by the European Commission eliminated the advantages at the heart of the transaction. As a result, on March 19, 2018, the Company and the Blackstone Entities abandoned their agreement to form the proposed joint venture. • Nilit Plastics In May 2017, using cash on hand and borrowings under the Company's senior unsecured revolving credit facility, the Company acquired the nylon compounding division of Nilit Group ("Nilit"), an independent producer of high performance nylon resins, fibers and compounds. Celanese acquired the nylon compounding product portfolio, customer agreements and manufacturing, technology and commercial facilities. The acquisition of Nilit increases the Company's global engineered materials product platforms, extends the operational model, technical and industry solutions capabilities and expands project pipelines. The acquisition was accounted for as a business combination and the acquired operations are included in the Engineered Materials segment. The purchase price allocation was based on preliminary information and is subject to change if additional information about the facts and circumstances that existed at the acquisition date becomes available. The final fair value of the net assets acquired may result in adjustments to the assets and liabilities, including goodwill. Since the acquisition date, the Company made certain adjustments to its purchase price allocation to adjust taxes and working capital, which resulted in a $2 million reduction to goodwill. Any subsequent measurement period adjustments are not expected to have a material impact on the Company's results of operations.

Ventures and Variable Interest

Ventures and Variable Interest Entities	3 Months Ended
	Mar. 31, 2018
Ventures and Variable Interest Entities [Abstract]
Ventures and Variable Interest Entities	Ventures and Variable Interest Entities Consolidated Variable Interest Entities The Company has a joint venture, Fairway Methanol LLC ("Fairway"), with Mitsui & Co., Ltd., of Tokyo, Japan ("Mitsui"), in which the Company owns 50% of Fairway, for the production of methanol at the Company's integrated chemical plant in Clear Lake, Texas. The methanol unit utilizes natural gas in the US Gulf Coast region as a feedstock and benefits from the existing infrastructure at the Company's Clear Lake facility. Both Mitsui and the Company supply their own natural gas to Fairway in exchange for methanol tolling under a cost-plus off-take arrangement. The Company determined that Fairway is a variable interest entity ("VIE") in which the Company is the primary beneficiary. Under the terms of the joint venture agreements, the Company provides site services and day-to-day operations for the methanol facility. In addition, the joint venture agreements provide that the Company indemnifies Mitsui for environmental obligations that exceed a specified threshold, as well as an equity option between the partners. Accordingly, the Company consolidates the venture and records a noncontrolling interest for the share of the venture owned by Mitsui. Fairway is included in the Company's Acetyl Intermediates segment. The carrying amount of the assets and liabilities associated with Fairway included in the unaudited consolidated balance sheets are as follows: As of As of (In $ millions) Cash and cash equivalents 18 19 Trade receivables, net - third party & affiliate 9 9 Non-trade receivables, net 1 — Property, plant and equipment (net of accumulated depreciation - 2018: $100; 2017: $90) 689 697 Intangible assets (net of accumulated amortization - 2018: $3; 2017: $2) 25 25 Other assets 7 6 Total assets (1) 749 756 Trade payables 7 16 Other liabilities (2) 5 4 Total debt 5 5 Deferred income taxes 3 3 Total liabilities 20 28 ______________________________ (1) Assets can only be used to settle the obligations of Fairway. (2) Primarily represents amounts owed by Fairway to the Company for reimbursement of expenditures. Nonconsolidated Variable Interest Entities The Company holds variable interests in entities that supply certain raw materials and services to the Company. The variable interests primarily relate to cost-plus contractual arrangements with the suppliers and recovery of capital expenditures for certain plant assets plus a rate of return on such assets. Liabilities for such supplier recoveries of capital expenditures have been recorded as capital lease obligations. The entities are not consolidated because the Company is not the primary beneficiary of the entities as it does not have the power to direct the activities of the entities that most significantly impact the entities' economic performance. The Company's maximum exposure to loss as a result of its involvement with these VIEs as of March 31, 2018 , relates primarily to the recovery of capital expenditures for certain property, plant and equipment. The carrying amount of the assets and liabilities associated with the obligations to nonconsolidated VIEs, as well as the maximum exposure to loss relating to these nonconsolidated VIEs are as follows: As of As of (In $ millions) Property, plant and equipment, net 49 53 Trade payables 33 25 Current installments of long-term debt 13 18 Long-term debt 74 76 Total liabilities 120 119 Maximum exposure to loss 165 164 The difference between the total liabilities associated with obligations to nonconsolidated VIEs and the maximum exposure to loss primarily represents take-or-pay obligations for services included in the Company's unconditional purchase obligations ( Note 18 ).

Marketable Securities, at Fair

Marketable Securities, at Fair Value	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Marketable Securities, at Fair Value	Marketable Securities, at Fair Value The Company's nonqualified trusts hold available-for-sale securities for funding requirements of the Company's nonqualified pension plans ( Note 11 ) as follows: As of As of (In $ millions) Amortized cost 32 32 Gross unrealized gain — — Gross unrealized loss — — Fair value 32 32

Inventories

Inventories	3 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories As of As of (In $ millions) Finished goods 610 591 Work-in-process 58 57 Raw materials and supplies 287 252 Total 955 900

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, net	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure	Goodwill and Intangible Assets, Net Goodwill Engineered Materials Acetate Tow Industrial Specialties Acetyl Intermediates Total (In $ millions) As of December 31, 2017 643 149 40 171 1,003 Acquisitions ( Note 3 ) 84 — — — 84 Exchange rate changes 14 1 — 5 20 As of March 31, 2018 (1) 741 150 40 176 1,107 ______________________________ (1) There were $0 million of accumulated impairment losses as of March 31, 2018 . Intangible Assets, Net Finite-lived intangible assets are as follows: Licenses Customer- Related Intangible Assets Developed Technology Covenants Not to Compete and Other Total (In $ millions) Gross Asset Value As of December 31, 2017 38 640 45 54 777 Acquisitions ( Note 3 ) — 32 — 3 35 (1) Exchange rate changes 1 14 1 — 16 As of March 31, 2018 39 686 46 57 828 Accumulated Amortization As of December 31, 2017 (33 ) (496 ) (30 ) (32 ) (591 ) Amortization — (4 ) (1 ) (1 ) (6 ) Exchange rate changes (1 ) (10 ) (1 ) — (12 ) As of March 31, 2018 (34 ) (510 ) (32 ) (33 ) (609 ) Net book value 5 176 14 24 219 ______________________________ (1) Represents intangible assets acquired related to Omni Plastics ( Note 3 ) with a weighted average amortization period of 11 years . Indefinite-lived intangible assets are as follows: Trademarks and Trade Names (In $ millions) As of December 31, 2017 115 Acquisitions ( Note 3 ) — Accumulated impairment losses — Exchange rate changes 2 As of March 31, 2018 117 For the three months ended March 31, 2018 , the Company did not renew or extend any intangible assets. Estimated amortization expense for the succeeding five fiscal years is as follows: (In $ millions) 2019 21 2020 19 2021 18 2022 17 2023 15

Current Other Liabilities

Current Other Liabilities	3 Months Ended
	Mar. 31, 2018
Other Liabilities, Current [Abstract]
Current Other Liabilities	Current Other Liabilities As of As of (In $ millions) Asset retirement obligations 11 19 Benefit obligations ( Note 11 ) 30 30 Customer rebates 46 65 Derivatives ( Note 16 ) 3 3 Environmental ( Note 12 ) 18 14 Insurance 4 5 Interest 25 17 Restructuring ( Note 14 ) 4 5 Salaries and benefits 65 113 Sales and use tax/foreign withholding tax payable 19 16 Other 41 67 Total 266 354

Noncurrent Other Liabilities

Noncurrent Other Liabilities	3 Months Ended
	Mar. 31, 2018
Other Liabilities, Noncurrent [Abstract]
Noncurrent Other Liabilities	Noncurrent Other Liabilities As of As of (In $ millions) Asset retirement obligations 7 7 Deferred proceeds 48 47 Deferred revenue 6 6 Environmental ( Note 12 ) 57 59 Income taxes payable — 197 Insurance 43 43 Other 56 54 Total 217 413

Debt

Debt	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Debt	Debt As of As of (In $ millions) Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates Current installments of long-term debt 62 63 Short-term borrowings, including amounts due to affiliates (1) 89 86 Revolving credit facility (2) 197 97 Accounts receivable securitization facility (3) 77 80 Total 425 326 ______________________________ (1) The weighted average interest rate was 2.8% and 2.8% as of March 31, 2018 and December 31, 2017 , respectively. (2) The weighted average interest rate was 3.3% and 4.1% as of March 31, 2018 and December 31, 2017 , respectively. (3) The weighted average interest rate was 2.4% and 2.1% as of March 31, 2018 and December 31, 2017 , respectively. As of As of (In $ millions) Long-Term Debt Senior unsecured term loan due 2021 (1) 488 494 Senior unsecured notes due 2019, interest rate of 3.250% 370 360 Senior unsecured notes due 2021, interest rate of 5.875% 400 400 Senior unsecured notes due 2022, interest rate of 4.625% 500 500 Senior unsecured notes due 2023, interest rate of 1.125% 922 897 Senior unsecured notes due 2025, interest rate of 1.250% 369 359 Pollution control and industrial revenue bonds due at various dates through 2030, interest rates ranging from 4.05% to 5.00% 169 169 Nilit bank loans due at various dates through 2026 ( Note 3 ) (2) 12 11 Obligations under capital leases due at various dates through 2054 194 208 Subtotal 3,424 3,398 Unamortized debt issuance costs (3) (19 ) (20 ) Current installments of long-term debt (62 ) (63 ) Total 3,343 3,315 ______________________________ (1) The margin for borrowings under the senior unsecured term loan due 2021 was 1.5% above LIBOR at current Company credit ratings. (2) The weighted average interest rate was 1.3% and 1.3% as of March 31, 2018 and December 31, 2017 , respectively. (3) Related to the Company's long-term debt, excluding obligations under capital leases. Senior Credit Facilities In July 2016, Celanese, Celanese US and certain subsidiaries entered into a new senior credit agreement ("Credit Agreement") consisting of a $500 million senior unsecured term loan and a $1.0 billion senior unsecured revolving credit facility (with a letter of credit sublimit), each maturing in 2021. The Credit Agreement is guaranteed by Celanese, Celanese US and substantially all of its domestic subsidiaries (the "Subsidiary Guarantors"). The Company's debt balances and amounts available for borrowing under its senior unsecured revolving credit facility are as follows: As of (In $ millions) Revolving Credit Facility Borrowings outstanding (1) 197 Letters of credit issued — Available for borrowing (2) 803 ______________________________ (1) The Company borrowed $435 million and repaid $335 million under its senior unsecured revolving credit facility during the three months ended March 31, 2018 . (2) The margin for borrowings under the senior unsecured revolving credit facility was 1.5% above LIBOR at current Company credit ratings. Senior Notes The Company has outstanding senior unsecured notes, issued in public offerings registered under the Securities Act of 1933 ("Securities Act"), as amended (collectively, the "Senior Notes"). The Senior Notes were issued by Celanese US and are guaranteed on a senior unsecured basis by Celanese and the Subsidiary Guarantors. Accounts Receivable Securitization Facility The Company has a US accounts receivable securitization facility involving receivables of certain of its domestic subsidiaries of the Company transferred to a wholly-owned, "bankruptcy remote" special purpose subsidiary of the Company ("SPE"). The securitization facility, which permits cash borrowings and letters of credit, expires in July 2019. All of the SPE's assets have been pledged to the administrative agent in support of the SPE's obligations under the facility. The Company's debt balances and amounts available for borrowing under its securitization facility are as follows: As of (In $ millions) Accounts Receivable Securitization Facility Borrowings outstanding (1) 77 Letters of credit issued 29 Available for borrowing 3 Total borrowing base 109 Maximum borrowing base (2) 120 ______________________________ (1) The Company borrowed $25 million and repaid $28 million during the three months ended March 31, 2018 . (2) Outstanding accounts receivable transferred to the SPE was $166 million . Covenants The Company's material financing arrangements contain customary covenants, including the maintenance of certain financial ratios, events of default and change of control provisions. Failure to comply with these covenants, or the occurrence of any other event of default, could result in acceleration of the borrowings and other financial obligations. The Company is in compliance with all covenants related to its debt agreements as of March 31, 2018 .

Benefit Obligations

Benefit Obligations	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Benefit Obligations	Benefit Obligations The components of net periodic benefit cost are as follows: Three Months Ended March 31, 2018 2017 Pension Post-retirement Pension Post-retirement (In $ millions) Service cost 2 — 2 — Interest cost 26 — 27 — Expected return on plan assets (52 ) — (49 ) — Total (24 ) — (20 ) — Benefit obligation funding is as follows: As of Total Expected 2018 (In $ millions) Cash contributions to defined benefit pension plans 6 23 Benefit payments to nonqualified pension plans 5 21 Benefit payments to other postretirement benefit plans 1 5 Cash contributions to German multiemployer defined benefit pension plans (1) 2 8 ______________________________ (1) The Company makes contributions based on specified percentages of employee contributions. The Company's estimates of its US defined benefit pension plan contributions reflect the provisions of the Pension Protection Act of 2006.

Environmental

Environmental	3 Months Ended
	Mar. 31, 2018
Environmental Remediation Obligations [Abstract]
Environmental	Environmental The Company is subject to environmental laws and regulations worldwide that impose limitations on the discharge of pollutants into the air and water, establish standards for the treatment, storage and disposal of solid and hazardous wastes, and impose record keeping and notification requirements. Failure to timely comply with these laws and regulations may expose the Company to penalties. The Company believes that it is in substantial compliance with all applicable environmental laws and regulations and engages in an ongoing process of updating its controls to mitigate compliance risks. The Company is also subject to retained environmental obligations specified in various contractual agreements arising from the divestiture of certain businesses by the Company or one of its predecessor companies. The components of environmental remediation reserves are as follows: As of As of (In $ millions) Demerger obligations ( Note 18 ) 28 28 Divestiture obligations ( Note 18 ) 18 17 Active sites 15 15 US Superfund sites 12 11 Other environmental remediation reserves 2 2 Total 75 73 Remediation Due to its industrial history and through retained contractual and legal obligations, the Company has the obligation to remediate specific areas on its own sites as well as on divested, demerger, orphan or US Superfund sites (as defined below). In addition, as part of the demerger agreement between the Company and Hoechst AG ("Hoechst"), a specified portion of the responsibility for environmental liabilities from a number of Hoechst divestitures was transferred to the Company ( Note 18 ). Certain of these sites, at which the Company maintains continuing involvement, were and continue to be designated as discontinued operations when closed. The Company provides for such obligations when the event of loss is probable and reasonably estimable. The Company believes that environmental remediation costs will not have a material adverse effect on the financial position of the Company, but may have a material adverse effect on the results of operations or cash flows in any given period. US Superfund Sites In the US, the Company may be subject to substantial claims brought by US federal or state regulatory agencies or private individuals pursuant to statutory authority or common law. In particular, the Company has a potential liability under the US Federal Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended, and related state laws (collectively referred to as "Superfund") for investigation and cleanup costs at certain sites. At most of these sites, numerous companies, including the Company, or one of its predecessor companies, have been notified that the US Environmental Protection Agency ("EPA"), state governing bodies or private individuals consider such companies to be potentially responsible parties ("PRP") under Superfund or related laws. The proceedings relating to these sites are in various stages. The cleanup process has not been completed at most sites, and the status of the insurance coverage for some of these proceedings is uncertain. Consequently, the Company cannot accurately determine its ultimate liability for investigation or cleanup costs at these sites. As events progress at each site for which it has been named a PRP, the Company accrues, as appropriate, a liability for site cleanup. Such liabilities include all costs that are probable and can be reasonably estimated. In establishing these liabilities, the Company considers the contaminants of concern, the potential impact thereof, the relationship of the contaminants of concern to its current and historic operations, its shipment of waste to a site, its percentage of total waste shipped to the site, the types of wastes involved, the conclusions of any studies, the magnitude of any remedial actions that may be necessary and the number and viability of other PRPs. Often the Company joins with other PRPs to sign joint defense agreements that settle, among PRPs, each party's percentage allocation of costs at the site. Although the ultimate liability may differ from the estimate, the Company routinely reviews the liabilities and revises the estimate, as appropriate, based on the most current information available. One such site is the Diamond Alkali Superfund Site, which is comprised of a number of sub-sites, including the Lower Passaic River Study Area, which is the lower 17-mile stretch of the Passaic River ("Lower Passaic River Site"), and the Newark Bay Area. The Company and 70 other companies are parties to a May 2007 Administrative Order on Consent with the EPA to perform a Remedial Investigation/Feasibility Study ("RI/FS") at the Lower Passaic River Site in order to identify the levels of contaminants and potential cleanup actions, including the potential migration of contaminants between the Lower Passaic River Site and the Newark Bay Area. Work on the RI/FS is ongoing, with a goal to complete it in 2018. In March 2016, the EPA issued its final Record of Decision concerning the remediation of the lower 8.3 miles of the Lower Passaic River Site ("Lower 8.3 Miles"). Pursuant to the EPA's Record of Decision, the Lower 8.3 Miles must be dredged bank to bank and an engineered cap must be installed at an EPA estimated cost of approximately $1.4 billion . The Company owned and/or operated facilities in the vicinity of the Lower 8.3 Miles, but has found no evidence that it contributed any of the contaminants of concern to the Passaic River. The Company is vigorously defending this matter and currently believes that its ultimate allocable share of the cleanup costs with respect to the Lower Passaic River Site, estimated at less than 1% , will not be material to the Company's results of operations, cash flows or financial position.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2018
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders' Equity Common Stock The Company's Board of Directors follows a policy of declaring, subject to legally available funds, a quarterly cash dividend on each share of the Company's Series A common stock, par value $0.0001 per share ("Common Stock"), unless the Company's Board of Directors, in its sole discretion, determines otherwise. The Company's Board of Directors approved increases in the Company's Common Stock cash dividend rates as follows: Increase Quarterly Common Stock Cash Dividend Annual Common Stock Cash Dividend Effective Date (In percentages) (In $ per share) April 2017 28 0.46 1.84 May 2017 Treasury Stock Three Months Ended Total From 2018 2017 Shares repurchased — 1,461,966 39,779,019 Average purchase price per share $ — $ 89.95 $ 58.71 Shares repurchased (in $ millions) $ — $ 131 $ 2,335 Aggregate Board of Directors repurchase authorizations during the period (in $ millions) (1) $ — $ — $ 3,866 ______________________________ (1) These authorizations give management discretion in determining the timing and conditions under which shares may be repurchased. This repurchase program began in February 2008 and does not have an expiration date. The purchase of treasury stock reduces the number of shares outstanding. The repurchased shares may be used by the Company for compensation programs utilizing the Company's stock and other corporate purposes. The Company accounts for treasury stock using the cost method and includes treasury stock as a component of stockholders' equity. Other Comprehensive Income (Loss), Net Three Months Ended March 31, 2018 2017 Gross Amount Income Tax (Provision) Benefit Net Amount Gross Amount Income Tax (Provision) Benefit Net (In $ millions) Foreign currency translation 45 4 49 28 — 28 Gain (loss) on cash flow hedges (2 ) 1 (1 ) (2 ) — (2 ) Pension and postretirement benefits 1 — 1 5 — 5 Total 44 5 49 31 — 31 Adjustments to Accumulated other comprehensive income (loss), net, are as follows: Foreign Currency Translation Gain (Loss) on Cash Flow Hedges ( Note 16 ) Pension and Postretirement Benefits ( Note 11 ) Accumulated Other Comprehensive Income (Loss), Net (In $ millions) As of December 31, 2017 (176 ) 2 (3 ) (177 ) Other comprehensive income (loss) before reclassifications 45 (2 ) 1 44 Amounts reclassified from accumulated other comprehensive income (loss) — — — — Income tax (provision) benefit 4 1 — 5 As of March 31, 2018 (127 ) 1 (2 ) (128 )

Other (Charges) Gains, Net

Other (Charges) Gains, Net	3 Months Ended
	Mar. 31, 2018
Restructuring and Related Activities [Abstract]
Other (Charges) Gains, Net	Other (Charges) Gains, Net Three Months Ended March 31, 2018 2017 (In $ millions) Restructuring — (2 ) Plant/office closures — (53 ) Total — (55 ) During the three months ended March 31, 2017 , the Company recorded $2 million of employee termination benefits primarily related to the Company's ongoing efforts to align its businesses around its core value drivers. During the three months ended March 31, 2017 , the Company provided notice of termination of a contract with a key raw materials supplier at its ethanol production unit in Nanjing, China. As a result, the Company recorded an estimated $53 million of plant/office closure costs primarily consisting of a $27 million contract termination charge and an $18 million reduction to its non-income tax receivable. The Nanjing, China ethanol production unit is included in the Company's Acetyl Intermediates segment. The changes in the restructuring reserves by business segment are as follows: Engineered Materials Acetate Tow Industrial Specialties Acetyl Intermediates Other Total (In $ millions) Employee Termination Benefits As of December 31, 2017 1 — — 1 1 3 Additions — — — — — — Cash payments (1 ) — — — — (1 ) Other changes — — — — — — Exchange rate changes — — — — — — As of March 31, 2018 — — — 1 1 2 Other Plant/Office Closures As of December 31, 2017 — — — 2 — 2 Additions — — — — — — Cash payments — — — — — — Other changes — — — — — — Exchange rate changes — — — — — — As of March 31, 2018 — — — 2 — 2 Total — — — 3 1 4

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Three Months Ended 2018 2017 (In percentages) Effective income tax rate 15 23 The lower effective income tax rate for the three months ended March 31, 2018 compared to the same period in 2017 is primarily due to the corporate tax rate reduction in the US from enacted tax legislation commonly referred to as the Tax Cuts and Jobs Act ("TCJA") and decreases in losses in jurisdictions not providing tax benefit. In December 2017, the TCJA was enacted and is effective January 1, 2018. ASC 740, Accounting for Income Taxes , requires companies to recognize the effects of tax law changes in the period of enactment. This overhaul of the US tax law made a number of substantial changes, including the reduction of the corporate tax rate from 35% to 21%, establishing a dividends received deduction for dividends paid by foreign subsidiaries to the US, elimination or limitation of certain deductions (interest, domestic production activities and executive compensation), imposing a mandatory tax on previously unrepatriated earnings accumulated offshore since 1986 and establishing global minimum income tax and base erosion tax provisions related to offshore activities and affiliated party payments. Due to the timing of the new tax law and the substantial changes it brings, the SEC issued Staff Accounting Bulletin No. 118 ("SAB 118"), which provides registrants a measurement period to report the impact of the new US tax law. During the measurement period, provisional amounts for the effects of the law are recorded to the extent a reasonable estimate can be made. To the extent that all information necessary is not available, prepared or analyzed, companies may recognize provisional estimated amounts for a period of up to one year following enactment of the TCJA. For year-end 2017, the Company recorded provisional amounts for impacts of the new tax law including: the deemed repatriation tax on post 1986 accumulated earnings and profits, the deferred tax rate change effect of the new law, gross foreign tax credit carryforwards and related valuation allowances to offset foreign tax credit carryforwards. Certain items or estimates that result in impacts of the TCJA being provisional include: detailed foreign earnings calculations for 2017 and 2018, projected foreign cash balances for certain foreign subsidiaries and finalized computations of foreign tax credit availability. Finally, the Company considers it likely that further technical guidance regarding certain components of the new provisions included in the TCJA, as well as clarity regarding state income tax conformity to current federal tax code, may be issued. During the three months ended March 31, 2018 , the Company recorded increases to provisional amounts for valuation allowances on foreign tax credits of $24 million . The changes in provisional amounts are primarily due to refined estimates of foreign source income and expense apportionment during the credit carryforward period. The Company will continue to refine provisional amounts for the impacts of the TCJA as more refined information and further guidance become available. During the three months ended March 31, 2018 , the Company's uncertain tax positions decreased $5 million , primarily due to favorable technical clarifications in Germany, partially offset by an increase in US positions and foreign currency exchange fluctuations. In connection with the Company's US federal income tax audit for 2009 and 2010, the Company has received $192 million of proposed pre-tax adjustments related to various intercompany charges. In January 2018, the Company received proposed pre-tax adjustments for its 2011 and 2012 audit cycle in the amount of $198 million . In the event the Company is wholly unsuccessful in its defense and absent expected offsetting adjustments from foreign tax authorities, the proposed adjustments would result in the consumption of approximately $136 million of prior foreign tax credit carryforwards, which are substantially offset with a valuation allowance due to uncertain recoverability. The Company believes these proposed adjustments to be without merit and is vigorously defending its position.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments Net Investment Hedges The Company uses derivative instruments, such as foreign currency forwards, and non-derivative financial instruments, such as foreign currency denominated debt, that may give rise to foreign currency transaction gains or losses to hedge the foreign currency exposure of net investments in foreign operations. Accordingly, the effective portion of gains and losses from remeasurement of derivative and non-derivative financial instruments is included in foreign currency translation within Accumulated other comprehensive income (loss), net in the unaudited consolidated balance sheets. Gains and losses are reclassified to earnings in the period the hedged investment is sold or liquidated. The total notional amount of foreign currency denominated debt designated as a net investment hedge of net investments in foreign operations are as follows: As of As of (In € millions) Total 1,050 1,050 Derivatives Not Designated As Hedges Foreign Currency Forwards and Swaps Gross notional values of the foreign currency forwards and swaps not designated as hedges are as follows: As of As of (In $ millions) Total 935 740 Information regarding changes in the fair value of the Company's derivative and non-derivative instruments is as follows: Gain (Loss) Recognized in Other Comprehensive Income (Loss) Gain (Loss) Recognized in Earnings (Loss) Three Months Ended March 31, Statement of Operations Classification 2018 2017 2018 2017 (In $ millions) Designated as Cash Flow Hedges Commodity swaps (2 ) (1 ) — 1 Cost of sales Total (2 ) (1 ) — 1 Designated as Net Investment Hedges Foreign currency denominated debt ( Note 10 ) (35 ) (13 ) — — N/A Total (35 ) (13 ) — — Not Designated as Hedges Foreign currency forwards and swaps — — (4 ) 1 Foreign exchange gain (loss), net; Other income (expense), net Total — — (4 ) 1 See Note 17 for further information regarding the fair value of the Company's derivative instruments. Certain of the Company's commodity swaps and foreign currency forwards and swaps permit the Company to net settle all contracts with the counterparty through a single payment in an agreed upon currency in the event of default or early termination of the contract, similar to a master netting arrangement. Information regarding the gross amounts of the Company's derivative instruments and the amounts offset in the unaudited consolidated balance sheets is as follows: As of As of (In $ millions) Derivative Assets Gross amount recognized 8 13 Gross amount offset in the consolidated balance sheets 5 4 Net amount presented in the consolidated balance sheets 3 9 Gross amount not offset in the consolidated balance sheets 1 3 Net amount 2 6 As of As of (In $ millions) Derivative Liabilities Gross amount recognized 8 7 Gross amount offset in the consolidated balance sheets 5 4 Net amount presented in the consolidated balance sheets 3 3 Gross amount not offset in the consolidated balance sheets 1 3 Net amount 2 —

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company's financial assets and liabilities are measured at fair value on a recurring basis as follows: Derivatives. Derivative financial instruments, including commodity swaps and foreign currency forwards and swaps, are valued in the market using discounted cash flow techniques. These techniques incorporate Level 1 and Level 2 fair value measurement inputs such as spot rates and foreign currency exchange rates. These market inputs are utilized in the discounted cash flow calculation considering the instrument's term, notional amount, discount rate and credit risk. Significant inputs to the derivative valuation for commodity swaps and foreign currency forwards and swaps are observable in the active markets and are classified as Level 2 in the fair value measurement hierarchy. Fair Value Measurement Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Total Balance Sheet Classification (In $ millions) As of March 31, 2018 Derivatives Designated as Cash Flow Hedges Commodity swaps — 1 1 Current Other assets Derivatives Not Designated as Hedges Foreign currency forwards and swaps — 2 2 Current Other assets Total assets — 3 3 Derivatives Not Designated as Hedges Foreign currency forwards and swaps — (3 ) (3 ) Current Other liabilities Total liabilities — (3 ) (3 ) As of December 31, 2017 Derivatives Designated as Cash Flow Hedges Commodity swaps — 2 2 Current Other assets Commodity swaps — 2 2 Noncurrent Other assets Derivatives Not Designated as Hedges Foreign currency forwards and swaps — 5 5 Current Other assets Total assets — 9 9 Derivatives Not Designated as Hedges Foreign currency forwards and swaps — (3 ) (3 ) Current Other liabilities Total liabilities — (3 ) (3 ) Carrying values and fair values of financial instruments that are not carried at fair value are as follows: Fair Value Measurement Carrying Amount Significant Other Observable Inputs (Level 2) Unobservable Inputs (Level 3) Total (In $ millions) As of March 31, 2018 Cost investments 165 — — — Insurance contracts in nonqualified trusts 42 42 — 42 Long-term debt, including current installments of long-term debt 3,424 3,310 194 3,504 As of December 31, 2017 Cost investments 159 — — — Insurance contracts in nonqualified trusts 42 42 — 42 Long-term debt, including current installments of long-term debt 3,398 3,299 208 3,507 In general, the cost investments included in the table above are not publicly traded and their fair values are not readily determinable. As such, the Company believes the carrying values approximate fair value. Insurance contracts in nonqualified trusts consist of long-term fixed income securities, which are valued using independent vendor pricing models with observable inputs in the active market and therefore represent a Level 2 fair value measurement. The fair value of long-term debt is based on valuations from third-party banks and market quotations and is classified as Level 2 in the fair value measurement hierarchy. The fair value of obligations under capital leases, which are included in long-term debt, is based on lease payments and discount rates, which are not observable in the market and therefore represents a Level 3 fair value measurement. As of March 31, 2018 , and December 31, 2017 , the fair values of cash and cash equivalents, receivables, trade payables, short-term borrowings and the current installments of long-term debt approximate carrying values due to the short-term nature of these instruments. These items have been excluded from the table with the exception of the current installments of long-term debt.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Guarantees The Company has agreed to guarantee or indemnify third parties for environmental and other liabilities pursuant to a variety of agreements, including asset and business divestiture agreements, leases, settlement agreements and various agreements with affiliated companies. Although many of these obligations contain monetary and/or time limitations, others do not provide such limitations. The Company has accrued for all probable and reasonably estimable losses associated with all known matters or claims. These known obligations include the following: • Demerger Obligations In connection with the Hoechst demerger, the Company agreed to indemnify Hoechst, and its legal successors, for various liabilities under the demerger agreement, including for environmental liabilities associated with contamination arising either from environmental damage in general ("Category A") or under 19 divestiture agreements entered into by Hoechst prior to the demerger ("Category B") ( Note 12 ). The Company's obligation to indemnify Hoechst, and its legal successors, is capped under Category B at €250 million . If and to the extent the environmental damage should exceed €750 million in aggregate, the Company's obligation to indemnify Hoechst and its legal successors applies, but is then limited to 33.33% of the remediation cost without further limitations. Cumulative payments under the divestiture agreements as of March 31, 2018 , are $82 million . Most of the divestiture agreements have become time barred and/or any notified environmental damage claims have been partially settled. The Company has also undertaken in the demerger agreement to indemnify Hoechst and its legal successors for (i) 33.33% of any and all Category A liabilities that result from Hoechst being held as the responsible party pursuant to public law or current or future environmental law or by third parties pursuant to private or public law related to contamination and (ii) liabilities that Hoechst is required to discharge, including tax liabilities, which are associated with businesses that were included in the demerger but were not demerged due to legal restrictions on the transfers of such items. These indemnities do not provide for any monetary or time limitations. The Company has not been requested by Hoechst to make any payments in connection with this indemnification. Accordingly, the Company has not made any payments to Hoechst and its legal successors. Based on the Company's evaluation of currently available information, including the lack of requests for indemnification, the Company cannot estimate the Possible Loss for the remaining demerger obligations, if any, in excess of amounts accrued. • Divestiture Obligations The Company and its predecessor companies agreed to indemnify third-party purchasers of former businesses and assets for various pre-closing conditions, as well as for breaches of representations, warranties and covenants. Such liabilities also include environmental liability, product liability, antitrust and other liabilities. These indemnifications and guarantees represent standard contractual terms associated with typical divestiture agreements and, other than environmental liabilities, the Company does not believe that they expose the Company to significant risk ( Note 12 ). The Company has divested numerous businesses, investments and facilities through agreements containing indemnifications or guarantees to the purchasers. Many of the obligations contain monetary and/or time limitations, which extend through 2037 . The aggregate amount of outstanding indemnifications and guarantees provided for under these agreements is $123 million as of March 31, 2018 . Other agreements do not provide for any monetary or time limitations. Based on the Company's evaluation of currently available information, including the number of requests for indemnification or other payment received by the Company, the Company cannot estimate the Possible Loss for the remaining divestiture obligations, if any, in excess of amounts accrued. Purchase Obligations In the normal course of business, the Company enters into various purchase commitments for goods and services. The Company maintains a number of "take-or-pay" contracts for purchases of raw materials, utilities and other services. Certain of the contracts contain a contract termination buy-out provision that allows for the Company to exit the contracts for amounts less than the remaining take-or-pay obligations. Additionally, the Company has other outstanding commitments representing maintenance and service agreements, energy and utility agreements, consulting contracts and software agreements. As of March 31, 2018 , the Company had unconditional purchase obligations of $1.7 billion , which extend through 2036 . Contingencies The Company is involved in legal and regulatory proceedings, lawsuits, claims and investigations incidental to the normal conduct of business, relating to such matters as product liability, land disputes, insurance coverage disputes, commercial contracts, employment, antitrust or competition compliance, intellectual property, personal injury and other actions in tort, workers' compensation, chemical exposure, asbestos exposure, taxes, trade compliance, acquisitions and divestitures, claims of legacy stockholders, past waste disposal practices and release of chemicals into the environment. The Company is actively defending those matters where the Company is named as a defendant and, based on the current facts, does not believe the outcomes from these matters will be material to the Company's results of operations, cash flows or financial position. European Commission In May 2017, the Company learned that the European Commission opened a competition law investigation involving certain subsidiaries of the Company with respect to certain ethylene purchases. The Company is cooperating with the European Commission. Because the investigation is on-going and the many uncertainties and variables involved, the Company is unable at this time to determine the outcome of this investigation and whether, and in what amount, any potential fines would be assessed.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information Effective January 1, 2018, the Company reorganized its operating and reportable segments to align with recent structural and management reporting changes. The change reflects the movement of its food ingredients business from the Consumer Specialties reportable segment into the Engineered Materials reportable segment. The former Consumer Specialties reportable segment was renamed the Acetate Tow segment, and the former Advanced Engineered Materials reportable segment was renamed the Engineered Materials segment. This reorganization better reflects how the Company manages its food ingredients' related products commercially. Engineered Materials and food ingredients are both project-based models which focus on delivering customized solutions and are led by the same senior management team. Engineered Materials Acetate Tow Industrial Specialties Acetyl Intermediates Other Activities Eliminations Consolidated (In $ millions) Three Months Ended March 31, 2018 Net sales 665 168 274 (1) 871 (2) — (127 ) 1,851 Other (charges) gains, net ( Note 14 ) — — — — — — — Operating profit (loss) 127 46 23 231 (83 ) (1 ) 343 Equity in net earnings (loss) of affiliates 54 — — 1 3 — 58 Depreciation and amortization 32 10 9 26 2 — 79 Capital expenditures 21 — 4 30 2 — 57 (3) As of March 31, 2018 Goodwill and intangible assets, net 1,035 155 46 207 — — 1,443 Total assets 4,111 1,063 834 2,680 1,092 — 9,780 Three Months Ended March 31, 2017 - As Adjusted ( Note 2 ) Net sales 514 191 245 (1) 619 (2) — (98 ) 1,471 Other (charges) gains, net ( Note 14 ) — (1 ) — (53 ) (1 ) — (55 ) Operating profit (loss) 104 62 25 27 (48 ) — 170 Equity in net earnings (loss) of affiliates 43 — — 1 3 — 47 Depreciation and amortization 25 10 8 26 2 — 71 Capital expenditures 10 6 4 20 1 — 41 (3) As of December 31, 2017 Goodwill and intangible assets, net 902 154 46 202 — — 1,304 Total assets 3,866 1,163 861 2,657 991 — 9,538 ______________________________ (1) Includes intersegment sales of $2 million and $1 million for the three months ended March 31, 2018 and 2017 , respectively. (2) Includes intersegment sales of $125 million and $97 million for the three months ended March 31, 2018 and 2017 , respectively. (3) Includes a decrease in accrued capital expenditures of $29 million and $21 million for the three months ended March 31, 2018 and 2017 , respectively.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Revenue	Revenue Recognition Accounting Policies Revenue is recognized when performance obligations under the terms of a contract with a customer are satisfied. The majority of the Company's contracts have a single performance obligation to transfer products. Accordingly, the Company recognizes revenue when title and risk of loss have been transferred to the customer, generally at the time of shipment of products. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring products and is generally based upon a negotiated, formula, list or fixed price. The Company sells its products both directly to customers and through distributors generally under agreements with payment terms typically less than 90 days. The Company has elected to account for shipping and handling as activities to fulfill the promise to transfer the good. As such, shipping and handling fees billed to customers in a sales transaction are recorded in Net sales and shipping and handling costs incurred are recorded in Cost of sales. The Company has elected to exclude from Net sales any value add, sales and other taxes which it collects concurrent with revenue-producing activities. These accounting policy elections are consistent with the manner in which the Company historically recorded shipping and handling fees and taxes. The adoption of ASU 2014-09 resulted in an immaterial impact to the individual financial statement line items of the Company's unaudited interim consolidated statement of operations during the three months ended March 31, 2017 . Contract Estimates The nature of certain of the Company's contracts gives rise to variable consideration, which may be constrained, including retrospective volume-based rebates to certain customers. The Company issues retrospective volume-based rebates to customers when they purchase a certain volume level, and the rebates are applied retroactively to prior purchases. The Company also issues prospective volume-based rebates to customers when they purchase a certain volume level, and the rebates are applied to future purchases. Prospective volume-based rebates represent a material right within the contract and therefore are considered to be separate performance obligations. For both retrospective and prospective volume-based rebates, the Company estimates the level of volumes based on anticipated purchases at the beginning of the period and records a rebate accrual for each purchase toward the requisite rebate volume. These estimated rebates are included in the transaction price of the Company's contracts with customers as a reduction to Net sales and are included in Current Other liabilities in the Consolidated Balance Sheets ( Note 8 ). This methodology is consistent with the manner in which the Company historically estimated and recorded volume-based rebates. The majority of the Company's revenue is derived from contracts (i) with an original expected length of one year or less and (ii) contracts for which it recognizes revenue at the amount in which it has the right to invoice as product is delivered. The Company has elected the practical expedient not to disclose the value of remaining performance obligations associated with these types of contracts. However, the Company has certain contracts that represent take-or-pay revenue arrangements in which the Company's performance obligations extend over multiple years. As of March 31, 2018 , the Company had $910 million of remaining performance obligations related to take-or-pay contracts. The Company expects to recognize approximately $198 million of its remaining performance obligations as Net sales in 2018, $220 million in 2019, an additional $ 180 million in 2020 and the balance thereafter. The Company has certain contracts which contain performance obligations which are immaterial in the context of the contract with the customer. The Company has elected the practical expedient not to assess whether these promised goods or services are performance obligations. Contract Balances Contract liabilities primarily relate to advances or deposits received from the Company's customers before revenue is recognized. These amounts are recorded as deferred revenue and are included in Noncurrent Other liabilities in the Consolidated Balance Sheets ( Note 9 ). The Company does not have any material contract assets as of March 31, 2018. Disaggregated Revenue In general, the Company's business segmentation is aligned according to the nature and economic characteristics of its products and customer relationships and provides meaningful disaggregation of each business segment's results of operations. The Company manages its Engineered Materials business segment through its project management pipeline, which is comprised of a broad range of projects which are solutions-based and are tailored to each customers' unique needs. Projects are identified and selected based on success rate and may involve a number of different polymers per project for use in multiple end-use applications. Therefore, the Company is agnostic toward products and end-use markets for the Engineered Materials business segment. Within the Acetate Tow business segment, the Company's primary product is acetate tow, which is managed through contracts with a few major tobacco companies and accounts for a significant amount of filters used in cigarette production worldwide. The Company manages its Industrial Specialties and Acetyl Intermediates business segments by leveraging its ability to sell chemicals upstream to end-use markets or downstream to its emulsion polymers business (within its Industrial Specialties segment). Decisions to sell upstream and geographically or downstream and along the acetyl chain are based on market demand, trade flows and maximizing the value of its chemicals. Therefore, the Company's strategic focus is on executing within this integrated chain model and less on driving product-specific revenue. Further disaggregation of Net sales by business segment and geographic destination is as follows: Three Months Ended 2018 (In $ millions) Engineered Materials North America 179 Europe and Africa 337 Asia-Pacific 132 South America 17 Total 665 Acetate Tow North America 35 Europe and Africa 70 Asia-Pacific 51 South America 12 Total 168 Industrial Specialties North America 88 Europe and Africa 136 Asia-Pacific 44 South America 4 Total (1) 272 Acetyl Intermediates North America 202 Europe and Africa 181 Asia-Pacific 334 South America 29 Total (2) 746 ______________________________ (1) Excludes intersegment sales of $2 million for the three months ended March 31, 2018 . (2) Excludes intersegment sales of $125 million for the three months ended March 31, 2018 .

Earnings (Loss) Per Share

Earnings (Loss) Per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings (Loss) Per Share	Earnings (Loss) Per Share Three Months Ended 2018 2017 (In $ millions, except share data) Amounts attributable to Celanese Corporation Earnings (loss) from continuing operations 365 183 Earnings (loss) from discontinued operations (2 ) — Net earnings (loss) 363 183 Weighted average shares - basic 135,916,446 140,643,860 Incremental shares attributable to equity awards 467,289 353,543 Weighted average shares - diluted 136,383,735 140,997,403 During the three months ended March 31, 2018 and 2017 , there were no anti-dilutive equity awards excluded from the computation of diluted net earnings per share.

Consolidating Guarantor Financi

Consolidating Guarantor Financial Information	3 Months Ended
	Mar. 31, 2018
Consolidating Guarantor Financial Information [Abstract]
Consolidating Guarantor Financial Information	Consolidating Guarantor Financial Information The Senior Notes were issued by Celanese US ("Issuer") and are guaranteed by Celanese Corporation ("Parent Guarantor") and the Subsidiary Guarantors ( Note 10 ). The Issuer and Subsidiary Guarantors are 100% owned subsidiaries of the Parent Guarantor. The Parent Guarantor and Subsidiary Guarantors have guaranteed the Notes fully and unconditionally and jointly and severally. For cash management purposes, the Company transfers cash between the Parent Guarantor, Issuer, Subsidiary Guarantors and non-guarantors through intercompany financing arrangements, contributions or declaration of dividends between the respective parent and its subsidiaries. The transfer of cash under these activities facilitates the ability of the recipient to make specified third-party payments for principal and interest on the Company's outstanding debt, Common Stock dividends and Common Stock repurchases. The unaudited interim consolidating statements of cash flows for the three months ended March 31, 2018 and 2017 present such intercompany financing activities, contributions and dividends consistent with how such activity would be presented in a stand-alone statement of cash flows. The Company has not presented separate financial information and other disclosures for each of its Subsidiary Guarantors because it believes such financial information and other disclosures would not provide investors with any additional information that would be material in evaluating the sufficiency of the guarantees. The unaudited interim consolidating financial statements for the Parent Guarantor, the Issuer, the Subsidiary Guarantors and the non-guarantors are as follows: CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED INTERIM CONSOLIDATING STATEMENT OF OPERATIONS Three Months Ended March 31, 2018 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net sales — — 600 1,554 (303 ) 1,851 Cost of sales — — (464 ) (1,178 ) 306 (1,336 ) Gross profit — — 136 376 3 515 Selling, general and administrative expenses — — (60 ) (87 ) — (147 ) Amortization of intangible assets — — (2 ) (4 ) — (6 ) Research and development expenses — — (8 ) (10 ) — (18 ) Other (charges) gains, net — — — — — — Foreign exchange gain (loss), net — — — (1 ) — (1 ) Gain (loss) on disposition of businesses and assets, net — — (2 ) 2 — — Operating profit (loss) — — 64 276 3 343 Equity in net earnings (loss) of affiliates 363 360 267 53 (985 ) 58 Non-operating pension and other postretirement employee benefit (expense) income — — 23 3 — 26 Interest expense — (5 ) (29 ) (9 ) 10 (33 ) Interest income — 8 2 2 (10 ) 2 Dividend income - cost investments — — — 32 — 32 Other income (expense), net — 1 1 2 — 4 Earnings (loss) from continuing operations before tax 363 364 328 359 (982 ) 432 Income tax (provision) benefit — (1 ) (37 ) (27 ) — (65 ) Earnings (loss) from continuing operations 363 363 291 332 (982 ) 367 Earnings (loss) from operation of discontinued operations — — — (2 ) — (2 ) Income tax (provision) benefit from discontinued operations — — — — — — Earnings (loss) from discontinued operations — — — (2 ) — (2 ) Net earnings (loss) 363 363 291 330 (982 ) 365 Net (earnings) loss attributable to noncontrolling interests — — — (2 ) — (2 ) Net earnings (loss) attributable to Celanese Corporation 363 363 291 328 (982 ) 363 CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED INTERIM CONSOLIDATING STATEMENT OF OPERATIONS Three Months Ended March 31, 2017 - As Adjusted ( Note 2 ) Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net sales — — 589 1,177 (295 ) 1,471 Cost of sales — — (445 ) (966 ) 290 (1,121 ) Gross profit — — 144 211 (5 ) 350 Selling, general and administrative expenses — — (34 ) (69 ) — (103 ) Amortization of intangible assets — — (1 ) (3 ) — (4 ) Research and development expenses — — (7 ) (10 ) — (17 ) Other (charges) gains, net — — (6 ) (49 ) — (55 ) Foreign exchange gain (loss), net — — — — — — Gain (loss) on disposition of businesses and assets, net — — (2 ) 1 — (1 ) Operating profit (loss) — — 94 81 (5 ) 170 Equity in net earnings (loss) of affiliates 183 174 101 43 (454 ) 47 Non-operating pension and other postretirement employee benefit (expense) income — — 20 2 — 22 Interest expense — (6 ) (23 ) (7 ) 7 (29 ) Interest income — 6 1 — (7 ) — Dividend income - cost investments — — — 29 — 29 Other income (expense), net — — — 1 — 1 Earnings (loss) from continuing operations before tax 183 174 193 149 (459 ) 240 Income tax (provision) benefit — 9 (63 ) 1 (3 ) (56 ) Earnings (loss) from continuing operations 183 183 130 150 (462 ) 184 Earnings (loss) from operation of discontinued operations — — — — — — Income tax (provision) benefit from discontinued operations — — — — — — Earnings (loss) from discontinued operations — — — — — — Net earnings (loss) 183 183 130 150 (462 ) 184 Net (earnings) loss attributable to noncontrolling interests — — — (1 ) — (1 ) Net earnings (loss) attributable to Celanese Corporation 183 183 130 149 (462 ) 183 CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED INTERIM CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2018 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net earnings (loss) 363 363 291 330 (982 ) 365 Other comprehensive income (loss), net of tax Foreign currency translation 49 49 63 74 (186 ) 49 Gain (loss) on cash flow hedges (1 ) (1 ) (1 ) (1 ) 3 (1 ) Pension and postretirement benefits 1 1 1 1 (3 ) 1 Total other comprehensive income (loss), net of tax 49 49 63 74 (186 ) 49 Total comprehensive income (loss), net of tax 412 412 354 404 (1,168 ) 414 Comprehensive (income) loss attributable to noncontrolling interests — — — (2 ) — (2 ) Comprehensive income (loss) attributable to Celanese Corporation 412 412 354 402 (1,168 ) 412 Three Months Ended March 31, 2017 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net earnings (loss) 183 183 130 150 (462 ) 184 Other comprehensive income (loss), net of tax Foreign currency translation 28 28 30 39 (97 ) 28 Gain (loss) on cash flow hedges (2 ) (2 ) (2 ) (2 ) 6 (2 ) Pension and postretirement benefits 5 5 4 6 (15 ) 5 Total other comprehensive income (loss), net of tax 31 31 32 43 (106 ) 31 Total comprehensive income (loss), net of tax 214 214 162 193 (568 ) 215 Comprehensive (income) loss attributable to noncontrolling interests — — — (1 ) — (1 ) Comprehensive income (loss) attributable to Celanese Corporation 214 214 162 192 (568 ) 214 CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED CONSOLIDATING BALANCE SHEET As of March 31, 2018 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) ASSETS Current Assets Cash and cash equivalents — 2 111 377 — 490 Trade receivables - third party and affiliates — — 160 1,209 (164 ) 1,205 Non-trade receivables, net 38 486 301 441 (995 ) 271 Inventories, net — — 281 719 (45 ) 955 Marketable securities, at fair value — — 32 — — 32 Other assets — 14 8 55 (24 ) 53 Total current assets 38 502 893 2,801 (1,228 ) 3,006 Investments in affiliates 3,215 4,461 4,140 861 (11,698 ) 979 Property, plant and equipment, net — — 1,181 2,620 — 3,801 Deferred income taxes — 14 12 159 (3 ) 182 Other assets — 1,519 214 153 (1,517 ) 369 Goodwill — — 399 708 — 1,107 Intangible assets, net — — 82 254 — 336 Total assets 3,253 6,496 6,921 7,556 (14,446 ) 9,780 LIABILITIES AND EQUITY Current Liabilities Short-term borrowings and current installments of long-term debt - third party and affiliates — 83 151 466 (275 ) 425 Trade payables - third party and affiliates — — 288 673 (164 ) 797 Other liabilities — 38 264 217 (253 ) 266 Income taxes payable — — 501 103 (490 ) 114 Total current liabilities — 121 1,204 1,459 (1,182 ) 1,602 Noncurrent Liabilities Long-term debt — 3,160 1,476 231 (1,524 ) 3,343 Deferred income taxes — — — 223 (4 ) 219 Uncertain tax positions — — 9 145 (2 ) 152 Benefit obligations — — 273 309 — 582 Other liabilities — — 55 162 — 217 Total noncurrent liabilities — 3,160 1,813 1,070 (1,530 ) 4,513 Total Celanese Corporation stockholders' equity 3,253 3,215 3,904 4,615 (11,734 ) 3,253 Noncontrolling interests — — — 412 — 412 Total equity 3,253 3,215 3,904 5,027 (11,734 ) 3,665 Total liabilities and equity 3,253 6,496 6,921 7,556 (14,446 ) 9,780 CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED CONSOLIDATING BALANCE SHEET As of December 31, 2017 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) ASSETS Current Assets Cash and cash equivalents — — 230 346 — 576 Trade receivables - third party and affiliates — — 89 988 (91 ) 986 Non-trade receivables, net 38 482 279 385 (940 ) 244 Inventories, net — — 277 672 (49 ) 900 Marketable securities, at fair value — — 32 — — 32 Other assets — 60 12 93 (111 ) 54 Total current assets 38 542 919 2,484 (1,191 ) 2,792 Investments in affiliates 2,850 4,283 3,916 861 (10,934 ) 976 Property, plant and equipment, net — — 1,145 2,617 — 3,762 Deferred income taxes — 6 206 158 (4 ) 366 Other assets — 1,295 171 165 (1,293 ) 338 Goodwill — — 314 689 — 1,003 Intangible assets, net — — 48 253 — 301 Total assets 2,888 6,126 6,719 7,227 (13,422 ) 9,538 LIABILITIES AND EQUITY Current Liabilities Short-term borrowings and current installments of long-term debt - third party and affiliates — 76 148 369 (267 ) 326 Trade payables - third party and affiliates — 1 300 598 (92 ) 807 Other liabilities — 71 302 273 (292 ) 354 Income taxes payable — — 471 92 (491 ) 72 Total current liabilities — 148 1,221 1,332 (1,142 ) 1,559 Noncurrent Liabilities Long-term debt — 3,128 1,254 233 (1,300 ) 3,315 Deferred income taxes — — — 215 (4 ) 211 Uncertain tax positions — — 1 157 (2 ) 156 Benefit obligations — — 277 308 — 585 Other liabilities — — 255 158 — 413 Total noncurrent liabilities — 3,128 1,787 1,071 (1,306 ) 4,680 Total Celanese Corporation stockholders' equity 2,888 2,850 3,711 4,412 (10,974 ) 2,887 Noncontrolling interests — — — 412 — 412 Total equity 2,888 2,850 3,711 4,824 (10,974 ) 3,299 Total liabilities and equity 2,888 6,126 6,719 7,227 (13,422 ) 9,538 CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED INTERIM CONSOLIDATING STATEMENT OF CASH FLOWS Three Months Ended March 31, 2018 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net cash provided by (used in) operating activities 63 277 (33 ) 170 (334 ) 143 Investing Activities Capital expenditures on property, plant and equipment — — (54 ) (32 ) — (86 ) Acquisitions, net of cash acquired — — (144 ) — — (144 ) Proceeds from sale of businesses and assets, net — — — 9 — 9 Return of capital from subsidiary — — 211 — (211 ) — Contributions to subsidiary — — (16 ) — 16 — Intercompany loan receipts (disbursements) — (222 ) (15 ) — 237 — Other, net — — (3 ) (11 ) — (14 ) Net cash provided by (used in) investing activities — (222 ) (21 ) (34 ) 42 (235 ) Financing Activities Net change in short-term borrowings with maturities of 3 months or less — 15 2 99 (15 ) 101 Proceeds from short-term borrowings — — — 36 — 36 Repayments of short-term borrowings — — — (38 ) — (38 ) Proceeds from long-term debt — — 222 — (222 ) — Repayments of long-term debt — (6 ) (12 ) (13 ) — (31 ) Purchases of treasury stock, including related fees — — — — — — Dividends to parent — (62 ) (272 ) — 334 — Contributions from parent — — — 16 (16 ) — Series A common stock dividends (63 ) — — — — (63 ) Return of capital to parent — — — (211 ) 211 — (Distributions to) contributions from noncontrolling interests — — — (2 ) — (2 ) Other, net — — (5 ) — — (5 ) Net cash provided by (used in) financing activities (63 ) (53 ) (65 ) (113 ) 292 (2 ) Exchange rate effects on cash and cash equivalents — — — 8 — 8 Net increase (decrease) in cash and cash equivalents — 2 (119 ) 31 — (86 ) Cash and cash equivalents as of beginning of period — — 230 346 — 576 Cash and cash equivalents as of end of period — 2 111 377 — 490 CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED INTERIM CONSOLIDATING STATEMENT OF CASH FLOWS Three Months Ended March 31, 2017 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net cash provided by (used in) operating activities 179 196 210 130 (523 ) 192 Investing Activities Capital expenditures on property, plant and equipment — — (42 ) (20 ) — (62 ) Acquisitions, net of cash acquired — (11 ) — — 11 — Proceeds from sale of businesses and assets, net — — — 12 (11 ) 1 Return of capital from subsidiary — — 5 — (5 ) — Contributions to subsidiary — — — — — — Intercompany loan receipts (disbursements) — — 7 — (7 ) — Other, net — — — (3 ) — (3 ) Net cash provided by (used in) investing activities — (11 ) (30 ) (11 ) (12 ) (64 ) Financing Activities Net change in short-term borrowings with maturities of 3 months or less — (7 ) 6 — 7 6 Proceeds from short-term borrowings — — — 7 — 7 Repayments of short-term borrowings — — — (29 ) — (29 ) Proceeds from long-term debt — — — — — — Repayments of long-term debt — — — (53 ) — (53 ) Purchases of treasury stock, including related fees (128 ) — — — — (128 ) Dividends to parent — (178 ) (165 ) (180 ) 523 — Contributions from parent — — — — — — Series A common stock dividends (51 ) — — — — (51 ) Return of capital to parent — — — (5 ) 5 — (Distributions to) contributions from noncontrolling interests — — — (4 ) — (4 ) Other, net — — (16 ) (2 ) — (18 ) Net cash provided by (used in) financing activities (179 ) (185 ) (175 ) (266 ) 535 (270 ) Exchange rate effects on cash and cash equivalents — — — 5 — 5 Net increase (decrease) in cash and cash equivalents — — 5 (142 ) — (137 ) Cash and cash equivalents as of beginning of period — — 51 587 — 638 Cash and cash equivalents as of end of period — — 56 445 — 501

Description of the Company an30

Description of the Company and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Estimates and Assumptions	Estimates and Assumptions The preparation of unaudited interim consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the unaudited interim consolidated financial statements and the reported amounts of Net sales, expenses and allocated charges during the reporting period. Significant estimates pertain to impairments of goodwill, intangible assets and other long-lived assets, purchase price allocations, restructuring costs and other (charges) gains, net, income taxes, pension and other postretirement benefits, asset retirement obligations, environmental liabilities and loss contingencies, among others. Actual results could differ from those estimates.

Revenue Recognition (Policies)

Revenue Recognition (Policies)	3 Months Ended
	Mar. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Revenue Recognition, Policy [Policy Text Block]	Accounting Policies Revenue is recognized when performance obligations under the terms of a contract with a customer are satisfied. The majority of the Company's contracts have a single performance obligation to transfer products. Accordingly, the Company recognizes revenue when title and risk of loss have been transferred to the customer, generally at the time of shipment of products. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring products and is generally based upon a negotiated, formula, list or fixed price. The Company sells its products both directly to customers and through distributors generally under agreements with payment terms typically less than 90 days. The Company has elected to account for shipping and handling as activities to fulfill the promise to transfer the good. As such, shipping and handling fees billed to customers in a sales transaction are recorded in Net sales and shipping and handling costs incurred are recorded in Cost of sales. The Company has elected to exclude from Net sales any value add, sales and other taxes which it collects concurrent with revenue-producing activities. These accounting policy elections are consistent with the manner in which the Company historically recorded shipping and handling fees and taxes. The adoption of ASU 2014-09 resulted in an immaterial impact to the individual financial statement line items of the Company's unaudited interim consolidated statement of operations during the three months ended March 31, 2017 .

Recent Accounting Pronounceme32

Recent Accounting Pronouncements - (Tables)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following table provides a brief description of recent Accounting Standard Updates ("ASU") issued by the Financial Accounting Standards Board ("FASB"): Standard Description Effective Date Effect on the Financial Statements or Other Significant Matters In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The new guidance allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act and will improve the usefulness of information reported to financial statement users. January 1, 2019. Early adoption is permitted. The Company is currently evaluating the impact of adoption on its financial statements and related disclosures. In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities. The new guidance improves the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. January 1, 2019. Early adoption is permitted. The Company adopted the new guidance effective January 1, 2018, as part of the FASB's simplification initiative. The adoption of the new guidance did not have a material impact to the Company. In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The new guidance clarifies the presentation and classification of the components of net periodic benefit costs in the consolidated statement of operations. January 1, 2018. The Company adopted the new guidance effective January 1, 2018, using the retrospective transition method, as part of the FASB's simplification initiative. See Adoption of ASU 2017-07 section below for additional information. In October 2016, the FASB issued ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory. The new guidance requires the income tax consequences of an intra-entity transfer of assets other than inventory to be recognized when the transfer occurs rather than deferring until an outside sale has occurred. January 1, 2018. The Company adopted the new guidance effective January 1, 2018, as part of the FASB's simplification initiative. The adoption of the new guidance did not have a material impact to the Company. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments. The new guidance clarifies the presentation and classification of certain cash receipts and cash payments in the statement of cash flows. January 1, 2018. The Company adopted the new guidance effective January 1, 2018, as part of the FASB's simplification initiative. The adoption of the new guidance did not have a material impact to the Company. In February 2016, the FASB issued ASU 2016-02, Leases. The new guidance supersedes the lease guidance under FASB Accounting Standards Codification ("ASC") Topic 840, Leases, resulting in the creation of FASB ASC Topic 842, Leases. The guidance requires a lessee to recognize in the statement of financial position a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term for both finance and operating leases. January 1, 2019. Early adoption is permitted. The Company is currently evaluating its population of leases, and is continuing to assess all potential impacts of the standard, but currently believes the most significant impact relates to its accounting for manufacturing and logistics equipment, and real estate operating leases. The Company anticipates recognition of additional assets and corresponding liabilities related to leases upon adoption, but has not yet quantified these at this time. The Company plans to adopt the standard effective January 1, 2019, but has not yet selected a transition method. Standard Description Effective Date Effect on the Financial Statements or Other Significant Matters In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. The new guidance updates certain aspects of recognition, measurement, presentation and disclosure of financial instruments. January 1, 2018. The Company adopted the new guidance effective January 1, 2018, using the modified retrospective approach, as part of the FASB's simplification initiative. The new guidance resulted in a cumulative-effect adjustment of less than $1 million to January 1, 2018 Retained earnings. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. Since that date, the FASB has issued additional ASUs clarifying certain aspects of ASU 2014-09. The new guidance requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The new guidance provides alternative methods of adoption. Subsequent guidance issued after May 2014 did not change the core principle of ASU 2014-09. January 1, 2018. The Company adopted the new guidance effective January 1, 2018, using the modified retrospective approach, as part of the FASB's simplification initiative. The adoption of the new guidance resulted in less than $1 million impact to the consolidated financial statements and related disclosures (See Note 20 ).
Schedule of Error Corrections and Prior Period Adjustments		The adoption of this accounting standard resulted in a change in certain previously reported amounts, as follows: Three Months Ended March 31, 2017 As previously reported Adoption of ASU 2017-07 As Adjusted (In $ millions) Cost of sales (1,119 ) (2 ) (1,121 ) Selling, general and administrative expenses (83 ) (20 ) (103 ) Operating profit (loss) 192 (22 ) 170 Non-operating pension and other postretirement employee benefit (expense) income — 22 22

Acquisitions, Dispositions an33

Acquisitions, Dispositions and Plant Closures (Tables)	3 Months Ended
	Mar. 31, 2018
Acquisitions, Dispositions and Plant Closures [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The preliminary purchase price allocation for the Omni Plastics acquisition is as follows: As of February 1, 2018 (In $ millions) Cash and cash equivalents 2 Trade receivables - third party and affiliates 12 Inventories 13 Property, plant and equipment, net 19 Intangible assets ( Note 7 ) 35 Goodwill (1) ( Note 7 ) 84 Other assets 1 Total fair value of assets acquired 166 Trade payables - third party and affiliates (8 ) Total debt (12 ) Total fair value of liabilities assumed (20 ) Net assets acquired 146 ______________________________ (1) Goodwill consists of expected revenue and operating synergies resulting from the acquisition, all of which is deductible for income tax purposes.

Ventures and Variable Interes34

Ventures and Variable Interest Entities (Tables)	3 Months Ended
	Mar. 31, 2018
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Schedule of Variable Interest Entities	The carrying amount of the assets and liabilities associated with Fairway included in the unaudited consolidated balance sheets are as follows: As of As of (In $ millions) Cash and cash equivalents 18 19 Trade receivables, net - third party & affiliate 9 9 Non-trade receivables, net 1 — Property, plant and equipment (net of accumulated depreciation - 2018: $100; 2017: $90) 689 697 Intangible assets (net of accumulated amortization - 2018: $3; 2017: $2) 25 25 Other assets 7 6 Total assets (1) 749 756 Trade payables 7 16 Other liabilities (2) 5 4 Total debt 5 5 Deferred income taxes 3 3 Total liabilities 20 28 ______________________________ (1) Assets can only be used to settle the obligations of Fairway. (2) Primarily represents amounts owed by Fairway to the Company for reimbursement of expenditures.
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Schedule of Variable Interest Entities	The carrying amount of the assets and liabilities associated with the obligations to nonconsolidated VIEs, as well as the maximum exposure to loss relating to these nonconsolidated VIEs are as follows: As of As of (In $ millions) Property, plant and equipment, net 49 53 Trade payables 33 25 Current installments of long-term debt 13 18 Long-term debt 74 76 Total liabilities 120 119 Maximum exposure to loss 165 164 The difference between the total liabilities associated with obligations to nonconsolidated VIEs and the maximum exposure to loss primarily represents take-or-pay obligations for services included in the Company's unconditional purchase obligations ( Note 18 ).

Marketable Securities, at Fai35

Marketable Securities, at Fair Value (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities	The Company's nonqualified trusts hold available-for-sale securities for funding requirements of the Company's nonqualified pension plans ( Note 11 ) as follows: As of As of (In $ millions) Amortized cost 32 32 Gross unrealized gain — — Gross unrealized loss — — Fair value 32 32

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Schedule of Inventories	As of As of (In $ millions) Finished goods 610 591 Work-in-process 58 57 Raw materials and supplies 287 252 Total 955 900

Goodwill and Intangible Asset37

Goodwill and Intangible Assets, net (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	Engineered Materials Acetate Tow Industrial Specialties Acetyl Intermediates Total (In $ millions) As of December 31, 2017 643 149 40 171 1,003 Acquisitions ( Note 3 ) 84 — — — 84 Exchange rate changes 14 1 — 5 20 As of March 31, 2018 (1) 741 150 40 176 1,107 ______________________________ (1) There were $0 million of accumulated impairment losses as of March 31, 2018 .
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Finite-lived intangible assets are as follows: Licenses Customer- Related Intangible Assets Developed Technology Covenants Not to Compete and Other Total (In $ millions) Gross Asset Value As of December 31, 2017 38 640 45 54 777 Acquisitions ( Note 3 ) — 32 — 3 35 (1) Exchange rate changes 1 14 1 — 16 As of March 31, 2018 39 686 46 57 828 Accumulated Amortization As of December 31, 2017 (33 ) (496 ) (30 ) (32 ) (591 ) Amortization — (4 ) (1 ) (1 ) (6 ) Exchange rate changes (1 ) (10 ) (1 ) — (12 ) As of March 31, 2018 (34 ) (510 ) (32 ) (33 ) (609 ) Net book value 5 176 14 24 219 ______________________________ (1) Represents intangible assets acquired related to Omni Plastics ( Note 3 ) with a weighted average amortization period of 11 years .
Schedule of Indefinite-Lived Intangible Assets [Table Text Block]	Indefinite-lived intangible assets are as follows: Trademarks and Trade Names (In $ millions) As of December 31, 2017 115 Acquisitions ( Note 3 ) — Accumulated impairment losses — Exchange rate changes 2 As of March 31, 2018 117
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Estimated amortization expense for the succeeding five fiscal years is as follows: (In $ millions) 2019 21 2020 19 2021 18 2022 17 2023 15

Current Other Liabilities (Tabl

Current Other Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Other Liabilities, Current [Abstract]
Schedule of Current Other Liabilities	As of As of (In $ millions) Asset retirement obligations 11 19 Benefit obligations ( Note 11 ) 30 30 Customer rebates 46 65 Derivatives ( Note 16 ) 3 3 Environmental ( Note 12 ) 18 14 Insurance 4 5 Interest 25 17 Restructuring ( Note 14 ) 4 5 Salaries and benefits 65 113 Sales and use tax/foreign withholding tax payable 19 16 Other 41 67 Total 266 354

Noncurrent Other Liabilities (T

Noncurrent Other Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Other Liabilities, Noncurrent [Abstract]
Schedule of Noncurrent Other Liabilities	As of As of (In $ millions) Asset retirement obligations 7 7 Deferred proceeds 48 47 Deferred revenue 6 6 Environmental ( Note 12 ) 57 59 Income taxes payable — 197 Insurance 43 43 Other 56 54 Total 217 413

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2018
Line of Credit Facility [Line Items]
Schedule of Short-term Debt	As of As of (In $ millions) Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates Current installments of long-term debt 62 63 Short-term borrowings, including amounts due to affiliates (1) 89 86 Revolving credit facility (2) 197 97 Accounts receivable securitization facility (3) 77 80 Total 425 326 ______________________________ (1) The weighted average interest rate was 2.8% and 2.8% as of March 31, 2018 and December 31, 2017 , respectively. (2) The weighted average interest rate was 3.3% and 4.1% as of March 31, 2018 and December 31, 2017 , respectively. (3) The weighted average interest rate was 2.4% and 2.1% as of March 31, 2018 and December 31, 2017 , respectively.
Schedule of Long-term Debt	As of As of (In $ millions) Long-Term Debt Senior unsecured term loan due 2021 (1) 488 494 Senior unsecured notes due 2019, interest rate of 3.250% 370 360 Senior unsecured notes due 2021, interest rate of 5.875% 400 400 Senior unsecured notes due 2022, interest rate of 4.625% 500 500 Senior unsecured notes due 2023, interest rate of 1.125% 922 897 Senior unsecured notes due 2025, interest rate of 1.250% 369 359 Pollution control and industrial revenue bonds due at various dates through 2030, interest rates ranging from 4.05% to 5.00% 169 169 Nilit bank loans due at various dates through 2026 ( Note 3 ) (2) 12 11 Obligations under capital leases due at various dates through 2054 194 208 Subtotal 3,424 3,398 Unamortized debt issuance costs (3) (19 ) (20 ) Current installments of long-term debt (62 ) (63 ) Total 3,343 3,315 ______________________________ (1) The margin for borrowings under the senior unsecured term loan due 2021 was 1.5% above LIBOR at current Company credit ratings. (2) The weighted average interest rate was 1.3% and 1.3% as of March 31, 2018 and December 31, 2017 , respectively. (3) Related to the Company's long-term debt, excluding obligations under capital leases.
Accounts Receivable Securitization Facility [Member]
Line of Credit Facility [Line Items]
Schedule of Balances Available for Borrowing	The Company's debt balances and amounts available for borrowing under its securitization facility are as follows: As of (In $ millions) Accounts Receivable Securitization Facility Borrowings outstanding (1) 77 Letters of credit issued 29 Available for borrowing 3 Total borrowing base 109 Maximum borrowing base (2) 120 ______________________________ (1) The Company borrowed $25 million and repaid $28 million during the three months ended March 31, 2018 . (2) Outstanding accounts receivable transferred to the SPE was $166 million .
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Schedule of Balances Available for Borrowing	The Company's debt balances and amounts available for borrowing under its senior unsecured revolving credit facility are as follows: As of (In $ millions) Revolving Credit Facility Borrowings outstanding (1) 197 Letters of credit issued — Available for borrowing (2) 803 ______________________________ (1) The Company borrowed $435 million and repaid $335 million under its senior unsecured revolving credit facility during the three months ended March 31, 2018 . (2) The margin for borrowings under the senior unsecured revolving credit facility was 1.5% above LIBOR at current Company credit ratings.

Benefit Obligations (Tables)

Benefit Obligations (Tables)	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Schedule of Net Periodic Benefit Costs Recognized	The components of net periodic benefit cost are as follows: Three Months Ended March 31, 2018 2017 Pension Post-retirement Pension Post-retirement (In $ millions) Service cost 2 — 2 — Interest cost 26 — 27 — Expected return on plan assets (52 ) — (49 ) — Total (24 ) — (20 ) —
Schedule of Company Commitments to Fund Benefit Obligations	Benefit obligation funding is as follows: As of Total Expected 2018 (In $ millions) Cash contributions to defined benefit pension plans 6 23 Benefit payments to nonqualified pension plans 5 21 Benefit payments to other postretirement benefit plans 1 5 Cash contributions to German multiemployer defined benefit pension plans (1) 2 8

Environmental (Tables)

Environmental (Tables)	3 Months Ended
	Mar. 31, 2018
Environmental Remediation Obligations [Abstract]
Schedule of Environmental Remediation Reserves	The components of environmental remediation reserves are as follows: As of As of (In $ millions) Demerger obligations ( Note 18 ) 28 28 Divestiture obligations ( Note 18 ) 18 17 Active sites 15 15 US Superfund sites 12 11 Other environmental remediation reserves 2 2 Total 75 73

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2018
Stockholders' Equity Note [Abstract]
Schedule of Dividend Increases	The Company's Board of Directors approved increases in the Company's Common Stock cash dividend rates as follows: Increase Quarterly Common Stock Cash Dividend Annual Common Stock Cash Dividend Effective Date (In percentages) (In $ per share) April 2017 28 0.46 1.84 May 2017
Schedule of Treasury Stock	Three Months Ended Total From 2018 2017 Shares repurchased — 1,461,966 39,779,019 Average purchase price per share $ — $ 89.95 $ 58.71 Shares repurchased (in $ millions) $ — $ 131 $ 2,335 Aggregate Board of Directors repurchase authorizations during the period (in $ millions) (1) $ — $ — $ 3,866 ______________________________ (1) These authorizations give management discretion in determining the timing and conditions under which shares may be repurchased. This repurchase program began in February 2008 and does not have an expiration date.
Schedule of Components of Other Comprehensive Income (Loss), Net	Three Months Ended March 31, 2018 2017 Gross Amount Income Tax (Provision) Benefit Net Amount Gross Amount Income Tax (Provision) Benefit Net (In $ millions) Foreign currency translation 45 4 49 28 — 28 Gain (loss) on cash flow hedges (2 ) 1 (1 ) (2 ) — (2 ) Pension and postretirement benefits 1 — 1 5 — 5 Total 44 5 49 31 — 31
Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net	Adjustments to Accumulated other comprehensive income (loss), net, are as follows: Foreign Currency Translation Gain (Loss) on Cash Flow Hedges ( Note 16 ) Pension and Postretirement Benefits ( Note 11 ) Accumulated Other Comprehensive Income (Loss), Net (In $ millions) As of December 31, 2017 (176 ) 2 (3 ) (177 ) Other comprehensive income (loss) before reclassifications 45 (2 ) 1 44 Amounts reclassified from accumulated other comprehensive income (loss) — — — — Income tax (provision) benefit 4 1 — 5 As of March 31, 2018 (127 ) 1 (2 ) (128 )

Other (Charges) Gains, Net (Tab

Other (Charges) Gains, Net (Tables)	3 Months Ended
	Mar. 31, 2018
Restructuring and Related Activities [Abstract]
Schedule of Other (Charges) Gains, Net	Three Months Ended March 31, 2018 2017 (In $ millions) Restructuring — (2 ) Plant/office closures — (53 ) Total — (55 )
Schedule of Restructuring Reserves	The changes in the restructuring reserves by business segment are as follows: Engineered Materials Acetate Tow Industrial Specialties Acetyl Intermediates Other Total (In $ millions) Employee Termination Benefits As of December 31, 2017 1 — — 1 1 3 Additions — — — — — — Cash payments (1 ) — — — — (1 ) Other changes — — — — — — Exchange rate changes — — — — — — As of March 31, 2018 — — — 1 1 2 Other Plant/Office Closures As of December 31, 2017 — — — 2 — 2 Additions — — — — — — Cash payments — — — — — — Other changes — — — — — — Exchange rate changes — — — — — — As of March 31, 2018 — — — 2 — 2 Total — — — 3 1 4

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Effective Tax Rate	Three Months Ended 2018 2017 (In percentages) Effective income tax rate 15 23

Derivative Financial Instrume46

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative [Line Items]
Schedule of Changes in Fair Value of Derivatives	Information regarding changes in the fair value of the Company's derivative and non-derivative instruments is as follows: Gain (Loss) Recognized in Other Comprehensive Income (Loss) Gain (Loss) Recognized in Earnings (Loss) Three Months Ended March 31, Statement of Operations Classification 2018 2017 2018 2017 (In $ millions) Designated as Cash Flow Hedges Commodity swaps (2 ) (1 ) — 1 Cost of sales Total (2 ) (1 ) — 1 Designated as Net Investment Hedges Foreign currency denominated debt ( Note 10 ) (35 ) (13 ) — — N/A Total (35 ) (13 ) — — Not Designated as Hedges Foreign currency forwards and swaps — — (4 ) 1 Foreign exchange gain (loss), net; Other income (expense), net Total — — (4 ) 1
Offsetting Assets	Information regarding the gross amounts of the Company's derivative instruments and the amounts offset in the unaudited consolidated balance sheets is as follows: As of As of (In $ millions) Derivative Assets Gross amount recognized 8 13 Gross amount offset in the consolidated balance sheets 5 4 Net amount presented in the consolidated balance sheets 3 9 Gross amount not offset in the consolidated balance sheets 1 3 Net amount 2 6
Offsetting Liabilities	As of As of (In $ millions) Derivative Liabilities Gross amount recognized 8 7 Gross amount offset in the consolidated balance sheets 5 4 Net amount presented in the consolidated balance sheets 3 3 Gross amount not offset in the consolidated balance sheets 1 3 Net amount 2 —
Net Investment Hedging [Member]
Derivative [Line Items]
Schedule of Notional Amounts of Derivative and Nonderivative Instruments	The total notional amount of foreign currency denominated debt designated as a net investment hedge of net investments in foreign operations are as follows: As of As of (In € millions) Total 1,050 1,050
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Schedule of Notional Amounts of Derivative and Nonderivative Instruments	Gross notional values of the foreign currency forwards and swaps not designated as hedges are as follows: As of As of (In $ millions) Total 935 740

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis	Fair Value Measurement Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Total Balance Sheet Classification (In $ millions) As of March 31, 2018 Derivatives Designated as Cash Flow Hedges Commodity swaps — 1 1 Current Other assets Derivatives Not Designated as Hedges Foreign currency forwards and swaps — 2 2 Current Other assets Total assets — 3 3 Derivatives Not Designated as Hedges Foreign currency forwards and swaps — (3 ) (3 ) Current Other liabilities Total liabilities — (3 ) (3 ) As of December 31, 2017 Derivatives Designated as Cash Flow Hedges Commodity swaps — 2 2 Current Other assets Commodity swaps — 2 2 Noncurrent Other assets Derivatives Not Designated as Hedges Foreign currency forwards and swaps — 5 5 Current Other assets Total assets — 9 9 Derivatives Not Designated as Hedges Foreign currency forwards and swaps — (3 ) (3 ) Current Other liabilities Total liabilities — (3 ) (3 )
Schedule of Carrying Values and Fair Values of Financial Instruments	Carrying values and fair values of financial instruments that are not carried at fair value are as follows: Fair Value Measurement Carrying Amount Significant Other Observable Inputs (Level 2) Unobservable Inputs (Level 3) Total (In $ millions) As of March 31, 2018 Cost investments 165 — — — Insurance contracts in nonqualified trusts 42 42 — 42 Long-term debt, including current installments of long-term debt 3,424 3,310 194 3,504 As of December 31, 2017 Cost investments 159 — — — Insurance contracts in nonqualified trusts 42 42 — 42 Long-term debt, including current installments of long-term debt 3,398 3,299 208 3,507

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Schedule of Business Segments	Engineered Materials Acetate Tow Industrial Specialties Acetyl Intermediates Other Activities Eliminations Consolidated (In $ millions) Three Months Ended March 31, 2018 Net sales 665 168 274 (1) 871 (2) — (127 ) 1,851 Other (charges) gains, net ( Note 14 ) — — — — — — — Operating profit (loss) 127 46 23 231 (83 ) (1 ) 343 Equity in net earnings (loss) of affiliates 54 — — 1 3 — 58 Depreciation and amortization 32 10 9 26 2 — 79 Capital expenditures 21 — 4 30 2 — 57 (3) As of March 31, 2018 Goodwill and intangible assets, net 1,035 155 46 207 — — 1,443 Total assets 4,111 1,063 834 2,680 1,092 — 9,780 Three Months Ended March 31, 2017 - As Adjusted ( Note 2 ) Net sales 514 191 245 (1) 619 (2) — (98 ) 1,471 Other (charges) gains, net ( Note 14 ) — (1 ) — (53 ) (1 ) — (55 ) Operating profit (loss) 104 62 25 27 (48 ) — 170 Equity in net earnings (loss) of affiliates 43 — — 1 3 — 47 Depreciation and amortization 25 10 8 26 2 — 71 Capital expenditures 10 6 4 20 1 — 41 (3) As of December 31, 2017 Goodwill and intangible assets, net 902 154 46 202 — — 1,304 Total assets 3,866 1,163 861 2,657 991 — 9,538 ______________________________ (1) Includes intersegment sales of $2 million and $1 million for the three months ended March 31, 2018 and 2017 , respectively. (2) Includes intersegment sales of $125 million and $97 million for the three months ended March 31, 2018 and 2017 , respectively. (3) Includes a decrease in accrued capital expenditures of $29 million and $21 million for the three months ended March 31, 2018 and 2017 , respectively.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Schedule of Revenue by Major Customers by Reporting Segments	Further disaggregation of Net sales by business segment and geographic destination is as follows: Three Months Ended 2018 (In $ millions) Engineered Materials North America 179 Europe and Africa 337 Asia-Pacific 132 South America 17 Total 665 Acetate Tow North America 35 Europe and Africa 70 Asia-Pacific 51 South America 12 Total 168 Industrial Specialties North America 88 Europe and Africa 136 Asia-Pacific 44 South America 4 Total (1) 272 Acetyl Intermediates North America 202 Europe and Africa 181 Asia-Pacific 334 South America 29 Total (2) 746 ______________________________ (1) Excludes intersegment sales of $2 million for the three months ended March 31, 2018 . (2) Excludes intersegment sales of $125 million for the three months ended March 31, 2018

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings (Loss) Per Share	Three Months Ended 2018 2017 (In $ millions, except share data) Amounts attributable to Celanese Corporation Earnings (loss) from continuing operations 365 183 Earnings (loss) from discontinued operations (2 ) — Net earnings (loss) 363 183 Weighted average shares - basic 135,916,446 140,643,860 Incremental shares attributable to equity awards 467,289 353,543 Weighted average shares - diluted 136,383,735 140,997,403

Consolidating Guarantor Finan51

Consolidating Guarantor Financial Information (Tables)	3 Months Ended
	Mar. 31, 2018
Consolidating Guarantor Financial Information [Abstract]
Schedule of Consolidating Statement of Operations	CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED INTERIM CONSOLIDATING STATEMENT OF OPERATIONS Three Months Ended March 31, 2018 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net sales — — 600 1,554 (303 ) 1,851 Cost of sales — — (464 ) (1,178 ) 306 (1,336 ) Gross profit — — 136 376 3 515 Selling, general and administrative expenses — — (60 ) (87 ) — (147 ) Amortization of intangible assets — — (2 ) (4 ) — (6 ) Research and development expenses — — (8 ) (10 ) — (18 ) Other (charges) gains, net — — — — — — Foreign exchange gain (loss), net — — — (1 ) — (1 ) Gain (loss) on disposition of businesses and assets, net — — (2 ) 2 — — Operating profit (loss) — — 64 276 3 343 Equity in net earnings (loss) of affiliates 363 360 267 53 (985 ) 58 Non-operating pension and other postretirement employee benefit (expense) income — — 23 3 — 26 Interest expense — (5 ) (29 ) (9 ) 10 (33 ) Interest income — 8 2 2 (10 ) 2 Dividend income - cost investments — — — 32 — 32 Other income (expense), net — 1 1 2 — 4 Earnings (loss) from continuing operations before tax 363 364 328 359 (982 ) 432 Income tax (provision) benefit — (1 ) (37 ) (27 ) — (65 ) Earnings (loss) from continuing operations 363 363 291 332 (982 ) 367 Earnings (loss) from operation of discontinued operations — — — (2 ) — (2 ) Income tax (provision) benefit from discontinued operations — — — — — — Earnings (loss) from discontinued operations — — — (2 ) — (2 ) Net earnings (loss) 363 363 291 330 (982 ) 365 Net (earnings) loss attributable to noncontrolling interests — — — (2 ) — (2 ) Net earnings (loss) attributable to Celanese Corporation 363 363 291 328 (982 ) 363 CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED INTERIM CONSOLIDATING STATEMENT OF OPERATIONS Three Months Ended March 31, 2017 - As Adjusted ( Note 2 ) Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net sales — — 589 1,177 (295 ) 1,471 Cost of sales — — (445 ) (966 ) 290 (1,121 ) Gross profit — — 144 211 (5 ) 350 Selling, general and administrative expenses — — (34 ) (69 ) — (103 ) Amortization of intangible assets — — (1 ) (3 ) — (4 ) Research and development expenses — — (7 ) (10 ) — (17 ) Other (charges) gains, net — — (6 ) (49 ) — (55 ) Foreign exchange gain (loss), net — — — — — — Gain (loss) on disposition of businesses and assets, net — — (2 ) 1 — (1 ) Operating profit (loss) — — 94 81 (5 ) 170 Equity in net earnings (loss) of affiliates 183 174 101 43 (454 ) 47 Non-operating pension and other postretirement employee benefit (expense) income — — 20 2 — 22 Interest expense — (6 ) (23 ) (7 ) 7 (29 ) Interest income — 6 1 — (7 ) — Dividend income - cost investments — — — 29 — 29 Other income (expense), net — — — 1 — 1 Earnings (loss) from continuing operations before tax 183 174 193 149 (459 ) 240 Income tax (provision) benefit — 9 (63 ) 1 (3 ) (56 ) Earnings (loss) from continuing operations 183 183 130 150 (462 ) 184 Earnings (loss) from operation of discontinued operations — — — — — — Income tax (provision) benefit from discontinued operations — — — — — — Earnings (loss) from discontinued operations — — — — — — Net earnings (loss) 183 183 130 150 (462 ) 184 Net (earnings) loss attributable to noncontrolling interests — — — (1 ) — (1 ) Net earnings (loss) attributable to Celanese Corporation 183 183 130 149 (462 ) 183
Schedule of Consolidating Statements of Comprehensive Income (Loss)	CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED INTERIM CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2018 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net earnings (loss) 363 363 291 330 (982 ) 365 Other comprehensive income (loss), net of tax Foreign currency translation 49 49 63 74 (186 ) 49 Gain (loss) on cash flow hedges (1 ) (1 ) (1 ) (1 ) 3 (1 ) Pension and postretirement benefits 1 1 1 1 (3 ) 1 Total other comprehensive income (loss), net of tax 49 49 63 74 (186 ) 49 Total comprehensive income (loss), net of tax 412 412 354 404 (1,168 ) 414 Comprehensive (income) loss attributable to noncontrolling interests — — — (2 ) — (2 ) Comprehensive income (loss) attributable to Celanese Corporation 412 412 354 402 (1,168 ) 412 Three Months Ended March 31, 2017 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net earnings (loss) 183 183 130 150 (462 ) 184 Other comprehensive income (loss), net of tax Foreign currency translation 28 28 30 39 (97 ) 28 Gain (loss) on cash flow hedges (2 ) (2 ) (2 ) (2 ) 6 (2 ) Pension and postretirement benefits 5 5 4 6 (15 ) 5 Total other comprehensive income (loss), net of tax 31 31 32 43 (106 ) 31 Total comprehensive income (loss), net of tax 214 214 162 193 (568 ) 215 Comprehensive (income) loss attributable to noncontrolling interests — — — (1 ) — (1 ) Comprehensive income (loss) attributable to Celanese Corporation 214 214 162 192 (568 ) 214
Schedule of Consolidating Balance Sheet	CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED CONSOLIDATING BALANCE SHEET As of March 31, 2018 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) ASSETS Current Assets Cash and cash equivalents — 2 111 377 — 490 Trade receivables - third party and affiliates — — 160 1,209 (164 ) 1,205 Non-trade receivables, net 38 486 301 441 (995 ) 271 Inventories, net — — 281 719 (45 ) 955 Marketable securities, at fair value — — 32 — — 32 Other assets — 14 8 55 (24 ) 53 Total current assets 38 502 893 2,801 (1,228 ) 3,006 Investments in affiliates 3,215 4,461 4,140 861 (11,698 ) 979 Property, plant and equipment, net — — 1,181 2,620 — 3,801 Deferred income taxes — 14 12 159 (3 ) 182 Other assets — 1,519 214 153 (1,517 ) 369 Goodwill — — 399 708 — 1,107 Intangible assets, net — — 82 254 — 336 Total assets 3,253 6,496 6,921 7,556 (14,446 ) 9,780 LIABILITIES AND EQUITY Current Liabilities Short-term borrowings and current installments of long-term debt - third party and affiliates — 83 151 466 (275 ) 425 Trade payables - third party and affiliates — — 288 673 (164 ) 797 Other liabilities — 38 264 217 (253 ) 266 Income taxes payable — — 501 103 (490 ) 114 Total current liabilities — 121 1,204 1,459 (1,182 ) 1,602 Noncurrent Liabilities Long-term debt — 3,160 1,476 231 (1,524 ) 3,343 Deferred income taxes — — — 223 (4 ) 219 Uncertain tax positions — — 9 145 (2 ) 152 Benefit obligations — — 273 309 — 582 Other liabilities — — 55 162 — 217 Total noncurrent liabilities — 3,160 1,813 1,070 (1,530 ) 4,513 Total Celanese Corporation stockholders' equity 3,253 3,215 3,904 4,615 (11,734 ) 3,253 Noncontrolling interests — — — 412 — 412 Total equity 3,253 3,215 3,904 5,027 (11,734 ) 3,665 Total liabilities and equity 3,253 6,496 6,921 7,556 (14,446 ) 9,780 CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED CONSOLIDATING BALANCE SHEET As of December 31, 2017 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) ASSETS Current Assets Cash and cash equivalents — — 230 346 — 576 Trade receivables - third party and affiliates — — 89 988 (91 ) 986 Non-trade receivables, net 38 482 279 385 (940 ) 244 Inventories, net — — 277 672 (49 ) 900 Marketable securities, at fair value — — 32 — — 32 Other assets — 60 12 93 (111 ) 54 Total current assets 38 542 919 2,484 (1,191 ) 2,792 Investments in affiliates 2,850 4,283 3,916 861 (10,934 ) 976 Property, plant and equipment, net — — 1,145 2,617 — 3,762 Deferred income taxes — 6 206 158 (4 ) 366 Other assets — 1,295 171 165 (1,293 ) 338 Goodwill — — 314 689 — 1,003 Intangible assets, net — — 48 253 — 301 Total assets 2,888 6,126 6,719 7,227 (13,422 ) 9,538 LIABILITIES AND EQUITY Current Liabilities Short-term borrowings and current installments of long-term debt - third party and affiliates — 76 148 369 (267 ) 326 Trade payables - third party and affiliates — 1 300 598 (92 ) 807 Other liabilities — 71 302 273 (292 ) 354 Income taxes payable — — 471 92 (491 ) 72 Total current liabilities — 148 1,221 1,332 (1,142 ) 1,559 Noncurrent Liabilities Long-term debt — 3,128 1,254 233 (1,300 ) 3,315 Deferred income taxes — — — 215 (4 ) 211 Uncertain tax positions — — 1 157 (2 ) 156 Benefit obligations — — 277 308 — 585 Other liabilities — — 255 158 — 413 Total noncurrent liabilities — 3,128 1,787 1,071 (1,306 ) 4,680 Total Celanese Corporation stockholders' equity 2,888 2,850 3,711 4,412 (10,974 ) 2,887 Noncontrolling interests — — — 412 — 412 Total equity 2,888 2,850 3,711 4,824 (10,974 ) 3,299 Total liabilities and equity 2,888 6,126 6,719 7,227 (13,422 ) 9,538
Schedule of Consolidating Statement of Cash Flows	CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED INTERIM CONSOLIDATING STATEMENT OF CASH FLOWS Three Months Ended March 31, 2018 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net cash provided by (used in) operating activities 63 277 (33 ) 170 (334 ) 143 Investing Activities Capital expenditures on property, plant and equipment — — (54 ) (32 ) — (86 ) Acquisitions, net of cash acquired — — (144 ) — — (144 ) Proceeds from sale of businesses and assets, net — — — 9 — 9 Return of capital from subsidiary — — 211 — (211 ) — Contributions to subsidiary — — (16 ) — 16 — Intercompany loan receipts (disbursements) — (222 ) (15 ) — 237 — Other, net — — (3 ) (11 ) — (14 ) Net cash provided by (used in) investing activities — (222 ) (21 ) (34 ) 42 (235 ) Financing Activities Net change in short-term borrowings with maturities of 3 months or less — 15 2 99 (15 ) 101 Proceeds from short-term borrowings — — — 36 — 36 Repayments of short-term borrowings — — — (38 ) — (38 ) Proceeds from long-term debt — — 222 — (222 ) — Repayments of long-term debt — (6 ) (12 ) (13 ) — (31 ) Purchases of treasury stock, including related fees — — — — — — Dividends to parent — (62 ) (272 ) — 334 — Contributions from parent — — — 16 (16 ) — Series A common stock dividends (63 ) — — — — (63 ) Return of capital to parent — — — (211 ) 211 — (Distributions to) contributions from noncontrolling interests — — — (2 ) — (2 ) Other, net — — (5 ) — — (5 ) Net cash provided by (used in) financing activities (63 ) (53 ) (65 ) (113 ) 292 (2 ) Exchange rate effects on cash and cash equivalents — — — 8 — 8 Net increase (decrease) in cash and cash equivalents — 2 (119 ) 31 — (86 ) Cash and cash equivalents as of beginning of period — — 230 346 — 576 Cash and cash equivalents as of end of period — 2 111 377 — 490 CELANESE CORPORATION AND SUBSIDIARIES UNAUDITED INTERIM CONSOLIDATING STATEMENT OF CASH FLOWS Three Months Ended March 31, 2017 Parent Guarantor Issuer Subsidiary Guarantors Non- Guarantors Eliminations Consolidated (In $ millions) Net cash provided by (used in) operating activities 179 196 210 130 (523 ) 192 Investing Activities Capital expenditures on property, plant and equipment — — (42 ) (20 ) — (62 ) Acquisitions, net of cash acquired — (11 ) — — 11 — Proceeds from sale of businesses and assets, net — — — 12 (11 ) 1 Return of capital from subsidiary — — 5 — (5 ) — Contributions to subsidiary — — — — — — Intercompany loan receipts (disbursements) — — 7 — (7 ) — Other, net — — — (3 ) — (3 ) Net cash provided by (used in) investing activities — (11 ) (30 ) (11 ) (12 ) (64 ) Financing Activities Net change in short-term borrowings with maturities of 3 months or less — (7 ) 6 — 7 6 Proceeds from short-term borrowings — — — 7 — 7 Repayments of short-term borrowings — — — (29 ) — (29 ) Proceeds from long-term debt — — — — — — Repayments of long-term debt — — — (53 ) — (53 ) Purchases of treasury stock, including related fees (128 ) — — — — (128 ) Dividends to parent — (178 ) (165 ) (180 ) 523 — Contributions from parent — — — — — — Series A common stock dividends (51 ) — — — — (51 ) Return of capital to parent — — — (5 ) 5 — (Distributions to) contributions from noncontrolling interests — — — (4 ) — (4 ) Other, net — — (16 ) (2 ) — (18 ) Net cash provided by (used in) financing activities (179 ) (185 ) (175 ) (266 ) 535 (270 ) Exchange rate effects on cash and cash equivalents — — — 5 — 5 Net increase (decrease) in cash and cash equivalents — — 5 (142 ) — (137 ) Cash and cash equivalents as of beginning of period — — 51 587 — 638 Cash and cash equivalents as of end of period — — 56 445 — 501

Recent Accounting Pronounceme52

Recent Accounting Pronouncements Revenue recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Goods and Services Sold	$ 1,336	$ 1,121
Selling, General and Administrative Expense	147	103
Operating Income (Loss)	343	170
Non-operating pension and other postretirement employee benefit (expense) income	$ (26)	(22)
Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Goods and Services Sold		1,119
Selling, General and Administrative Expense		83
Operating Income (Loss)		192
Non-operating pension and other postretirement employee benefit (expense) income		0
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Goods and Services Sold		(2)
Selling, General and Administrative Expense		(20)
Operating Income (Loss)		(22)
Non-operating pension and other postretirement employee benefit (expense) income		$ (22)
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 0
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 0

Acquisitions, Dispositions an53

Acquisitions, Dispositions and Plant Closures (Details) - USD ($) $ in Millions		Mar. 31, 2018	[1]	Feb. 01, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 1,107			$ 1,003
Nylon compounding division of Nilit Group [Member]
Business Acquisition [Line Items]
Cash and cash equivalents				$ 2
Trade receivables - third party and affiliates				12
Inventories				13
Property, plant and equipment, net				19
Intangible assets (Note 7)				35
Goodwill	[2]			84
Other assets				1
Total fair value of assets acquired				166
Trade payables - third party and affiliates				(8)
Total debt				(12)
Total fair value of liabilities assumed				(20)
Net assets acquired				$ 146
Business Combination, Net Earnings as a Percent of Acquirer's Net earnings				1.00%
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
Engineered Materials [Member]
Business Acquisition [Line Items]
Goodwill		$ 741			$ 643
[1]	There were $0 million of accumulated impairment losses as of March 31, 2018.
[2]	Goodwill consists of expected revenue and operating synergies resulting from the acquisition, all of which is deductible for income tax purposes.

Acquisitions, Dispositions an54

Acquisitions, Dispositions and Plant Closures (Narrative) (Details) - USD ($) $ in Millions	11 Months Ended
	Mar. 31, 2018	Feb. 01, 2018
Omni Plastics [Member]
Business Acquisition [Line Items]
Business Combination, Net Earnings as a Percent of Acquirer's Net earnings		1.00%
Advanced Engineered Materials [Member] | Nylon compounding division of Nilit Group [Member]
Business Acquisition [Line Items]
Goodwill, Purchase Accounting Adjustments	$ 2

Ventures and Variable Interes55

Ventures and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Cash and cash equivalents		$ 490	$ 576	$ 501	$ 638
Trade receivables - third party and affiliates		1,205	986
Nontrade Receivables, Current		271	244
Property, plant and equipment (net of accumulated depreciation - 2018: $100; 2017: $90)		3,801	3,762
Accumulated depreciation		2,686	2,584
Intangible assets (net of accumulated amortization - 2018: $3; 2017: $2)		336	301
Accumulated amortization		609	591
Other assets		369	338
Total assets		9,780	9,538
Trade payables		797	807
Other liabilities		1,602	1,559
Restructuring reserves (Note 14)		4
Deferred income taxes		219	211
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents		18	19
Trade receivables - third party and affiliates		5	5
Nontrade Receivables, Current		1	0
Property, plant and equipment (net of accumulated depreciation - 2018: $100; 2017: $90)		689	697
Intangible assets (net of accumulated amortization - 2018: $3; 2017: $2)		25	25
Other assets		7	6
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Property, plant and equipment (net of accumulated depreciation - 2018: $100; 2017: $90)		49	53
Trade payables		33	25
Current installments of long-term debt		13	18
Long-term debt		74	76
Total liabilities		120	119
Maximum exposure to loss		165	164
Fairway Methanol LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents		18	19
Trade receivables - third party and affiliates		9	9
Nontrade Receivables, Current		1	0
Property, plant and equipment (net of accumulated depreciation - 2018: $100; 2017: $90)		689	697
Accumulated depreciation		100	90
Intangible assets (net of accumulated amortization - 2018: $3; 2017: $2)		25	25
Accumulated amortization		3	2
Other assets		7	6
Total assets	[1]	749	756
Trade payables		7	16
Other liabilities	[2]	5	4
Long-term debt		5	5
Deferred income taxes		3	3
Total liabilities		20	28
Acetyl Intermediates [Member]
Variable Interest Entity [Line Items]
Restructuring reserves (Note 14)		3
Plant/Office Closures [Member]
Variable Interest Entity [Line Items]
Restructuring reserves (Note 14)		2	2
Plant/Office Closures [Member] | Acetyl Intermediates [Member]
Variable Interest Entity [Line Items]
Restructuring reserves (Note 14)		$ 2	$ 2
[1]	Assets can only be used to settle the obligations of Fairway.
[2]	Primarily represents amounts owed by Fairway to the Company for reimbursement of expenditures.

Ventures and Variable Interes56

Ventures and Variable Interest Entities (Narrative) (Details)	3 Months Ended
	Mar. 31, 2018
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Ownership percentage	50.00%

Marketable Securities, at Fai57

Marketable Securities, at Fair Value (Schedule of Available-for-sale Securities) (Details) - Investments [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 32	$ 32
Gross unrealized gain	0	0
Gross unrealized loss	0	0
Fair value	$ 32	$ 32

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Finished goods	$ 610	$ 591
Work-in-process	58	57
Raw materials and supplies	287	252
Total	$ 955	$ 900

Goodwill and Intangible Asset59

Goodwill and Intangible Assets, net (Schedule of Goodwill) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Goodwill [Line Items]
As of December 31, 2017	$ 1,003
Acquisitions (Note 3)	84
Exchange rate changes	20
As of June 30, 2017	1,107	[1]
Goodwill, Impaired, Accumulated Impairment Loss	0
Engineered Materials [Member]
Goodwill [Line Items]
As of December 31, 2017	643
Acquisitions (Note 3)	84
Exchange rate changes	14
As of June 30, 2017	741	[1]
Consumer Specialties [Member]
Goodwill [Line Items]
As of December 31, 2017	149
Acquisitions (Note 3)	0
Exchange rate changes	1
As of June 30, 2017	150	[1]
Industrial Specialties [Member]
Goodwill [Line Items]
As of December 31, 2017	40
Acquisitions (Note 3)	0
Exchange rate changes	0
As of June 30, 2017	40	[1]
Acetyl Intermediates [Member]
Goodwill [Line Items]
As of December 31, 2017	171
Acquisitions (Note 3)	0
Exchange rate changes	5
As of June 30, 2017	$ 176	[1]
[1]	There were $0 million of accumulated impairment losses as of March 31, 2018.

Goodwill and Intangible Asset60

Goodwill and Intangible Assets, net (Schedule of Finite-lived intangible assets) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2017		$ 777
Acquisitions (Note 3)	[1]	35
Exchange rate changes		16
As of March 31, 2018		828
As of December 31, 2017		(591)
Amortization		(6)	$ (4)
Exchange rate changes		(12)
As of March 31, 2018		(609)
Net book value		219
Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2017		38
Acquisitions (Note 3)		0
Exchange rate changes		1
As of March 31, 2018		39
As of December 31, 2017		(33)
Amortization		0
Exchange rate changes		(1)
As of March 31, 2018		(34)
Net book value		5
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2017		640
Acquisitions (Note 3)		32
Exchange rate changes		14
As of March 31, 2018		686
As of December 31, 2017		(496)
Amortization		(4)
Exchange rate changes		(10)
As of March 31, 2018		(510)
Net book value		176
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2017		45
Acquisitions (Note 3)		0
Exchange rate changes		1
As of March 31, 2018		46
As of December 31, 2017		(30)
Amortization		(1)
Exchange rate changes		(1)
As of March 31, 2018		(32)
Net book value		14
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2017		54
Acquisitions (Note 3)		3
Exchange rate changes		0
As of March 31, 2018		57
As of December 31, 2017		(32)
Amortization		(1)
Exchange rate changes		0
As of March 31, 2018		(33)
Net book value		$ 24
Nylon compounding division of Nilit Group [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		11 years
[1]	Represents intangible assets acquired related to Omni Plastics (Note 3) with a weighted average amortization period of 11 years.

Goodwill and Intangible Asset61

Goodwill and Intangible Assets, net (Schedule of Indefinite-lived intangible assets) (Details) - Trademarks and Trade Names [Member] $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Indefinite-lived Intangible Assets [Line Items]
As of December 31, 2017	$ 115
Acquisitions (Note 3)	0
Accumulated impairment losses	0
Exchange rate changes	2
As of March 31, 2018	$ 117

Goodwill and Intangible Asset62

Goodwill and Intangible Assets, net (Schedule of Future amortization expense) (Details) $ in Millions	Mar. 31, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,019	$ 21
2,020	19
2,021	18
2,022	17
2,023	$ 15

Current Other Liabilities (Deta

Current Other Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Other Liabilities, Current [Abstract]
Asset retirement obligations	$ 11	$ 19
Benefit obligations (Note 11)	30	30
Customer rebates	46	65
Derivatives (Note 16)	3	3
Environmental (Note 12)	18	14
Insurance	4	5
Interest	25	17
Restructuring (Note 14)	4	5
Salaries and benefits	65	113
Sales and use tax/foreign withholding tax payable	19	16
Other	41	67
Total	$ 266	$ 354

Noncurrent Other Liabilities (D

Noncurrent Other Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]
Asset retirement obligations	$ 7	$ 7
Deferred proceeds	48	47
Deferred revenue	6	6
Environmental (Note 12)	57	59
Income taxes payable	0	197
Insurance	43	43
Other	56	54
Total	$ 217	$ 413

Debt (Schedule of Short-term De

Debt (Schedule of Short-term Debt) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Current installments of long-term debt		$ 62	$ 63
Short-term borrowings, including amounts due to affiliates	[1]	89	86
Total		$ 425	$ 326
Weighted average interest rate, short-term borrowings		2.80%	2.80%
Revolving Credit Facility [Member]
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Weighted average interest rate, short-term borrowings		3.30%	4.10%
Accounts Receivable Securitization Facility [Member]
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Borrowings outstanding	[2]	$ 77	$ 80
Weighted average interest rate, short-term borrowings		2.40%	2.10%
Secured Debt [Member] | Accounts Receivable Securitization Facility [Member]
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Borrowings outstanding	[3]	$ 77
Revolving Credit Facility [Member]
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Borrowings outstanding	[2]	197	$ 97
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member]
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Borrowings outstanding	[4]	$ 197
[1]	The weighted average interest rate was 2.8% and 2.8% as of March 31, 2018 and December 31, 2017, respectively.
[2]	The weighted average interest rate was 2.4% and 2.1% as of March 31, 2018 and December 31, 2017, respectively.
[3]	The Company borrowed $25 million and repaid $28 million during the three months ended March 31, 2018.
[4]	The Company borrowed $435 million and repaid $335 million under its senior unsecured revolving credit facility during the three months ended March 31, 2018.

Debt (Schedule of Long-term Deb

Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017	Jul. 15, 2016
Long-Term Debt
Subtotal		$ 3,424	$ 3,398
Unamortized debt issuance costs	[1]	(19)	(20)
Current installments of long-term debt		(62)	(63)
Total		3,343	3,315
Senior Unsecured Term Loan Due 2021 [Member]
Long-Term Debt
Senior unsecured debt	[2]	$ 488	494	$ 500
Date of maturity		Jul. 15, 2021
Senior Unsecured Notes Due 2019 [Member]
Long-Term Debt
Senior unsecured debt		$ 370	360
Interest rate		3.25%
Date of maturity		Oct. 15, 2019
Senior Unsecured Notes Due 2021 [Member]
Long-Term Debt
Senior unsecured debt		$ 400	400
Interest rate		5.875%
Date of maturity		Jun. 15, 2021
Senior Unsecured Notes Due 2022 [Member]
Long-Term Debt
Senior unsecured debt		$ 500	500
Interest rate		4.625%
Date of maturity		Nov. 15, 2022
Senior Unsecured Notes Due 2023 [Member]
Long-Term Debt
Senior unsecured debt		$ 922	897
Interest rate		1.125%
Date of maturity		Sep. 26, 2023
Senior Unsecured Notes Due 2025 [Member]
Long-Term Debt
Senior unsecured debt		$ 369	359
Interest rate		1.25%
Date of maturity		Dec. 11, 2025
Refunding loan for pollution control and industrial revenue bonds [Member]
Long-Term Debt
Other long-term debt		$ 169	$ 169
Date of maturity		Dec. 31, 2030
Nylon compounding division of Nilit Group [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		1.30%	1.30%
Long-Term Debt
Other long-term debt	[3]	$ 12	$ 11
Date of maturity		Dec. 31, 2026
Obligations Under Capital Leases [Member]
Long-Term Debt
Capital lease obligations		$ 194	$ 208
Date of maturity		Dec. 31, 2054
Minimum [Member] | Refunding loan for pollution control and industrial revenue bonds [Member]
Long-Term Debt
Interest rate		4.05%
Maximum [Member] | Refunding loan for pollution control and industrial revenue bonds [Member]
Long-Term Debt
Interest rate		5.00%
London Interbank Offered Rate (LIBOR) [Member] | Senior Unsecured Term Loan Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
[1]	Related to the Company's long-term debt, excluding obligations under capital leases.
[2]	The margin for borrowings under the senior unsecured term loan due 2021 was 1.5% above LIBOR at current Company credit ratings.
[3]	The weighted average interest rate was 1.3% and 1.3% as of March 31, 2018 and December 31, 2017, respectively.

Debt (Senior Credit Facilities

Debt (Senior Credit Facilities Narrative) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017	Jul. 15, 2016
Senior Unsecured Term Loan Due 2021 [Member]
Debt Instrument [Line Items]
Senior unsecured debt	[1]	$ 488	$ 494	$ 500
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing base	[2]			$ 1,000
[1]	The margin for borrowings under the senior unsecured term loan due 2021 was 1.5% above LIBOR at current Company credit ratings.
[2]	The margin for borrowings under the senior unsecured revolving credit facility was 1.5% above LIBOR at current Company credit ratings.

Debt (Schedule of Revolving Cre

Debt (Schedule of Revolving Credit Facility) (Details) - Revolving Credit Facility [Member] - USD ($) $ in Millions		Mar. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Borrowings outstanding	[1]	$ 197	$ 197	$ 97
Senior Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Proceeds from Lines of Credit			435
Repayments of Lines of Credit			335
Borrowings outstanding	[2]	197	197
Letters of credit issued		0	0
Available for borrowing	[3]	$ 803	$ 803
London Interbank Offered Rate (LIBOR) [Member] | Senior Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
[1]	The weighted average interest rate was 2.4% and 2.1% as of March 31, 2018 and December 31, 2017, respectively.
[2]	The Company borrowed $435 million and repaid $335 million under its senior unsecured revolving credit facility during the three months ended March 31, 2018.
[3]	The margin for borrowings under the senior unsecured revolving credit facility was 1.5% above LIBOR at current Company credit ratings.

Debt (Schedule of Accounts Rece

Debt (Schedule of Accounts Receivable Securitization Facility)(Details) - Accounts Receivable Securitization Facility [Member] - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Borrowings outstanding	[1]	$ 77	$ 80
Secured Debt [Member]
Debt Instrument [Line Items]
Borrowings outstanding	[2]	77
Letters of credit issued		29
Available for borrowing		3
Total borrowing base		109
Maximum borrowing base	[3]	120
Proceeds from Issuance of Debt		25
Repayments of Lines of Credit		28
Outstanding accounts receivable transferred by the Originators to the Transferor		$ 166
[1]	The weighted average interest rate was 2.4% and 2.1% as of March 31, 2018 and December 31, 2017, respectively.
[2]	The Company borrowed $25 million and repaid $28 million during the three months ended March 31, 2018.
[3]	Outstanding accounts receivable transferred to the SPE was $166 million.

Benefit Obligations (Schedule o

Benefit Obligations (Schedule of Net Periodic Benefit Costs Recognized) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 2
Interest cost	26	27
Expected return on plan assets	(52)	(49)
Total	(24)	(20)
Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	0	0
Expected return on plan assets	0	0
Total	$ 0	$ 0

Benefit Obligations (Schedule71

Benefit Obligations (Schedule of Company Commitments to Fund Benefit Obligations) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Multiemployer Plans, Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Total contributions year-to-date	$ 2	[1]
Total expected contributions in current fiscal year	8	[1]
Cash Contributions to Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total contributions year-to-date	6
Total expected contributions in current fiscal year	23
Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total contributions year-to-date	5
Total expected contributions in current fiscal year	21
Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total contributions year-to-date	1
Total expected contributions in current fiscal year	$ 5
[1]	The Company makes contributions based on specified percentages of employee contributions.

Environmental (Schedule of Envi

Environmental (Schedule of Environmental Remediation Reserves) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Environmental Remediation Obligations [Abstract]
Demerger obligations (Note 18)	$ 28	$ 28
Divestiture obligations (Note 18)	18	17
Active sites	15	15
US Superfund sites	12	11
Other environmental remediation reserves	2	2
Total	$ 75	$ 73

Environmental (US Superfund Sit

Environmental (US Superfund Sites Narrative) (Details) - Passaic River, New Jersey [Member] $ in Billions	Mar. 31, 2016USD ($)	Mar. 31, 2018
Site Contingency [Line Items]
Number of parties included in USEPA order		70
Cost of EPA's plan estimate	$ 1.4
Environmental Liability Percentage		1.00%

Stockholders' Equity (Schedule

Stockholders' Equity (Schedule of Dividend Increases) (Details)	1 Months Ended
	Apr. 30, 2017$ / shares
Stockholders' Equity Note [Abstract]
Common stock, dividends, rate increase, percent	28.00%
Quarterly Common Stock Cash Dividend	$ 0.46
Annual Common Stock Cash Dividend	$ 1.84

Stockholders' Equity (Schedul75

Stockholders' Equity (Schedule of Treasury Stock) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		122 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018
Class of Stock [Line Items]
Shares repurchased		0	1,461,966	39,779,019
Average purchase price per share		$ 0	$ 89.95	$ 58.71
Shares repurchased (in $ millions)		$ 0	$ 131	$ 2,335
Aggregate Board of Directors repurchase authorizations (in $ millions)	[1]	$ 0	$ 0	$ 3,866
[1]	These authorizations give management discretion in determining the timing and conditions under which shares may be repurchased. This repurchase program began in February 2008 and does not have an expiration date.

Stockholders' Equity (Schedul76

Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss), net [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	$ 45	$ 28
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	4	0
Foreign currency translation	49	28
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Cash Flow Hedges Arising During Period, before Tax	(2)	(2)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Cash Flow Hedges Arising During Period, Tax	1	0
Gain (loss) on cash flow hedges	(1)	(2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	1	5
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	0	0
Pension and postretirement benefits	1	5
Other Comprehensive Income (Loss), before Tax	44	31
Income tax (provision) benefit	5	0
Total other comprehensive income (loss), net of tax	$ 49	$ 31

Stockholders' Equity (Schedul77

Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2017	$ (177)
Other comprehensive income (loss) before reclassifications	44
Amounts reclassified from accumulated other comprehensive income (loss)	0
Income tax (provision) benefit	5	$ 0
As of March 31, 2018	(128)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2017	(176)
Other comprehensive income (loss) before reclassifications	45
Amounts reclassified from accumulated other comprehensive income (loss)	0
Income tax (provision) benefit	4
As of March 31, 2018	(127)
Gain (Loss) from Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2017	2
Other comprehensive income (loss) before reclassifications	(2)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Income tax (provision) benefit	1
As of March 31, 2018	1
Pension and Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2017	(3)
Other comprehensive income (loss) before reclassifications	1
Amounts reclassified from accumulated other comprehensive income (loss)	0
Income tax (provision) benefit	0
As of March 31, 2018	$ (2)

Other (Charges) Gains, Net (Sch

Other (Charges) Gains, Net (Schedule of Other (Charges) Gains, Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 0	$ (2)
Other plant/office closures	0	(53)
Other (charges) gains, net	$ 0	(55)
Acetyl Intermediates [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		(53)
Contract Termination [Member] | Acetyl Intermediates [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		(27)
Non-income tax receivable adjustment [Member] | Acetyl Intermediates [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		$ (18)

Other (Charges) Gains, Net (S79

Other (Charges) Gains, Net (Schedule of Restructuring Reserves) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Restructuring Cost and Reserve [Line Items]
As of March 31, 2018	$ 4
Total	4
Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	3
Additions	0
Cash payments	(1)
Other changes	0
Exchange rate changes	0
As of March 31, 2018	2
Total	3
Plant/Office Closures [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	2
Additions	0
Cash payments	0
Other changes	0
Exchange rate changes	0
As of March 31, 2018	2
Total	2
Industrial Specialties [Member]
Restructuring Cost and Reserve [Line Items]
As of March 31, 2018	0
Total	0
Industrial Specialties [Member] | Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	0
Additions	0
Cash payments	0
Other changes	0
Exchange rate changes	0
As of March 31, 2018	0
Total	0
Industrial Specialties [Member] | Plant/Office Closures [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	0
Additions	0
Cash payments	0
Other changes	0
Exchange rate changes	0
As of March 31, 2018	0
Total	0
Acetyl Intermediates [Member]
Restructuring Cost and Reserve [Line Items]
As of March 31, 2018	3
Total	3
Acetyl Intermediates [Member] | Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	1
Additions	0
Cash payments	0
Other changes	0
Exchange rate changes	0
As of March 31, 2018	1
Total	1
Acetyl Intermediates [Member] | Plant/Office Closures [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	2
Additions	0
Cash payments	0
Other changes	0
Exchange rate changes	0
As of March 31, 2018	2
Total	2
Other Activities [Member]
Restructuring Cost and Reserve [Line Items]
As of March 31, 2018	1
Total	1
Other Activities [Member] | Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	1
Additions	0
Cash payments	0
Other changes	0
Exchange rate changes	0
As of March 31, 2018	1
Total	1
Other Activities [Member] | Plant/Office Closures [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	0
Additions	0
Cash payments	0
Other changes	0
Exchange rate changes	0
As of March 31, 2018	0
Total	0
Engineered Materials [Member]
Restructuring Cost and Reserve [Line Items]
As of March 31, 2018	0
Total	0
Engineered Materials [Member] | Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	1
Additions	0
Cash payments	(1)
Other changes	0
Exchange rate changes	0
As of March 31, 2018	0
Total	1
Engineered Materials [Member] | Plant/Office Closures [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	0
Additions	0
Cash payments	0
Other changes	0
Exchange rate changes	0
As of March 31, 2018	0
Total	0
Acetate Tow [Member] | Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	0
Additions	0
Cash payments	0
Other changes	0
Exchange rate changes	0
As of March 31, 2018	0
Total	0
Acetate Tow [Member] | Plant/Office Closures [Member]
Restructuring Cost and Reserve [Line Items]
As of December 31, 2017	0
Additions	0
Cash payments	0
Other changes	0
Exchange rate changes	0
As of March 31, 2018	0
Total	$ 0

Other (Charges) Gains, Net (Nar

Other (Charges) Gains, Net (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Other plant/office closures	$ 0	$ 53
Employee termination benefits	$ 0	2
Acetyl Intermediates [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		53
Acetyl Intermediates [Member] | Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		27
Acetyl Intermediates [Member] | Non-income tax receivable adjustment [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		$ 18

Income Taxes (Schedule of Effec

Income Taxes (Schedule of Effective Tax Rate) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	$ 24
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 5
Effective income tax rate	15.00%	23.00%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 31, 2018
Tax Credit Carryforward [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions		$ 52
Income Tax Examination, pre-tax adjustments proposed	$ 192		$ 198
Income Tax Examination, Estimate of Possible Loss	$ 136

Derivative Financial Instrume83

Derivative Financial Instruments Derivative Financial Instruments (Schedule of Net Investment Hedges) (Details) - EUR (€) € in Millions	Mar. 31, 2018	Dec. 31, 2017
Foreign Currency Denominated Debt [Member] | Net Investment Hedging [Member]
Derivative [Line Items]
Notional Amount of Nonderivative Instruments	€ 1,050	€ 1,050

Derivative Financial Instrume84

Derivative Financial Instruments Derivative Financial Instruments (Schedule of Foreign Currency Forwards) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional Value	$ 935	$ 740

Derivative Financial Instrume85

Derivative Financial Instruments (Schedule of Changes in Fair Value of Derivatives) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	$ (2)	$ (1)
Gain (Loss) Recognized in Earnings (Loss)	0	1
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	0	0
Gain (Loss) Recognized in Earnings (Loss)	(4)	1
Commodity Contract [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	(2)	(1)
Gain (Loss) Recognized in Earnings (Loss)	0	1
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	0	0
Gain (Loss) Recognized in Earnings (Loss)	(4)	1
Net Investment Hedging [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	(35)	(13)
Gain (Loss) Recognized in Earnings (Loss)	0	0
Foreign Currency Denominated Debt [Member] | Net Investment Hedging [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	(35)	(13)
Gain (Loss) Recognized in Earnings (Loss)	$ 0	$ 0

Derivative Financial Instrume86

Derivative Financial Instruments (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivative Assets [Abstract]
Gross amount recognized	$ 8	$ 13
Gross amount offset in the consolidated balance sheets	5	4
Net amount presented in the consolidated balance sheets	3	9
Gross amount not offset in the consolidated balance sheets	1	3
Net amount	$ 2	$ 6

Derivative Financial Instrume87

Derivative Financial Instruments (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivative Liabilities [Abstract]
Gross amount recognized	$ 8	$ 7
Gross amount offset in the consolidated balance sheets	5	4
Net amount presented in the consolidated balance sheets	3	3
Gross amount not offset in the consolidated balance sheets	1	3
Net amount	$ 2	$ 0

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 2	$ 6
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	3	9
Total liabilities	(3)	(3)
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	3	9
Total liabilities	(3)	(3)
Current Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1	2
Current Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0
Current Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1	2
Current Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency forwards and swaps	2	5
Current Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency forwards and swaps	0	0
Current Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency forwards and swaps	2	5
Other Noncurrent Assets [Member] | Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		2
Other Noncurrent Assets [Member] | Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0
Other Noncurrent Assets [Member] | Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		2
Current Other liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency forwards and swaps	(3)	(3)
Current Other liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency forwards and swaps	0	0
Current Other liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency forwards and swaps	$ (3)	$ (3)

Fair Value Measurements (Sche89

Fair Value Measurements (Schedule of Carrying Values and Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost investments, carrying amount	$ 165	$ 159
Cost investments, fair value	0	0
Insurance contracts in nonqualified trusts, carrying amount	42	42
Insurance contracts in nonqualified trusts, fair value	42	42
Long-term debt, including current installments of long-term debt, carrying amount	3,424	3,398
Long-term debt, including current installments of long-term debt, fair value	3,504	3,507
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost investments, fair value	0	0
Insurance contracts in nonqualified trusts, fair value	42	42
Long-term debt, including current installments of long-term debt, fair value	3,310	3,299
Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost investments, fair value	0	0
Insurance contracts in nonqualified trusts, fair value	0	0
Long-term debt, including current installments of long-term debt, fair value	$ 194	$ 208

Commitments and Contingencies (

Commitments and Contingencies (Guarantees - Demerger and Divesture Obligations Narrative) (Details) € in Millions, $ in Millions	3 Months Ended	221 Months Ended
	Mar. 31, 2018USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2018EUR (€)
Indemnification Agreements Hoechst [Member]
Loss Contingencies [Line Items]
Number of divestiture agreements	19	19	19
Indemnification amount | €			€ 250
Indemnification ceiling amount | €			€ 750
Indemnification percentage exceeding ceiling amount	33.33%	33.33%	33.33%
Loss contingency accrual, carrying value, payments | $		$ 82
Indemnification percentage, other	33.33%	33.33%	33.33%
Divestiture Agreements [Member]
Loss Contingencies [Line Items]
Term of divestiture obligations	2,037
Guarantor obligations, maximum exposure | $	$ 123	$ 123

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies (Purchase Obligations Narrative) (Details) $ in Billions	3 Months Ended
	Mar. 31, 2018USD ($)
Long-term Purchase Commitment [Line Items]
Unrecorded unconditional purchase obligations	$ 1.7
Term of unrecorded unconditional purchase obligations	Dec. 31, 2036

Segment Information (Schedule o

Segment Information (Schedule of Business Segments) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018		Mar. 31, 2017		Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales		$ 1,851		$ 1,471
Other (charges) gains, net (Note 14)		0		(55)
Operating profit (loss)		343		170
Equity in net earnings (loss) of affiliates		58		47
Depreciation and amortization		79		71
Capital expenditures	[1]	57		41
Goodwill and intangible assets, net		1,443				$ 1,304
Total assets		9,780				9,538
Increase (decrease) in accrued capital expenditures		(29)		(21)
Acetate Tow [Member]
Segment Reporting Information [Line Items]
Net sales		168
Industrial Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	[2]	272
Acetyl Intermediates [Member]
Segment Reporting Information [Line Items]
Net sales	[3]	746
Engineered Materials [Member]
Segment Reporting Information [Line Items]
Net sales		665
Operating Segments [Member] | Consumer Specialties [Member]
Segment Reporting Information [Line Items]
Net sales		168		191
Other (charges) gains, net (Note 14)		0		1
Operating profit (loss)		46		62
Equity in net earnings (loss) of affiliates		0		0
Depreciation and amortization		10		10
Capital expenditures		0		6
Goodwill and intangible assets, net		155				154
Total assets		1,063				1,163
Operating Segments [Member] | Industrial Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	[2]	274		245
Other (charges) gains, net (Note 14)		0		0
Operating profit (loss)		23		25
Equity in net earnings (loss) of affiliates		0		0
Depreciation and amortization		9		8
Capital expenditures		4		4
Goodwill and intangible assets, net		46				46
Total assets		834				861
Operating Segments [Member] | Acetyl Intermediates [Member]
Segment Reporting Information [Line Items]
Net sales		871	[2]	619	[4]
Other (charges) gains, net (Note 14)		0		53
Operating profit (loss)		231		27
Equity in net earnings (loss) of affiliates		1		1
Depreciation and amortization		26		26
Capital expenditures		30		20
Goodwill and intangible assets, net		207				202
Total assets		2,680				2,657
Operating Segments [Member] | Engineered Materials [Member]
Segment Reporting Information [Line Items]
Net sales		665		514
Other (charges) gains, net (Note 14)		0		0
Operating profit (loss)		127		104
Equity in net earnings (loss) of affiliates		54		43
Depreciation and amortization		32		25
Capital expenditures		21		10
Goodwill and intangible assets, net		1,035				902
Total assets		4,111				3,866
Corporate, Non-Segment [Member] | Other Activities [Member]
Segment Reporting Information [Line Items]
Net sales		0		0
Other (charges) gains, net (Note 14)		0		1
Operating profit (loss)		(83)		(48)
Equity in net earnings (loss) of affiliates		3		3
Depreciation and amortization		2		2
Capital expenditures		2		1
Goodwill and intangible assets, net		0				0
Total assets		1,092				991
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales		(127)		(98)
Other (charges) gains, net (Note 14)		0		0
Operating profit (loss)		(1)		0
Equity in net earnings (loss) of affiliates		0		0
Depreciation and amortization		0		0
Capital expenditures		0		0
Goodwill and intangible assets, net		0				0
Total assets		0				$ 0
Eliminations [Member] | Industrial Specialties [Member]
Segment Reporting Information [Line Items]
Net sales		2		1
Eliminations [Member] | Acetyl Intermediates [Member]
Segment Reporting Information [Line Items]
Net sales		$ 125		$ 97
[1]	Includes a decrease in accrued capital expenditures of $29 million and $21 million for the three months ended March 31, 2018 and 2017, respectively.
[2]	Includes intersegment sales of $2 million and $1 million for the three months ended March 31, 2018 and 2017, respectively.
[3]	Excludes intersegment sales of $125 million for the three months ended March 31, 2018.
[4]	Includes intersegment sales of $125 million and $97 million for the three months ended March 31, 2018 and 2017, respectively.

Revenue Recognition (Details)

Revenue Recognition (Details) $ in Millions	Mar. 31, 2018USD ($)
Revenue Recognition and Deferred Revenue [Abstract]
Revenue, remaining performance obligation	$ 910
Revenue, remaining performance obligation in year one	198
Revenue, remaining performance obligation in year two	220
Revenue, remaining performance obligation in year three and thereafter	$ 180

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregation of net sales (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Revenue, Major Customer [Line Items]
Net sales		$ 1,851	$ 1,471
Engineered Materials [Member]
Revenue, Major Customer [Line Items]
Net sales		665
Acetate Tow [Member]
Revenue, Major Customer [Line Items]
Net sales		168
Industrial Specialties [Member]
Revenue, Major Customer [Line Items]
Net sales	[1]	272
Acetyl Intermediates [Member]
Revenue, Major Customer [Line Items]
Net sales	[2]	746
Intersegment Eliminations [Member]
Revenue, Major Customer [Line Items]
Net sales		(127)	(98)
Intersegment Eliminations [Member] | Industrial Specialties [Member]
Revenue, Major Customer [Line Items]
Net sales		2	1
Intersegment Eliminations [Member] | Acetyl Intermediates [Member]
Revenue, Major Customer [Line Items]
Net sales		125	$ 97
North America [Member] | Engineered Materials [Member]
Revenue, Major Customer [Line Items]
Total net sales		179
North America [Member] | Acetate Tow [Member]
Revenue, Major Customer [Line Items]
Total net sales		35
North America [Member] | Industrial Specialties [Member]
Revenue, Major Customer [Line Items]
Total net sales		88
North America [Member] | Acetyl Intermediates [Member]
Revenue, Major Customer [Line Items]
Total net sales		202
Europe And Africa [Member] | Engineered Materials [Member]
Revenue, Major Customer [Line Items]
Total net sales		337
Europe And Africa [Member] | Acetate Tow [Member]
Revenue, Major Customer [Line Items]
Total net sales		70
Europe And Africa [Member] | Industrial Specialties [Member]
Revenue, Major Customer [Line Items]
Total net sales		136
Europe And Africa [Member] | Acetyl Intermediates [Member]
Revenue, Major Customer [Line Items]
Total net sales		181
Asia Pacific [Member] | Engineered Materials [Member]
Revenue, Major Customer [Line Items]
Total net sales		132
Asia Pacific [Member] | Acetate Tow [Member]
Revenue, Major Customer [Line Items]
Total net sales		51
Asia Pacific [Member] | Industrial Specialties [Member]
Revenue, Major Customer [Line Items]
Total net sales		44
Asia Pacific [Member] | Acetyl Intermediates [Member]
Revenue, Major Customer [Line Items]
Total net sales		334
South America [Member] | Engineered Materials [Member]
Revenue, Major Customer [Line Items]
Total net sales		17
South America [Member] | Acetate Tow [Member]
Revenue, Major Customer [Line Items]
Total net sales		12
South America [Member] | Industrial Specialties [Member]
Revenue, Major Customer [Line Items]
Total net sales		4
South America [Member] | Acetyl Intermediates [Member]
Revenue, Major Customer [Line Items]
Total net sales		$ 29
[1]	Includes intersegment sales of $2 million and $1 million for the three months ended March 31, 2018 and 2017, respectively.
[2]	Excludes intersegment sales of $125 million for the three months ended March 31, 2018.

Earnings (Loss) Per Share (Sche

Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations	$ 365	$ 183
Earnings (loss) from discontinued operations	(2)	0
Net earnings (loss)	$ 363	$ 183
Weighted average shares - basic	135,916,446	140,643,860
Incremental shares attributable to equity awards	467,289	353,543
Weighted average shares - diluted	136,383,735	140,997,403

Earnings (Loss) Per Share (Narr

Earnings (Loss) Per Share (Narrative) (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0

Consolidating Guarantor Finan97

Consolidating Guarantor Financial Information (Schedule of Consolidating Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 1,851	$ 1,471
Cost of sales	(1,336)	(1,121)
Gross profit	515	350
Selling, general and administrative expenses	(147)	(103)
Amortization of intangible assets	(6)	(4)
Research and development expenses	(18)	(17)
Other (charges) gains, net	0	(55)
Foreign exchange gain (loss), net	(1)	0
Gain (loss) on disposition of businesses and assets, net	0	(1)
Operating profit (loss)	343	170
Equity in net earnings (loss) of affiliates	58	47
Non-operating pension and other postretirement employee benefit (expense) income	26	22
Interest expense	(33)	(29)
Interest income	2	0
Dividend income - cost investments	32	29
Other income (expense), net	4	1
Earnings (loss) from continuing operations before tax	432	240
Income tax (provision) benefit	(65)	(56)
Earnings (loss) from continuing operations	367	184
Earnings (loss) from operation of discontinued operations	(2)	0
Income tax (provision) benefit from discontinued operations	0	0
Earnings (loss) from discontinued operations	(2)	0
Net earnings (loss)	365	184
Net (earnings) loss attributable to noncontrolling interests	(2)	(1)
Net earnings (loss) attributable to Celanese Corporation	363	183
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	0	0
Cost of sales	0	0
Gross profit	0	0
Selling, general and administrative expenses	0	0
Amortization of intangible assets	0	0
Research and development expenses	0	0
Other (charges) gains, net	0	0
Foreign exchange gain (loss), net	0	0
Gain (loss) on disposition of businesses and assets, net	0	0
Operating profit (loss)	0	0
Equity in net earnings (loss) of affiliates	363	183
Non-operating pension and other postretirement employee benefit (expense) income	0	0
Interest expense	0	0
Interest income	0	0
Dividend income - cost investments	0	0
Other income (expense), net	0	0
Earnings (loss) from continuing operations before tax	363	183
Income tax (provision) benefit	0	0
Earnings (loss) from continuing operations	363	183
Earnings (loss) from operation of discontinued operations	0	0
Income tax (provision) benefit from discontinued operations	0	0
Earnings (loss) from discontinued operations	0	0
Net earnings (loss)	363	183
Net (earnings) loss attributable to noncontrolling interests	0	0
Net earnings (loss) attributable to Celanese Corporation	363	183
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	0	0
Cost of sales	0	0
Gross profit	0	0
Selling, general and administrative expenses	0	0
Amortization of intangible assets	0	0
Research and development expenses	0	0
Other (charges) gains, net	0	0
Foreign exchange gain (loss), net	0	0
Gain (loss) on disposition of businesses and assets, net	0	0
Operating profit (loss)	0	0
Equity in net earnings (loss) of affiliates	360	174
Non-operating pension and other postretirement employee benefit (expense) income	0	0
Interest expense	(5)	(6)
Interest income	8	6
Dividend income - cost investments	0	0
Other income (expense), net	1	0
Earnings (loss) from continuing operations before tax	364	174
Income tax (provision) benefit	(1)	9
Earnings (loss) from continuing operations	363	183
Earnings (loss) from operation of discontinued operations	0	0
Income tax (provision) benefit from discontinued operations	0	0
Earnings (loss) from discontinued operations	0	0
Net earnings (loss)	363	183
Net (earnings) loss attributable to noncontrolling interests	0	0
Net earnings (loss) attributable to Celanese Corporation	363	183
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	600	589
Cost of sales	(464)	(445)
Gross profit	136	144
Selling, general and administrative expenses	(60)	(34)
Amortization of intangible assets	(2)	(1)
Research and development expenses	(8)	(7)
Other (charges) gains, net	0	(6)
Foreign exchange gain (loss), net	0	0
Gain (loss) on disposition of businesses and assets, net	(2)	(2)
Operating profit (loss)	64	94
Equity in net earnings (loss) of affiliates	267	101
Non-operating pension and other postretirement employee benefit (expense) income	23	20
Interest expense	(29)	(23)
Interest income	2	1
Dividend income - cost investments	0	0
Other income (expense), net	1	0
Earnings (loss) from continuing operations before tax	328	193
Income tax (provision) benefit	(37)	(63)
Earnings (loss) from continuing operations	291	130
Earnings (loss) from operation of discontinued operations	0	0
Income tax (provision) benefit from discontinued operations	0	0
Earnings (loss) from discontinued operations	0	0
Net earnings (loss)	291	130
Net (earnings) loss attributable to noncontrolling interests	0	0
Net earnings (loss) attributable to Celanese Corporation	291	130
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	1,554	1,177
Cost of sales	(1,178)	(966)
Gross profit	376	211
Selling, general and administrative expenses	(87)	(69)
Amortization of intangible assets	(4)	(3)
Research and development expenses	(10)	(10)
Other (charges) gains, net	0	(49)
Foreign exchange gain (loss), net	(1)	0
Gain (loss) on disposition of businesses and assets, net	2	1
Operating profit (loss)	276	81
Equity in net earnings (loss) of affiliates	53	43
Non-operating pension and other postretirement employee benefit (expense) income	3	2
Interest expense	(9)	(7)
Interest income	2	0
Dividend income - cost investments	32	29
Other income (expense), net	2	1
Earnings (loss) from continuing operations before tax	359	149
Income tax (provision) benefit	(27)	1
Earnings (loss) from continuing operations	332	150
Earnings (loss) from operation of discontinued operations	(2)	0
Income tax (provision) benefit from discontinued operations	0	0
Earnings (loss) from discontinued operations	(2)	0
Net earnings (loss)	330	150
Net (earnings) loss attributable to noncontrolling interests	(2)	(1)
Net earnings (loss) attributable to Celanese Corporation	328	149
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	(303)	(295)
Cost of sales	306	290
Gross profit	3	(5)
Selling, general and administrative expenses	0	0
Amortization of intangible assets	0	0
Research and development expenses	0	0
Other (charges) gains, net	0	0
Foreign exchange gain (loss), net	0	0
Gain (loss) on disposition of businesses and assets, net	0	0
Operating profit (loss)	3	(5)
Equity in net earnings (loss) of affiliates	(985)	(454)
Non-operating pension and other postretirement employee benefit (expense) income	0	0
Interest expense	10	7
Interest income	(10)	(7)
Dividend income - cost investments	0	0
Other income (expense), net	0	0
Earnings (loss) from continuing operations before tax	(982)	(459)
Income tax (provision) benefit	0	(3)
Earnings (loss) from continuing operations	(982)	(462)
Earnings (loss) from operation of discontinued operations	0	0
Income tax (provision) benefit from discontinued operations	0	0
Earnings (loss) from discontinued operations	0	0
Net earnings (loss)	(982)	(462)
Net (earnings) loss attributable to noncontrolling interests	0	0
Net earnings (loss) attributable to Celanese Corporation	$ (982)	$ (462)

Consolidating Guarantor Finan98

Consolidating Guarantor Financial Information (Schedule of Consolidating Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	$ 365	$ 184
Other comprehensive income (loss), net of tax
Foreign currency translation	49	28
Gain (loss) on cash flow hedges	(1)	(2)
Pension and postretirement benefits	1	5
Total other comprehensive income (loss), net of tax	49	31
Total comprehensive income (loss), net of tax	414	215
Comprehensive (income) loss attributable to noncontrolling interests	(2)	(1)
Comprehensive income (loss) attributable to Celanese Corporation	412	214
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	363	183
Other comprehensive income (loss), net of tax
Foreign currency translation	49	28
Gain (loss) on cash flow hedges	(1)	(2)
Pension and postretirement benefits	1	5
Total other comprehensive income (loss), net of tax	49	31
Total comprehensive income (loss), net of tax	412	214
Comprehensive (income) loss attributable to noncontrolling interests	0	0
Comprehensive income (loss) attributable to Celanese Corporation	412	214
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	363	183
Other comprehensive income (loss), net of tax
Foreign currency translation	49	28
Gain (loss) on cash flow hedges	(1)	(2)
Pension and postretirement benefits	1	5
Total other comprehensive income (loss), net of tax	49	31
Total comprehensive income (loss), net of tax	412	214
Comprehensive (income) loss attributable to noncontrolling interests	0	0
Comprehensive income (loss) attributable to Celanese Corporation	412	214
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	291	130
Other comprehensive income (loss), net of tax
Foreign currency translation	63	30
Gain (loss) on cash flow hedges	(1)	(2)
Pension and postretirement benefits	1	4
Total other comprehensive income (loss), net of tax	63	32
Total comprehensive income (loss), net of tax	354	162
Comprehensive (income) loss attributable to noncontrolling interests	0	0
Comprehensive income (loss) attributable to Celanese Corporation	354	162
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	330	150
Other comprehensive income (loss), net of tax
Foreign currency translation	74	39
Gain (loss) on cash flow hedges	(1)	(2)
Pension and postretirement benefits	1	6
Total other comprehensive income (loss), net of tax	74	43
Total comprehensive income (loss), net of tax	404	193
Comprehensive (income) loss attributable to noncontrolling interests	(2)	(1)
Comprehensive income (loss) attributable to Celanese Corporation	402	192
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	(982)	(462)
Other comprehensive income (loss), net of tax
Foreign currency translation	(186)	(97)
Gain (loss) on cash flow hedges	3	6
Pension and postretirement benefits	(3)	(15)
Total other comprehensive income (loss), net of tax	(186)	(106)
Total comprehensive income (loss), net of tax	(1,168)	(568)
Comprehensive (income) loss attributable to noncontrolling interests	0	0
Comprehensive income (loss) attributable to Celanese Corporation	$ (1,168)	$ (568)

Consolidating Guarantor Finan99

Consolidating Guarantor Financial Information (Schedule of Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2018		Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 490		$ 576	$ 501	$ 638
Trade receivables - third party and affiliates	1,205		986
Non-trade receivables, net (variable interest entity restricted - 2018: $1; 2017: $0)	271		244
Inventories, net	955		900
Marketable securities, at fair value	32		32
Other assets	53		54
Total current assets	3,006		2,792
Investments in affiliates	979		976
Property, Plant and Equipment, Net	3,801		3,762
Deferred income taxes	182		366
Other assets	369		338
Goodwill	1,107	[1]	1,003
Intangible Assets, Net (Excluding Goodwill)	336		301
Total assets	9,780		9,538
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	425		326
Trade payables - third party and affiliates	797		807
Other liabilities	266		354
Income taxes payable	114		72
Total current liabilities	1,602		1,559
Noncurrent Liabilities
Long-term debt, net of unamortized deferred financing costs	3,343		3,315
Deferred income taxes	219		211
Uncertain tax positions	152		156
Benefit obligations	582		585
Other liabilities	217		413
Total noncurrent liabilities	4,513		4,680
Total Celanese Corporation stockholders' equity	3,253		2,887
Noncontrolling interests	412		412
Total equity	3,665		3,299
Total liabilities and equity	9,780		9,538
Parent Guarantor [Member]
Current Assets
Cash and cash equivalents	0		0	0	0
Trade receivables - third party and affiliates	0		0
Non-trade receivables, net (variable interest entity restricted - 2018: $1; 2017: $0)	38		38
Inventories, net	0		0
Marketable securities, at fair value	0		0
Other assets	0		0
Total current assets	38		38
Investments in affiliates	3,215		2,850
Property, Plant and Equipment, Net	0		0
Deferred income taxes	0		0
Other assets	0		0
Goodwill	0		0
Intangible Assets, Net (Excluding Goodwill)	0		0
Total assets	3,253		2,888
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	0		0
Trade payables - third party and affiliates	0		0
Other liabilities	0		0
Income taxes payable	0		0
Total current liabilities	0		0
Noncurrent Liabilities
Long-term debt, net of unamortized deferred financing costs	0		0
Deferred income taxes	0		0
Uncertain tax positions	0		0
Benefit obligations	0		0
Other liabilities	0		0
Total noncurrent liabilities	0		0
Total Celanese Corporation stockholders' equity	3,253		2,888
Noncontrolling interests	0		0
Total equity	3,253		2,888
Total liabilities and equity	3,253		2,888
Issuer [Member]
Current Assets
Cash and cash equivalents	2		0	0	0
Trade receivables - third party and affiliates	0		0
Non-trade receivables, net (variable interest entity restricted - 2018: $1; 2017: $0)	486		482
Inventories, net	0		0
Marketable securities, at fair value	0		0
Other assets	14		60
Total current assets	502		542
Investments in affiliates	4,461		4,283
Property, Plant and Equipment, Net	0		0
Deferred income taxes	14		6
Other assets	1,519		1,295
Goodwill	0		0
Intangible Assets, Net (Excluding Goodwill)	0		0
Total assets	6,496		6,126
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	83		76
Trade payables - third party and affiliates	0		1
Other liabilities	38		71
Income taxes payable	0		0
Total current liabilities	121		148
Noncurrent Liabilities
Long-term debt, net of unamortized deferred financing costs	3,160		3,128
Deferred income taxes	0		0
Uncertain tax positions	0		0
Benefit obligations	0		0
Other liabilities	0		0
Total noncurrent liabilities	3,160		3,128
Total Celanese Corporation stockholders' equity	3,215		2,850
Noncontrolling interests	0		0
Total equity	3,215		2,850
Total liabilities and equity	6,496		6,126
Subsidiary Guarantors [Member]
Current Assets
Cash and cash equivalents	111		230	56	51
Trade receivables - third party and affiliates	160		89
Non-trade receivables, net (variable interest entity restricted - 2018: $1; 2017: $0)	301		279
Inventories, net	281		277
Marketable securities, at fair value	32		32
Other assets	8		12
Total current assets	893		919
Investments in affiliates	4,140		3,916
Property, Plant and Equipment, Net	1,181		1,145
Deferred income taxes	12		206
Other assets	214		171
Goodwill	399		314
Intangible Assets, Net (Excluding Goodwill)	82		48
Total assets	6,921		6,719
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	151		148
Trade payables - third party and affiliates	288		300
Other liabilities	264		302
Income taxes payable	501		471
Total current liabilities	1,204		1,221
Noncurrent Liabilities
Long-term debt, net of unamortized deferred financing costs	1,476		1,254
Deferred income taxes	0		0
Uncertain tax positions	9		1
Benefit obligations	273		277
Other liabilities	55		255
Total noncurrent liabilities	1,813		1,787
Total Celanese Corporation stockholders' equity	3,904		3,711
Noncontrolling interests	0		0
Total equity	3,904		3,711
Total liabilities and equity	6,921		6,719
Non-Guarantors [Member]
Current Assets
Cash and cash equivalents	377		346	445	587
Trade receivables - third party and affiliates	1,209		988
Non-trade receivables, net (variable interest entity restricted - 2018: $1; 2017: $0)	441		385
Inventories, net	719		672
Marketable securities, at fair value	0		0
Other assets	55		93
Total current assets	2,801		2,484
Investments in affiliates	861		861
Property, Plant and Equipment, Net	2,620		2,617
Deferred income taxes	159		158
Other assets	153		165
Goodwill	708		689
Intangible Assets, Net (Excluding Goodwill)	254		253
Total assets	7,556		7,227
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	466		369
Trade payables - third party and affiliates	673		598
Other liabilities	217		273
Income taxes payable	103		92
Total current liabilities	1,459		1,332
Noncurrent Liabilities
Long-term debt, net of unamortized deferred financing costs	231		233
Deferred income taxes	223		215
Uncertain tax positions	145		157
Benefit obligations	309		308
Other liabilities	162		158
Total noncurrent liabilities	1,070		1,071
Total Celanese Corporation stockholders' equity	4,615		4,412
Noncontrolling interests	412		412
Total equity	5,027		4,824
Total liabilities and equity	7,556		7,227
Eliminations [Member]
Current Assets
Cash and cash equivalents	0		0	$ 0	$ 0
Trade receivables - third party and affiliates	(164)		(91)
Non-trade receivables, net (variable interest entity restricted - 2018: $1; 2017: $0)	(995)		(940)
Inventories, net	(45)		(49)
Marketable securities, at fair value	0		0
Other assets	(24)		(111)
Total current assets	(1,228)		(1,191)
Investments in affiliates	(11,698)		(10,934)
Property, Plant and Equipment, Net	0		0
Deferred income taxes	(3)		(4)
Other assets	(1,517)		(1,293)
Goodwill	0		0
Intangible Assets, Net (Excluding Goodwill)	0		0
Total assets	(14,446)		(13,422)
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	(275)		(267)
Trade payables - third party and affiliates	(164)		(92)
Other liabilities	(253)		(292)
Income taxes payable	(490)		(491)
Total current liabilities	(1,182)		(1,142)
Noncurrent Liabilities
Long-term debt, net of unamortized deferred financing costs	(1,524)		(1,300)
Deferred income taxes	(4)		(4)
Uncertain tax positions	(2)		(2)
Benefit obligations	0		0
Other liabilities	0		0
Total noncurrent liabilities	(1,530)		(1,306)
Total Celanese Corporation stockholders' equity	(11,734)		(10,974)
Noncontrolling interests	0		0
Total equity	(11,734)		(10,974)
Total liabilities and equity	$ (14,446)		$ (13,422)
[1]	There were $0 million of accumulated impairment losses as of March 31, 2018.

Consolidating Guarantor Fina100

Consolidating Guarantor Financial Information (Schedule of Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 143	$ 192
Investing Activities
Capital expenditures on property, plant and equipment	(86)	(62)
Acquisitions, net of cash acquired	(144)	0
Proceeds from sale of businesses and assets, net	9	1
Return of capital from subsidiary	0	0
Contributions to subsidiary	0	0
Intercompany loan receipts (disbursements)	0	0
Other, net	(14)	(3)
Net cash provided by (used in) investing activities	(235)	(64)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	101	6
Proceeds from short-term borrowings	36	7
Repayments of short-term borrowings	(38)	(29)
Proceeds from long-term debt	0	0
Repayments of long-term debt	(31)	(53)
Purchases of treasury stock, including related fees	0	(128)
Dividends to parent	0	0
Contributions from parent	0	0
Series A common stock dividends	(63)	(51)
Return of capital to parent	0	0
(Distributions to) contributions from noncontrolling interests	(2)	(4)
Other, net	(5)	(18)
Net cash provided by (used in) financing activities	(2)	(270)
Exchange rate effects on cash and cash equivalents	8	5
Net increase (decrease) in cash and cash equivalents	(86)	(137)
Cash and cash equivalents as of beginning of period	576	638
Cash and cash equivalents as of end of period	490	501
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	63	179
Investing Activities
Capital expenditures on property, plant and equipment	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sale of businesses and assets, net	0	0
Return of capital from subsidiary	0	0
Contributions to subsidiary	0	0
Intercompany loan receipts (disbursements)	0	0
Other, net	0	0
Net cash provided by (used in) investing activities	0	0
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	0	0
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings	0	0
Proceeds from long-term debt	0	0
Repayments of long-term debt	0	0
Purchases of treasury stock, including related fees	0	(128)
Dividends to parent	0	0
Contributions from parent	0	0
Series A common stock dividends	(63)	(51)
Return of capital to parent	0	0
(Distributions to) contributions from noncontrolling interests	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	(63)	(179)
Exchange rate effects on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents as of beginning of period	0	0
Cash and cash equivalents as of end of period	0	0
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	277	196
Investing Activities
Capital expenditures on property, plant and equipment	0	0
Acquisitions, net of cash acquired	0	(11)
Proceeds from sale of businesses and assets, net	0	0
Return of capital from subsidiary	0	0
Contributions to subsidiary	0	0
Intercompany loan receipts (disbursements)	(222)	0
Other, net	0	0
Net cash provided by (used in) investing activities	(222)	(11)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	15	(7)
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings	0	0
Proceeds from long-term debt	0	0
Repayments of long-term debt	(6)	0
Purchases of treasury stock, including related fees	0	0
Dividends to parent	(62)	(178)
Contributions from parent	0	0
Series A common stock dividends	0	0
Return of capital to parent	0	0
(Distributions to) contributions from noncontrolling interests	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	(53)	(185)
Exchange rate effects on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	2	0
Cash and cash equivalents as of beginning of period	0	0
Cash and cash equivalents as of end of period	2	0
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(33)	210
Investing Activities
Capital expenditures on property, plant and equipment	(54)	(42)
Acquisitions, net of cash acquired	(144)	0
Proceeds from sale of businesses and assets, net	0	0
Return of capital from subsidiary	211	5
Contributions to subsidiary	(16)	0
Intercompany loan receipts (disbursements)	(15)	7
Other, net	(3)	0
Net cash provided by (used in) investing activities	(21)	(30)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	2	6
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings	0	0
Proceeds from long-term debt	222	0
Repayments of long-term debt	(12)	0
Purchases of treasury stock, including related fees	0	0
Dividends to parent	(272)	(165)
Contributions from parent	0	0
Series A common stock dividends	0	0
Return of capital to parent	0	0
(Distributions to) contributions from noncontrolling interests	0	0
Other, net	(5)	(16)
Net cash provided by (used in) financing activities	(65)	(175)
Exchange rate effects on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(119)	5
Cash and cash equivalents as of beginning of period	230	51
Cash and cash equivalents as of end of period	111	56
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	170	130
Investing Activities
Capital expenditures on property, plant and equipment	(32)	(20)
Acquisitions, net of cash acquired	0	0
Proceeds from sale of businesses and assets, net	9	12
Return of capital from subsidiary	0	0
Contributions to subsidiary	0	0
Intercompany loan receipts (disbursements)	0	0
Other, net	(11)	(3)
Net cash provided by (used in) investing activities	(34)	(11)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	99	0
Proceeds from short-term borrowings	36	7
Repayments of short-term borrowings	(38)	(29)
Proceeds from long-term debt	0	0
Repayments of long-term debt	(13)	(53)
Purchases of treasury stock, including related fees	0	0
Dividends to parent	0	(180)
Contributions from parent	16	0
Series A common stock dividends	0	0
Return of capital to parent	(211)	(5)
(Distributions to) contributions from noncontrolling interests	(2)	(4)
Other, net	0	(2)
Net cash provided by (used in) financing activities	(113)	(266)
Exchange rate effects on cash and cash equivalents	8	5
Net increase (decrease) in cash and cash equivalents	31	(142)
Cash and cash equivalents as of beginning of period	346	587
Cash and cash equivalents as of end of period	377	445
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(334)	(523)
Investing Activities
Capital expenditures on property, plant and equipment	0	0
Acquisitions, net of cash acquired	0	11
Proceeds from sale of businesses and assets, net	0	(11)
Return of capital from subsidiary	(211)	(5)
Contributions to subsidiary	16	0
Intercompany loan receipts (disbursements)	237	(7)
Other, net	0	0
Net cash provided by (used in) investing activities	42	(12)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	(15)	7
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings	0	0
Proceeds from long-term debt	(222)	0
Repayments of long-term debt	0	0
Purchases of treasury stock, including related fees	0	0
Dividends to parent	334	523
Contributions from parent	(16)	0
Series A common stock dividends	0	0
Return of capital to parent	211	5
(Distributions to) contributions from noncontrolling interests	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	292	535
Exchange rate effects on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents as of beginning of period	0	0
Cash and cash equivalents as of end of period	$ 0	$ 0