10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended December 31, 2018

or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                  to                 

Commission file number 1-5667

Cabot Corporation

(Exact name of registrant as specified in its charter)

Delaware	04-2271897
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

Two Seaport Lane Boston, Massachusetts	02210-2019
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (617) 345-0100

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

The Company had 59,520,108 shares of common stock, $1.00 par value per share, outstanding as of February 5, 2019.

INDEX

Part I.	Financial Information
	Item 1.	Financial Statements (unaudited)
		Consolidated Statements of Operations	3
		Consolidated Statements of Comprehensive Income	4
		Consolidated Balance Sheets	5
		Consolidated Statements of Cash Flows	7
		Consolidated Statements of Changes in Stockholders’ Equity	8
		Notes to the Consolidated Financial Statements	9
	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	29
	Item 3.	Quantitative and Qualitative Disclosures About Market Risk	39
	Item 4.	Controls and Procedures	39
Part II.	Other Information
	Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	40
	Item 6.	Exhibits	40

2

Part I. Financial Information

Item 1. Financial Statements

CABOT CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

UNAUDITED

	Three Months Ended December 31
	2018			2017
	(In millions, except per share amounts)
Net sales and other operating revenues	$	821		$	720
Cost of sales		655			544
Gross profit		166			176
Selling and administrative expenses		73			70
Research and technical expenses		16			15
Income (loss) from operations		77			91
Interest and dividend income		2			3
Interest expense		(15	)		(13	)
Other income (expense)		6			11
Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies		70			92
(Provision) benefit for income taxes		7			(205	)
Equity in earnings of affiliated companies, net of tax		—			1
Net income (loss)		77			(112	)
Net income (loss) attributable to noncontrolling interests, net of tax		8			10
Net income (loss) attributable to Cabot Corporation	$	69		$	(122	)
Weighted-average common shares outstanding:
Basic		59.9			61.9
Diluted		60.1			61.9
Earnings per common share:
Basic	$	1.14		$	(1.98	)
Diluted	$	1.14		$	(1.98	)
Dividends per common share	$	0.33		$	0.315

The accompanying notes are an integral part of these consolidated financial statements.

3

CABOT CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

UNAUDITED

	Three Months Ended December 31
	2018			2017
	(In millions)
Net income (loss)	$	77		$	(112	)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of tax provision (benefit) of $2 and $(2)		(24	)		—
Derivatives: net investment hedges
(Gains) losses reclassified to interest expense, net of tax provision (benefit) of $— and $—		(1	)		(1	)
Pension and other postretirement benefit liability adjustments
Pension and other postretirement benefit liability adjustments arising during the period, net of tax		22			—
Other comprehensive income (loss)		(3	)		(1	)
Comprehensive income (loss)		74			(113	)
Net income (loss) attributable to noncontrolling interests, net of tax		8			10
Foreign currency translation adjustment attributable to noncontrolling interests, net of tax		—			3
Comprehensive income (loss) attributable to noncontrolling interests, net of tax		8			13
Comprehensive income (loss) attributable to Cabot Corporation	$	66		$	(126	)

The accompanying notes are an integral part of these consolidated financial statements.

4

CABOT CORPORATION

CONSOLIDATED BALANCE SHEETS

ASSETS

UNAUDITED

	December 31, 2018		September 30, 2018
	(In millions)
Current assets:
Cash and cash equivalents	$	142	$	175
Accounts and notes receivable, net of reserve for doubtful accounts of $6 and $7		588		637
Inventories:
Raw materials		146		129
Work in process		3		3
Finished goods		390		329
Other		50		50
Total inventories		589		511
Prepaid expenses and other current assets		62		63
Total current assets		1,381		1,386
Property, plant and equipment, net		1,298		1,296
Goodwill		90		93
Equity affiliates		49		52
Intangible assets, net		94		98
Assets held for rent		125		118
Deferred income taxes		151		134
Other assets		67		67
Total assets	$	3,255	$	3,244

The accompanying notes are an integral part of these consolidated financial statements.

5

CABOT CORPORATION

CONSOLIDATED BALANCE SHEETS

LIABILITIES AND STOCKHOLDERS’ EQUITY

UNAUDITED

	December 31, 2018			September 30, 2018
	(In millions, except share
	and per share amounts)
Current liabilities:
Short-term borrowings	$	515		$	249
Accounts payable and accrued liabilities		521			613
Income taxes payable		14			29
Current portion of long-term debt		5			35
Redeemable preferred stock		—			26
Total current liabilities		1,055			952
Long-term debt		671			719
Deferred income taxes		42			42
Other liabilities		211			252
Commitments and contingencies (Note G)
Stockholders’ equity:
Preferred stock:
Authorized: 2,000,000 shares of $1 par value		—			—
Issued and Outstanding: None and none
Common stock:
Authorized: 200,000,000 shares of $1 par value
Issued: 59,709,462 and 60,566,375 shares
Outstanding: 59,509,656 and 60,366,569 shares		60			61
Less cost of 199,806 and 199,806 shares of common treasury stock		(7	)		(7	)
Additional paid-in capital		—			—
Retained earnings		1,410			1,417
Accumulated other comprehensive income (loss)		(320	)		(317	)
Total Cabot Corporation stockholders’ equity		1,143			1,154
Noncontrolling interests		133			125
Total stockholders’ equity		1,276			1,279
Total liabilities and stockholders’ equity	$	3,255		$	3,244

The accompanying notes are an integral part of these consolidated financial statements.

6

CABOT CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

UNAUDITED

	Three Months Ended December 31
	2018			2017
	(In millions)
Cash Flows from Operating Activities:
Net income (loss)	$	77		$	(112	)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization		35			39
Deferred tax provision (benefit)		(23	)		186
Gain on sale of investments		—			(10	)
Employee benefit plan settlement		6			—
Equity in net income of affiliated companies		—			(1	)
Non-cash compensation		5			6
Changes in assets and liabilities:
Accounts and notes receivable		47			(19	)
Inventories		(83	)		(41	)
Prepaid expenses and other current assets		(2	)		(4	)
Accounts payable and accrued liabilities		(75	)		10
Income taxes payable		(15	)		(3	)
Other liabilities		(12	)		(10	)
Cash dividends received from equity affiliates		1			4
Cash provided (used) by operating activities		(39	)		45
Cash Flows from Investing Activities:
Additions to property, plant and equipment		(54	)		(52	)
Cash paid for acquisition of business, net of cash acquired of $— and $1		—			(64	)
Proceeds from sale of investments		—			10
Change in assets held for rent		(1	)		—
Other		1			5
Cash used by investing activities		(54	)		(101	)
Cash Flows from Financing Activities:
Borrowings under financing arrangements		18			—
Proceeds from (repayments of) issuance of commercial paper, net		248			—
Repayments of long-term debt		(74	)		—
Repayments of redeemable preferred stock		(25	)		—
Purchases of common stock		(62	)		(16	)
Cash dividends paid to noncontrolling interests		(11	)		—
Cash dividends paid to common stockholders		(20	)		(20	)
Cash provided (used) by financing activities		74			(36	)
Effects of exchange rate changes on cash		(14	)		1
Increase (decrease) in cash and cash equivalents		(33	)		(91	)
Cash and cash equivalents at beginning of period		175			280
Cash and cash equivalents at end of period	$	142		$	189

The accompanying notes are an integral part of these consolidated financial statements.

7

CABOT CORPORATION

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

UNAUDITED

	Common Stock, Net of Treasury Stock						Additional Paid-in			Retained			Accumulated Other Comprehensive			Total Cabot Corporation Stockholders’			Noncontrolling		Total Stockholders’
	Shares			Cost			Capital			Earnings			Income (Loss)			Equity			Interests		Equity
	(In millions, except share amounts)
Balance at September 30, 2018		60,367		$	54		$	—		$	1,417		$	(317	)	$	1,154		$	125	$	1,279
Net income (loss)											69						69			8		77
Total other comprehensive income (loss)														(3	)		(3	)		—		(3	)
Cash dividends paid to common stockholders											(20	)					(20	)		—		(20	)
Issuance of stock under equity compensation plans		344			—			—									—					—
Amortization of share-based compensation								5									5					5
Purchase and retirement of common stock		(1,201	)		(1	)		(5	)		(56	)					(62	)				(62	)
Balance at December 31, 2018		59,510		$	53		$	—		$	1,410		$	(320	)	$	1,143		$	133	$	1,276

	Common Stock, Net of Treasury Stock					Additional Paid-in			Retained			Accumulated Other Comprehensive			Total Cabot Corporation Stockholders’			Noncontrolling			Total Stockholders’
	Shares			Cost		Capital			Earnings			Income (Loss)			Equity			Interests			Equity
	(In millions, except share amounts)
Balance at September 30, 2017		61,884		$	56	$	—		$	1,707		$	(259	)	$	1,504		$	121		$	1,625
Net income (loss)										(122	)					(122	)		10			(112	)
Total other comprehensive income (loss)													(4	)		(4	)		3			(1	)
Cash dividends paid to common stockholders										(20	)					(20	)					(20	)
Cash dividends declared to noncontrolling interests																			(10	)		(10	)
Issuance of stock under equity compensation plans		178			—		—									—						—
Amortization of share-based compensation							6									6						6
Purchase and retirement of common stock		(265	)		—		(6	)		(10	)					(16	)					(16	)
Balance at December 31, 2017		61,797		$	56	$	—		$	1,555		$	(263	)	$	1,348		$	124		$	1,472

The accompanying notes are an integral part of these consolidated financial statements.

8

CABOT CORPORATION

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

DECEMBER 31, 2018

UNAUDITED

A. Basis of Presentation

The consolidated financial statements have been prepared in conformity with accounting policies generally accepted in the United States (“U.S.”) and include the accounts of Cabot Corporation (“Cabot” or the “Company”) and its wholly owned subsidiaries and majority-owned and controlled U.S. and non-U.S. subsidiaries. Additionally, Cabot considers consolidation of entities over which control is achieved through means other than voting rights. Intercompany transactions have been eliminated in consolidation.

The unaudited consolidated financial statements have been prepared in accordance with the requirements of Form 10-Q and consequently do not include all disclosures required by Form 10-K. Additional information may be obtained by referring to Cabot’s Annual Report on Form 10-K for its fiscal year ended September 30, 2018 (“2018 10-K”).

The financial information submitted herewith is unaudited and reflects all adjustments which are, in the opinion of management, necessary to provide a fair statement of the results for the interim periods ended December 31, 2018 and 2017. All such adjustments are of a normal recurring nature. The results for interim periods are not necessarily indicative of the results to be expected for the fiscal year.

Effective October 1, 2018, the Company adopted the new revenue recognition standard that amended the pre-existing accounting standard for revenue recognition. The Company used a modified retrospective approach, which is discussed in further detail in Note B.

Effective October 1, 2018, the Company adopted the new pension standard that amended the requirements on the presentation of net periodic pension and postretirement benefit costs. The Company used a retrospective transition method to reclassify net periodic benefit cost, other than the service component, from Cost of sales, Selling and administrative expenses and Research and technical expenses to Other income (expense) in the Consolidated Statements of Income for the prior periods presented, which is discussed in further detail in Note B.

In October 2018, the Company realigned its business reporting structure under the Performance Chemicals segment and now combines the specialty carbons, fumed metal oxides and aerogel product lines into the Performance Additives business, and the specialty compounds and inkjet product lines into the Formulated Solutions business. Prior period Performance Chemicals segment revenue results have been recast to reflect the realignment.

B. Significant Accounting Policies

Revenue Recognition

Cabot recognizes revenue when its customers obtain control of promised goods or services. The revenue recognized is the amount of consideration which the Company expects to receive in exchange for those goods or services. Cabot derives the majority of its revenues from contracts for the sale of products from its Reinforcement Materials, Performance Chemicals and Purification Solutions segments. The Company’s contracts with customers are generally for products only and do not include other performance obligations. Generally, Cabot considers purchase orders, which in some cases are governed by master supply agreements, to be contracts with customers. The transaction price as specified on the purchase order or sales contract is considered the standalone selling price for each distinct product. To determine the transaction price at the time when revenue is recognized, the Company evaluates whether the price is subject to adjustments, such as for returns, discounts or volume rebates, which are stated in the customer contract, to determine the net consideration to which the Company expects to be entitled. Revenue from product sales is recognized based on a point in time model when control of the product is transferred to the customer, which typically occurs upon shipment or delivery of the product to the customer and title, risk and rewards of ownership have passed to the customer. Payment terms typically range from zero to ninety days.

Shipping and handling activities that occur after the transfer of control to the customer are billed to customers and are recorded as sales revenue, as the Company considers these to be fulfillment costs. Shipping and handling costs are expensed in the period incurred and included in Cost of sales within the Consolidated Statement of Operations. Taxes collected on sales to customers are excluded from the transaction price.

The Company generally provides a warranty that its products will substantially conform to the identified specifications. The Company’s liability typically is limited to either a credit equal to the purchase price or replacement of the non-conforming product. Returns under warranty have historically been immaterial.

9

Revenue in the Specialty Fluids segment arises primarily from the rental of cesium formate. This revenue is recognized throughout the rental period based on the contracted rental terms. During the three months ended December 31, 2018, the Company recognized revenue of $8 million related to the rental of cesium formate. Customers are also billed and revenue is recognized, typically at the end of the rental period, for cesium formate product that is not returned. The Company also generates revenues from cesium formate sold outside of the rental process and from the sale of fine cesium chemicals. This revenue is recognized when control of the product transfers to the customer, which is typically upon delivery of the product.

The Company does not have contract assets or liabilities that are material.

As permitted by the revenue recognition standard, Revenue from Contracts with Customers, when the period of time between the transfer of control of the goods and the time the customer pays for the goods is one year or less, the Company does not consider there to be a significant financing component associated with the contract.

Intangible Assets and Goodwill Impairment

The Company records tangible and intangible assets acquired and liabilities assumed in business combinations under the acquisition method of accounting. Amounts paid for an acquisition are allocated to the assets acquired and liabilities assumed based on their fair values at the date of acquisition. The Company uses assumptions and estimates in determining the fair value of assets acquired and liabilities assumed in a business combination. The determination of the fair value of intangible assets requires the use of significant judgment with regard to assumptions used in the valuation model. The Company estimates the fair value of identifiable acquisition-related intangible assets principally based on projections of cash flows that will arise from these assets. The projected cash flows are discounted to determine the fair value of the assets at the dates of acquisition.

Definite-lived intangible assets, which are comprised of trademarks, customer relationships and developed technologies, are amortized over their estimated useful lives and are reviewed for impairment when indication of potential impairment exists, such as a significant reduction in cash flows associated with the assets.

Goodwill is comprised of the purchase price of business acquisitions in excess of the fair value assigned to the net tangible and identifiable intangible assets acquired. Goodwill is not amortized, but is reviewed for impairment annually as of May 31, or when events or changes in the business environment indicate that the carrying value of the reporting unit may exceed its fair value. A reporting unit, for the purpose of the impairment test, is at or below the operating segment level, and constitutes a business for which discrete financial information is available and regularly reviewed by segment management. Reinforcement Materials, and the fumed metal oxides and specialty compounds product lines within Performance Chemicals, which are considered separate reporting units, carry the Company’s goodwill balances as of December 31, 2018.

For the purpose of the goodwill impairment test, the Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If an initial qualitative assessment identifies that it is more likely than not that the carrying value of a reporting unit exceeds its estimated fair value, an additional quantitative evaluation is performed. Alternatively, the Company may elect to proceed directly to the quantitative goodwill impairment test. If based on the quantitative evaluation the fair value of the reporting unit is less than its carrying amount, a goodwill impairment loss would result. The goodwill impairment loss would be the amount by which the carrying value of the reporting unit, including goodwill, exceeds its fair value, limited to the total amount of goodwill allocated to that reporting unit. The fair value of a reporting unit is based on discounted estimated future cash flows. The fair value is also benchmarked against a market approach using the guideline public companies method. The assumptions used to estimate fair value include management’s best estimates of future growth rates, operating cash flows, capital expenditures and discount rates over an estimate of the remaining operating period at the reporting unit level. Based on the Company’s most recent annual goodwill impairment test performed as of May 31, 2018, the fair values of the Reinforcement Materials, Fumed Metal Oxides and Specialty Compounds reporting units were substantially in excess of their carrying values. No events occurred subsequent to the last impairment evaluation that would suggest that it is more likely than not that the carrying values of any of the Company’s reporting units exceeded their fair value.

Long-lived Assets Impairment

The Company’s long-lived assets primarily include property, plant and equipment, intangible assets, long-term investments and assets held for rent. The carrying values of long-lived assets are reviewed for impairment whenever events or changes in business circumstances indicate that the carrying amount of an asset may not be recoverable.

To test for impairment of assets, the Company generally uses a probability-weighted estimate of the future undiscounted net cash flows of the assets over their remaining lives to determine if the value of the asset is recoverable. Long-lived assets are grouped with other assets and liabilities at the lowest level for which independent identifiable cash flows are determinable.

10

An asset impairment is recognized when the carrying value of the asset is not recoverable based on the analysis described above, in which case the asset is written down to its fair value. If the asset does not have a readily determinable market value, a discounted cash flow model may be used to determine the fair value of the asset. In circumstances when an asset does not have separately identifiable cash flows, an impairment charge is recorded when the Company no longer intends to use the asset.

The Company continues to pursue strategic options for its Purification Solutions business. Depending on the actions taken, there could be a negative impact on the fair value of the Purification Solution reporting unit, which may lead to impairment.

Property, Plant and Equipment

Property, plant and equipment are recorded at cost. Depreciation of property, plant and equipment is calculated using the straight-line method over the estimated useful lives of the related assets. The depreciable lives for buildings, machinery and equipment, and other fixed assets are between twenty and twenty-five years, ten and twenty-five years, and three and twenty-five years, respectively. The cost and accumulated depreciation for property, plant and equipment sold, retired, or otherwise disposed of are removed from the Consolidated Balance Sheets and resulting gains or losses are included in earnings in the Consolidated Statements of Operations. Expenditures for repairs and maintenance are charged to expenses as incurred. Expenditures for major renewals and betterments, which significantly extend the useful lives of existing plant and equipment, are capitalized and depreciated.

Income Tax in Interim Periods

The Company records its tax provision or benefit on an interim basis using an estimated annual effective tax rate. This rate is applied to the current period ordinary income or loss to determine the income tax provision or benefit allocated to the interim period. Losses from jurisdictions for which no benefit can be recognized and the income tax effects of unusual or infrequent items are excluded from the estimated annual effective tax rate and are recognized in the impacted interim period.

Valuation allowances are provided against the future tax benefits that arise from the deferred tax assets in jurisdictions for which no benefit can be recognized. The estimated annual effective tax rate may be significantly impacted by nondeductible expenses and the Company’s projected earnings mix by tax jurisdiction. Adjustments to the estimated annual effective income tax rate are recognized in the period when such estimates are revised.

Inventory Valuation

Inventories are stated at the lower of cost or market. The cost of Specialty Fluids inventories that are classified as assets held for rent is determined using the average cost method. The cost of all other inventories is determined using the FIFO method.

Cabot periodically reviews inventory for both potential obsolescence and potential declines in anticipated selling prices. In this review, the Company makes assumptions about the future demand for and market value of the inventory, and based on these assumptions estimates the amount of any obsolete, unmarketable, slow moving, or overvalued inventory. Cabot writes down the value of these inventories by an amount equal to the difference between the cost of the inventory and its estimated net realizable value.

Pensions and Other Postretirement Benefits

The Company recognizes the funded status of defined benefit pension and other postretirement benefit plans as an asset or liability. This amount is defined as the difference between the fair value of plan assets and the benefit obligation. The Company is required to recognize as a component of Other comprehensive income (loss), net of tax, the actuarial gains/losses and prior service costs/credits that arise but were not previously required to be recognized as components of net periodic benefit cost. Other comprehensive income (loss) is adjusted as these amounts are later recognized in income as components of net periodic benefit cost.

Redeemable Preferred Stock

In November 2013, the Company purchased all of its joint venture partner’s common stock in the former NHUMO, S.A. de C.V. (“NHUMO”) joint venture. At the close of the transaction, NHUMO issued redeemable preferred stock to the joint venture partner with a repurchase value of $25 million and a fixed dividend rate of 6% per annum. In November 2018, the preferred stock was repurchased for $25 million and a final dividend payment of approximately $1.4 million was made. The preferred stock was accounted for as a financing obligation and was separately presented in the Consolidated Balance Sheets as a current liability as of September 30, 2018.

Accumulated Other Comprehensive Income (Loss)

Accumulated other comprehensive income (loss) (“AOCI”), which is included as a component of stockholders’ equity, includes unrealized gains or losses on available-for-sale marketable securities and derivative instruments, currency translation adjustments in foreign subsidiaries, translation adjustments on foreign equity securities and minimum pension liability adjustments.

11

Recently Adopted Accounting Standards

In May 2014, the FASB issued a new standard, Revenue from Contracts with Customers, that amended the existing accounting standards for revenue recognition. The standard requires entities to recognize revenue when they transfer promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. This standard is applicable for fiscal years beginning after December 15, 2017. The Company adopted this standard on October 1, 2018 and applied a modified retrospective approach. The comparative information has not been restated and continues to be reported under the accounting standards in effect during those periods, as discussed in the Company’s 2018 10-K.

The adoption of this standard did not have an impact on how the Company recognizes revenue. As such, an adjustment to opening retained earnings was not required as a result of adopting this new standard. The Company implemented the updates that were necessary to its revenue recognition policy, internal controls, processes and financial statement disclosures as part of this adoption. The updated disclosures are reflected under the heading “Revenue Recognition” within Note B and the Company’s disaggregated revenue is reflected within Note N.

In addition, as part of an assessment performed in connection with adopting this standard, the Company reviewed its classification of by-product sales, which consist of sales generated from the production of steam or electricity from the Company’s energy centers primarily from its carbon black manufacturing sites and sales of hydrochloric acid generated from the production of fumed silica. Historically, the Company presented by-product sales as a reduction of Cost of sales within the Consolidated Statement of Operations. However, upon further evaluation of these sales in connection with the implementation of this standard, the Company determined that it is appropriate to present by-product sales as Net sales and other operating revenues. Effective October 1, 2018, these sales are now included within Net sales and other operating revenues in the Consolidated Statement of Operations. This change did not result in a cumulative adjustment to opening retained earnings as it is a classification change within the Consolidated Statement of Operations. If the Company had continued to classify by-product sales within Cost of sales, there would have been a decrease to Net sales and other operating revenues and Cost of sales of $20 million for the three months ended December 31, 2018.

In August 2016, the FASB issued final amendments to clarify how entities should classify certain cash receipts and cash payments on the statement of cash flows, such as distributions received from equity method investees, proceeds from the settlement of insurance claims, and proceeds from the settlement of corporate-owned life insurance policies. The new standard is effective for fiscal years beginning after December 15, 2017, including interim periods within those years, and early adoption is permitted. The Company adopted this standard on October 1, 2018. The adoption of this standard did not have a material impact to the Company’s consolidated financial statements.

In March 2017, the FASB issued a new standard that amends the requirements on the presentation of net periodic pension and postretirement benefit costs. The new standard requires the service cost component to be presented with other employee compensation costs. The other components will be reported separately outside of operations. Only the service cost component will be eligible for capitalization. Entities are required to use a retrospective transition method to adopt the requirement for separate income statement presentation of the service cost and other components, and a prospective transition method to adopt the requirement to limit the capitalization of benefit cost to the service component. The Company adopted the standard on October 1, 2018 and used a retrospective transition method to reclassify net periodic benefit cost, other than the service component, from Cost of sales, Selling and administrative expenses and Research and technical expenses to Other income (expense) in the Consolidated Statements of Operations for the prior periods presented. In accordance with the standard, the Company utilized prior period footnote disclosures as a practical expedient to apply these retrospective presentations, which is shown in the table below:

Consolidated Statements of Operations	Three Months Ended December 31
	2017
	As Originally Reported		Effect of Change			As Adjusted
	(In millions, except per share amounts)
Cost of sales	$	542	$	2		$	544
Gross profit	$	178	$	(2	)	$	176
Selling and administrative expenses	$	69	$	1		$	70
Research and technical expenses	$	15	$	—		$	15
Income (loss) from operations	$	94	$	(3	)	$	91
Other income (expense)	$	8	$	3		$	11

12

Recent Accounting Pronouncements

In February 2016, the FASB issued a new standard for the accounting for leases. This new standard requires lessees to recognize assets and liabilities for most leases, but recognize expenses on their income statements in a manner that is similar to the current accounting treatment for leases. The standard is applicable for fiscal years beginning after December 15, 2018 and for interim periods within those years, and early adoption is permitted. The Company expects to adopt the standard on October 1, 2019. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements. The Company has established a project plan and implementation team which will analyze the current portfolio of leases to determine the impact of adopting this new standard. The implementation team will also be responsible for evaluating and designing the necessary changes to the Company’s business processes, lease policies, systems and internal controls to support recognition and disclosure under the new guidance.

In February 2018, the FASB issued a new standard that allows entities to reclassify from AOCI to Retained earnings stranded tax effects resulting from changes made as a result of the Tax Cuts and Jobs Act of 2017 (the “Act”). The amendments in this new standard also require certain disclosures about stranded tax effects. The new standard is effective for all entities for fiscal years beginning after December 15, 2018, including interim periods within those years, and early adoption is permitted. The Company is evaluating this standard and the timing of its adoption. The adoption of this standard is not expected to materially impact the Company’s consolidated financial statements.

In August 2018, the FASB issued a new standard to align the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The updated guidance also requires an entity to expense the capitalized implementation costs of a cloud computing arrangement that is a service contract over the term of the arrangement and includes expanded disclosure requirements for such costs. This guidance is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted, and the guidance may be applied either retrospectively or prospectively. The Company is evaluating this standard and the timing of its adoption. The Company does not expect the adoption of this guidance to have a material impact on its consolidated financial statements and related disclosures.

C. Acquisitions

Tech Blend

In November 2017, the Company acquired Tech Blend, a North American producer of black masterbatches, for a purchase price of $65 million, paid in cash. The purchase price was subject to a working capital adjustment, which was immaterial. The operating results of the business are included in the Company’s Performance Chemicals segment. The acquisition extended the Company’s global footprint in black masterbatch and compounds and provides a platform to serve global customers and grow in conductive formulations.

The allocation of the purchase price set forth below was based on estimates of the fair value of assets acquired and liabilities assumed.

	(In millions)
Assets
Cash	$	1
Accounts receivable		5
Inventories		3
Property, plant and equipment		7
Intangible assets		29
Goodwill		33
Total assets acquired		78
Liabilities
Current liabilities		(3	)
Deferred tax liabilities		(10	)
Total liabilities assumed		(13	)
Cash consideration paid	$	65

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As part of the purchase price allocation, the Company determined the separately identifiable intangible assets are comprised of developed technologies of $21 million, which will be amortized over twenty-five years, and customer relationships of $8 million, which will be amortized over twelve years. The Company estimated the fair values of the identifiable acquisition-related intangible assets based on projections of cash flows that will arise from those assets. The projected cash flows were discounted to determine the fair value of the assets at the date of acquisition. The determination of the fair value of the intangible assets acquired required the use of significant judgment with regard to (i) assumptions in the discounted cash flow model used and (ii) determination of the useful lives of the developed technologies and customer relationships.

The excess of the purchase price over the fair value of the tangible net assets and intangible assets acquired was recorded as goodwill. The goodwill recognized is attributable to the growth and operating synergies that the Company expects to realize from this acquisition. Goodwill generated from the acquisition is not deductible for tax purposes.

NSCC Carbon (Jiangsu) Co. Ltd

In September 2018, the Company acquired NSCC Carbon, a carbon black manufacturing facility in Pizhou, Jiangsu Province, China for a purchase price of $8 million. The purchase price is payable upon satisfaction of certain conditions that are expected to be satisfied in less than twelve months and is recorded within Accounts payable and accrued liabilities on the Consolidated Balance Sheets. The Company plans to modify this manufacturing facility to produce specialty carbons. The plant is temporarily mothballed. The modifications are expected to be completed, and production is expected to commence, in 2021. The Company has incurred $2 million of transition-related costs in the first quarter of fiscal 2019 related to this acquisition.

D. Employee Benefit Plans

Net periodic defined benefit pension and other postretirement benefit costs include the following:

	Three Months Ended December 31
	2018						2017						2018				2017
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.		Foreign		U.S.			Foreign
	(In millions)
Service cost	$	—		$	2		$	—		$	2		$	—	$	—	$	—		$	—
Interest cost		1			2			1			2			—		—		—			—
Expected return on plan assets		(2	)		(4	)		(2	)		(4	)		—		—		—			—
Amortization of prior service credit		—			—			—			—			—		—		(1	)		—
Amortization of actuarial loss		—			1			—			1			—		—		—			—
Settlement and curtailment gain		—			(6	)		—			—			—		—		—			—
Net periodic benefit (credit) cost	$	(1	)	$	(5	)	$	(1	)	$	1		$	—	$	—	$	(1	)	$	—

Curtailments and Settlements of Employee Benefit Plans

In December 2018, the Company transferred the majority of the defined benefit obligations and pension plan assets in one of its foreign defined benefit plans to a multi-employer plan. This action moved the administrative, asset custodial, asset investment, actuarial, communication and benefit payment obligations to the multi-employer fund administrator. As a result of the transfer, there was a $30 million reduction in net pension obligations associated with the plan, and a pre-tax gain of $6 million was recorded in the first quarter of fiscal 2019, which is included in Other income (expense) in the Consolidated Statement of Operations. The pre-tax gain consisted of a curtailment credit of less than $1 million for the accelerated recognition of prior service credit and a settlement credit of $5 million for the accelerated recognition of the unrecognized gain upon the transfer of the assets. As of December 31, 2018, approximately $8 million of plan assets remain to be transferred. Such assets are expected to be transferred by the third quarter of fiscal 2019 and such transfer may result in an additional immaterial settlement gain or loss. In addition, as part of the transfer the Company recorded a $3 million charge for the Company’s agreement to fund the actuarial loss gap between the terminated plan and the multi-employer plan, which will be paid over the next five years. This charge is included Other income (expense) in the Consolidated Statement of Operations and the liability is included in Accounts payable and accrued liabilities and Other liabilities on the Consolidated Balance Sheet.

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E. Goodwill and Intangible Assets

The carrying amount of goodwill attributable to each reportable segment with goodwill balances and the changes in those balances during the three month period ended December 31, 2018 are as follows:

	Reinforcement Materials			Performance Chemicals			Total
	(In millions)
Balance at September 30, 2018	$	52		$	41		$	93
Foreign currency impact		(2	)		(1	)		(3	)
Balance at December 31, 2018	$	50		$	40		$	90

The following table provides information regarding the Company’s intangible assets:

	December 31, 2018							September 30, 2018
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(In millions)
Intangible assets with finite lives
Developed technologies	$	51	$	(2	)	$	49	$	52	$	(2	)	$	50
Trademarks		8		—			8		8		—			8
Customer relationships		49		(12	)		37		51		(11	)		40
Total intangible assets	$	108	$	(14	)	$	94	$	111	$	(13	)	$	98

Intangible assets are amortized over their estimated useful lives, which range between twelve and twenty-five years, with a weighted average amortization period of approximately nineteen years. Amortization expense for the three month periods ended December 31, 2018 and 2017 was $1 million and $2 million, respectively, and is included in Cost of sales and Selling and administrative expenses in the Consolidated Statements of Operations. Total amortization expense is estimated to be approximately $6 million each year for the next five fiscal years.

F. Accumulated Other Comprehensive Income (Loss)

Comprehensive income combines net income (loss) and other comprehensive income items, which are reported as components of stockholders’ equity in the accompanying Consolidated Balance Sheets.

Changes in each component of AOCI, net of tax, were as follows:

	Currency Translation Adjustment			Unrealized Gains on Investments		Pension and Other Postretirement Benefit Liability Adjustments			Total
	(In millions)
Balance at September 30, 2018, attributable to Cabot Corporation	$	(266	)	$	1	$	(52	)	$	(317	)
Other comprehensive income (loss) before reclassifications		(24	)		—		30			6
Amounts reclassified from AOCI		(1	)		—		(8	)		(9	)
Less: Other comprehensive income (loss) attributable to noncontrolling interests		—			—		—			—
Balance at December 31, 2018, attributable to Cabot Corporation	$	(291	)	$	1	$	(30	)	$	(320	)

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The amounts reclassified out of AOCI and into the Consolidated Statements of Operations in the three months ended December 31, 2018 and 2017 were as follows:

	Affected Line Item in the Consolidated	Three Months Ended December 31
	Statements of Operations	2018			2017
		(In millions)
Derivatives: net investment hedges
(Gains) losses reclassified to interest expense	Interest expense	$	(1	)	$	(1	)
Pension and other postretirement benefit liability adjustment
Amortization of actuarial losses	Net Periodic Benefit Cost—see Note D for details		1			1
Amortization of prior service credit	Net Periodic Benefit Cost—see Note D for details		—			(1	)
Settlement and curtailment gain	Net Periodic Benefit Cost—see Note D for details		(6	)		—
Total before tax			(6	)		(1	)
Tax impact	Provision (benefit) for income taxes		(3	)		—
Total after tax		$	(9	)	$	(1	)

G. Commitments and Contingencies

Purchase Commitments

Cabot has entered into long-term purchase agreements primarily for the purchase of raw materials. Under certain of these agreements, the quantity of material being purchased is fixed, but the price paid changes as market prices change. For these purchase commitments, the amounts included in the table below are based on market prices at December 31, 2018, which may differ from actual market prices at the time of purchase.

	Payments Due by Fiscal Year
	Remainder of Fiscal 2019		2020		2021		2022		2023		Thereafter		Total
	(In millions)
Reinforcement Materials	$	263	$	248	$	141	$	137	$	130	$	1,703	$	2,622
Performance Chemicals		73		59		55		55		32		454		728
Purification Solutions		6		6		1		—		—		—		13
Specialty Fluids		15		—		—		—		—		—		15
Total	$	357	$	313	$	197	$	192	$	162	$	2,157	$	3,378

Guarantee Agreements

Cabot has provided certain indemnities pursuant to which it may be required to make payments to an indemnified party in connection with certain transactions and agreements. In connection with certain acquisitions and divestitures, Cabot has provided routine indemnities with respect to such matters as environmental, tax, insurance, product and employee liabilities. In connection with various other agreements, including service and supply agreements with customers, Cabot has provided indemnities for certain contingencies and routine warranties. Cabot is unable to estimate the maximum potential liability for these types of indemnities as a maximum obligation is not explicitly stated in most cases and the amounts, if any, are dependent upon the outcome of future contingent events, the nature and likelihood of which cannot be reasonably estimated. The duration of the indemnities vary, and in many cases are indefinite. Cabot has not recorded any liability for these indemnities in the consolidated financial statements, except as otherwise disclosed.

Contingencies

Cabot is a defendant, or potentially responsible party, in various lawsuits and environmental proceedings wherein substantial amounts are claimed or at issue.

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Environmental Matters

As of December 31, 2018 and September 30, 2018, Cabot had $14 million and $15 million, respectively, reserved for environmental matters. These environmental matters mainly relate to former operations. The Company’s reserves for environmental matters represent Cabot’s best estimates of the probable costs to be incurred at those sites where costs are reasonably estimable based on the Company’s analysis of the extent of clean up required, alternative clean-up methods available, abilities of other responsible parties to contribute and its interpretation of laws and regulations applicable to each site.

Cash payments related to these environmental matters were $1 million and less than $1 million in the first three months of fiscal 2019 and fiscal 2018, respectively. Cabot reviews the adequacy of the reserves as circumstances change at individual sites and adjusts the reserves as appropriate. Almost all of Cabot’s environmental issues relate to sites that are mature and have been investigated and studied and, in many cases, are subject to agreed upon remediation plans. However, depending on the results of future testing, changes in risk assessment practices, remediation techniques and regulatory requirements, newly discovered conditions, and other factors, it is reasonably possible that the Company could incur additional costs in excess of environmental reserves currently recorded. Management estimates, based on the latest available information, that any such future environmental remediation costs that are reasonably possible to be in excess of amounts already recorded would be immaterial to the Company’s consolidated financial statements.

Respirator Liabilities

Cabot has exposure in connection with a safety respiratory products business that a subsidiary acquired from American Optical Corporation (“AO”) in an April 1990 asset purchase transaction. The subsidiary manufactured respirators under the AO brand and disposed of that business in July 1995. In connection with its acquisition of the business, the subsidiary agreed, in certain circumstances, to assume a portion of AO’s liabilities, including costs of legal fees together with amounts paid in settlements and judgments, allocable to AO respiratory products used prior to the 1990 purchase by the Cabot subsidiary. In exchange for the subsidiary’s assumption of certain of AO’s respirator liabilities, AO agreed to provide to the subsidiary the benefits of: (i) AO’s insurance coverage for the period prior to the 1990 acquisition and (ii) a former owner’s indemnity of AO holding it harmless from any liability allocable to AO respiratory products used prior to May 1982. As more fully described in the 2018 10-K, the respirator liabilities generally involve claims for personal injury, including asbestosis, silicosis and coal worker’s pneumoconiosis, allegedly resulting from the use of respirators that are alleged to have been negligently designed and/or labeled. Neither Cabot, nor its past or present subsidiaries, at any time manufactured asbestos or asbestos-containing products. At no time did this respiratory product line represent a significant portion of the respirator market.

As of both December 31, 2018 and September 30, 2018, there were approximately 35,000 claimants in pending cases asserting claims against AO in connection with respiratory products. Cabot has a reserve to cover its expected share of liability for existing and future respirator liability claims. At December 31, 2018 and September 30, 2018, the reserve was $24 million and $25 million, respectively. The Company made payments related to its respirator liability of $1 million and less than $1 million in the first three months of fiscal 2019 and fiscal 2018, respectively.

The Company’s current estimate of the cost of its share of existing and future respirator liability claims is based on facts and circumstances existing at this time. Developments that could affect the Company’s estimate include, but are not limited to, (i) significant changes in the number of future claims, (ii) changes in the rate of dismissals without payment of pending claims, (iii) significant changes in the average cost of resolving claims, (iv) significant changes in the legal costs of defending these claims, (v) changes in the nature of claims received, (vi) trial and appellate outcomes, (vii) changes in the law and procedure applicable to these claims, (viii) the financial viability of other parties that contribute to the settlement of respirator claims, (ix) a change in the availability of insurance coverage maintained by certain of the other parties that contribute to the settlement of respirator claims, or the indemnity provided by a former owner of the business, (x) changes in the allocation of costs among the various parties paying legal and settlement costs, and (xi) a determination that the assumptions that were used to estimate Cabot’s share of liability are no longer reasonable. The Company cannot determine the impact of these potential developments on its current estimate of its share of liability for existing and future claims. Accordingly, the actual amount of these liabilities for existing and future claims could be larger than the reserved amount.

Other Matters

The Company has various other lawsuits, claims and contingent liabilities arising in the ordinary course of its business and with respect to its divested businesses. The Company does not believe that any of these matters will have a material adverse effect on its financial position; however, litigation is inherently unpredictable. Cabot could incur judgments, enter into settlements or revise its expectations regarding the outcome of certain matters, and such developments could have a material impact on its results of operations in the period in which the amounts are accrued or its cash flows in the period in which the amounts are paid.

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H. Income Tax

Effective Tax Rate

	Three Months Ended December 31
	2018			2017
	(Dollars in millions)
(Provision) benefit for income taxes	$	7		$	(205	)
Effective tax rate		(10	)%		224	%

For the three months ended December 31, 2018, the tax (provision) benefit included a net discrete tax benefit of $24 million, of which $17 million comprised the impact of the Act. For the three months ended December 31, 2017, the tax provision included net discrete tax expense of $188 million, of which $185 million comprised the impact of the enactment of the Act.

Tax Reform

On December 22, 2017, the U.S. enacted significant changes to federal income tax law affecting the Company, including a permanent reduction of the U.S. corporate income tax rate from 35% to 21%, effective January 1, 2018, as well as a 100% dividend received deduction for foreign dividends. Although the passage of the Act reduced the U.S. tax rate and effectively created a participation exemption regime for foreign earnings, certain other aspects of the new legislation, including in particular, immediate U.S. taxation of global intangible low-taxed income (“GILTI”) earned by foreign subsidiaries, will have a negative impact on earnings. In transitioning to this participation exemption regime, Cabot was also subject, during fiscal 2018, to a one-time tax on the deemed repatriation of certain foreign earnings. A discussion of key relevant provisions of the Act and the Company’s assessment of the impact of such provisions on its consolidated financial statements is set forth below.

Uncertain Impacts of the Act

The accounting standard for income taxes (“ASC 740”) required the Company to recognize the effect of the tax law changes under the Act in the first quarter of fiscal 2018. However, due to the potential uncertainty or diversity of views in accounting for the impact of the Act, the Securities and Exchange Commission staff issued Staff Accounting Bulletin 118 (“SAB 118”) to address the application of U.S. GAAP in situations where a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Act.

In particular, SAB 118 clarified that the impact of the Act must be accounted for and reported in one of three ways: (1) by reflecting the tax effects of the Act for which the accounting is complete; (2) by reporting provisional amounts for those specific income tax effects of the Act for which the accounting is incomplete but a reasonable estimate can be determined, with such provisional amounts (or adjustments to provisional amounts) identified in the measurement period, as defined therein, being included as an adjustment to tax expense or benefit from continuing operations in the period the amounts are determined; or (3) where the income tax effects cannot be reasonably estimated, no provisional amounts should be reported and the registrant should continue to apply ASC 740 based on the provisions of the tax laws that were in effect immediately prior to the enactment of the Act. The measurement period begins in the reporting period that includes the Act’s enactment date and ends when the accounting has been completed, but not beyond one year from the enactment date.

As provided in SAB 118, final adjustments have been made to the provisional amounts recorded during fiscal 2018 and the Company has now completed its accounting for various tax impacts of the Act:

• Revaluation of Deferred Tax Assets: Due to the Company’s September 30 fiscal year-end, the reduction in the corporate tax rate to 21% effective January 1, 2018 applied on a pro-rata basis for fiscal 2018, resulting in a U.S. federal statutory tax rate of 24.53% for fiscal 2018. As of September 30, 2018, the accounting for this item was complete; no further adjustment has been made to this amount during the three months ended December 31, 2018.

• Deemed Repatriation: In general, the Act provides that U.S. shareholders of a “specified foreign corporation”, as defined in the Act, must include in U.S. taxable income its pro-rata share of certain undistributed and previously untaxed post-1986 foreign earnings and profits (“E&P”). The amount of E&P taken into account is the amount determined either as of November 2, 2017 or December 31, 2017, whichever is greater. This inclusion is offset by a deduction that results in an effective U.S. federal income tax rate of either 15.5% or 8%. The 15.5% rate applies to the “aggregate cash position”, as defined in the Act, of the specified foreign corporations and the 8% rate applies to the extent that the income inclusion exceeds the aggregate cash position. The aggregate cash position is determined as the cash position either as of September 30, 2018, or the average of September 30, 2016 and September 30, 2017, whichever is greater. Finally, the U.S. cash tax impact of the deemed repatriation inclusion may be offset by the utilization of foreign tax credits, which are pro-rated to reflect the deduction described above.

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As of December 31, 2018, the accounting for this item is complete. For the three months ended December 31, 2018, the Company recorded an additional provisional tax benefit of $17 million related to the U.S. taxation of deemed foreign dividends in the transition fiscal year. This benefit may be reduced or eliminated in future legislation. If such legislation is enacted, Cabot will record the impact of the legislation in the quarter of enactment. Including the provisional tax expense of $138 million recorded for deemed repatriation during fiscal 2018, the total tax expense for this item was $121 million.

• Deferred Tax Liability on Unremitted Earnings: In addition to the deemed repatriation of foreign earnings, going forward, the Act effectively establishes a participation exemption system of taxation that, in general, provides a 100% deduction for dividends from specified foreign corporations. However, the Company is still required to provide non-U.S. withholding taxes, as well as other potential tax impacts, on undistributed earnings of non-U.S. subsidiaries that it does not consider to be indefinitely reinvested.

As of December 31, 2018, the accounting for this item is complete. For the three months ended December 31, 2018, the Company did not make any further adjustments to the provisional tax expense of $8 million recorded for deferred tax liability on unremitted earnings during fiscal 2018.

Accounting for the Global Intangible Low-Taxed Income Tax

Under the Act, Cabot is subject to a tax on GILTI beginning in fiscal 2019. In general, GILTI is a 10.5% tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The Company has adopted an accounting policy to recognize these temporary differences as period costs if and when incurred.

Uncertainties

Cabot and certain subsidiaries are under audit in a number of jurisdictions. In addition, certain statutes of limitations are scheduled to expire in the near future. It is reasonably possible that a further change in the unrecognized tax benefits may also occur within the next twelve months related to the settlement of one or more of these audits or the lapse of applicable statutes of limitations. However, an estimated range of the impact on the unrecognized tax benefits cannot be quantified at this time.

Cabot files U.S. federal and state and non-U.S. income tax returns in jurisdictions with varying statutes of limitations. The 2014 through 2017 tax years generally remain subject to examination by the IRS and various tax years from 2005 through 2017 remain subject to examination by the respective state tax authorities. In significant non-U.S. jurisdictions, various tax years from 2002 through 2017 remain subject to examination by their respective tax authorities. As of December 31, 2018, Cabot’s significant non-U.S. jurisdictions include Canada, China, France, Germany, Italy, Japan, and the Netherlands.

During the three months ended December 31, 2018, Cabot released uncertain tax positions of $7 million due to audit settlements and the expiration of statutes of limitations in various jurisdictions. During the three months ended December 31, 2017, Cabot released uncertain tax positions of $1 million due to the expirations of statutes of limitations in various jurisdictions.

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I. Earnings Per Share

The following tables summarize the components of the basic and diluted earnings (loss) per common share (“EPS”) computations:

	Three Months Ended December 31
	2018		2017
	(In millions, except per share amounts)
Basic EPS:
Net income (loss) attributable to Cabot Corporation	$	69	$	(122	)
Less: Undistributed earnings allocated to participating securities(1)		—		—
Earnings (loss) allocated to common shareholders (numerator)	$	69	$	(122	)
Weighted average common shares and participating securities outstanding		60.8		62.6
Less: Participating securities(1)		0.9		0.7
Adjusted weighted average common shares (denominator)		59.9		61.9
Earnings (loss) per common share—basic:	$	1.14	$	(1.98	)
Diluted EPS:
Earnings (loss) allocated to common shareholders	$	69	$	(122	)
Plus: Earnings (loss) allocated to participating securities		1		—
Less: Adjusted earnings allocated to participating securities(2)		1		—
Earnings (loss) allocated to common shareholders (numerator)	$	69	$	(122	)
Adjusted weighted average common shares outstanding		59.9		61.9
Effect of dilutive securities:
Common shares issuable(3)		0.2		—
Adjusted weighted average common shares (denominator)		60.1		61.9
Earnings (loss) per common share—diluted:	$	1.14	$	(1.98	)

⁽¹⁾ Participating securities consist of shares underlying outstanding and achieved performance-based restricted stock units issued during and after fiscal 2017 and all unvested time-based restricted stock units.

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Undistributed earnings are the earnings which remain after dividends declared during the period are assumed to be distributed to the common and participating shareholders. Undistributed earnings are allocated to common and participating shareholders on the same basis as dividend distributions. The calculation of undistributed earnings is as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Calculation of undistributed earnings (loss):
Net income (loss) attributable to Cabot Corporation	$	69	$	(122	)
Less: Dividends declared on common stock		20		20
Undistributed earnings (loss)	$	49	$	(142	)
Allocation of undistributed earnings (loss):
Undistributed earnings (loss) allocated to common shareholders	$	49	$	(142	)
Undistributed earnings (loss)	$	49	$	(142	)

⁽²⁾  Undistributed earnings are adjusted for the assumed distribution of dividends to the dilutive securities, which are described in (3) below, and then reallocated to participating securities.

⁽³⁾  Represents incremental shares of common stock from the (i) assumed exercise of stock options issued under Cabot’s equity incentive plans; (ii) assumed issuance of shares to employees pursuant to the Company’s Deferred Compensation and Supplemental Retirement Plan; and (iii) assumed issuance of shares for outstanding and achieved performance-based restricted stock unit awards issued before fiscal 2017 under Cabot’s equity incentive plans using the treasury stock method. For the three months ended December 31, 2018, 687,995 incremental shares of common stock were excluded from the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive. For the three months ended December 31, 2017, 764,077 incremental shares of common stock were excluded from the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive.

J. Restructuring

Cabot’s restructuring activities were recorded in the Consolidated Statements of Operations in the three months ended December 31, 2018 and 2017 as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Cost of sales	$	3	$	1
Selling and administrative expenses		6		—
Total	$	9	$	1

Details of all restructuring activities and the related reserves during the three months ended December 31, 2018 were as follows:

	Severance and Employee Benefits			Environmental Remediation		Asset Impairment and Accelerated Depreciation			Other			Total
	(In millions)
Reserve at September 30, 2018	$	1		$	4	$	—		$	—		$	5
Charges		7			—		1			1			9
Costs charged against assets / (liabilities)		—			1		(1	)		—			—
Cash received (paid)		(1	)		—		—			(1	)		(2	)
Reserve at December 31, 2018	$	7		$	5	$	—		$	—		$	12

Cabot’s severance and employee benefit reserves and other closure related reserves are reflected in Accounts payable and accrued liabilities on the Company’s Consolidated Balance Sheets. Cabot’s environmental remediation reserves related to restructuring activities are reflected in Other liabilities on the Company’s Consolidated Balance Sheets.

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Purification Solutions Transformation Plan

In December 2018, the Company began implementation, subject to local consultation requirements, of a transformation plan to improve the long-term performance of the Purification Solutions segment. The purpose of the plan is to focus the business’s product portfolio, optimize its manufacturing assets, and streamline its organizational structure to support the new focus. The plan includes a proposed workforce restructuring, which is subject to local consultation requirements. The Company recorded charges of approximately $8 million related to this plan in the three months ended December 31, 2018, comprised of approximately $7 million of severance costs and $1 million of professional fees. Cabot paid approximately $1 million related to these activities in the three months ended December 31, 2018 and expects to pay approximately $7 million in the remainder of fiscal 2019 and thereafter, subject to the results of the consultation processes in certain locations. As of December 31, 2018, Cabot had $7 million of accrued severance charges in the Consolidated Balance Sheets related to these actions.

Marshall, Texas Plan

In October 2017, Cabot indefinitely idled three of the seven production units at its activated carbon manufacturing facility in Marshall, Texas. Total costs recorded related to this plan, which was completed in fiscal 2018, were $1 million, comprised of approximately $1 million of non-cash accelerated depreciation costs and less than $1 million of severance costs.

2016 Plan

In October 2015, in response to challenging macroeconomic conditions, the Company announced its intention to restructure its operations subject to local consultation requirements and processes in certain locations.

Most of the charges and cash outlays related to this plan were recorded in fiscal 2016. The Company recorded pre-tax cash charges related to this plan of less than $1 million in the first three months of both fiscal 2019 and 2018. No further charges are expected related to this plan.

Other Actions

Cabot recorded approximately $1 million of severance charges in the first quarter of fiscal 2019, of which less than $1 million was paid during the quarter. The balance is expected to be paid during the remainder of fiscal 2019. Additionally, Cabot recorded less than $1 million of accelerated depreciation charges in the first quarter of fiscal 2019 and expects to record approximately $1 million of additional accelerated depreciation in the remainder of fiscal 2019 and approximately $1 million thereafter.

Cabot recorded less than $1 million of severance charges in the first quarter of fiscal 2018, nearly all of which was paid in that quarter.

Additionally, in previous years, the Company entered into other various restructuring actions that have been substantially completed. As of December 31, 2018, Cabot had approximately $5 million of accrued environmental and closure costs in the Consolidated Balance Sheets related to these actions which it expects to pay in the remainder of fiscal 2019 and thereafter.

K. Financial Instruments and Fair Value Measurements

The FASB authoritative guidance on fair value measurements defines fair value, provides a framework for measuring fair value, and requires certain disclosures about fair value measurements. The required disclosures focus on the inputs used to measure fair value. The guidance establishes the following hierarchy for categorizing these inputs:

Level 1	—	Quoted market prices in active markets for identical assets or liabilities
Level 2	—	Significant other observable inputs (e.g., quoted prices for similar items in active markets, quoted prices for identical or similar items in markets that are not active, inputs other than quoted prices that are observable such as interest rate and yield curves, and market-corroborated inputs)
Level 3	—	Significant unobservable inputs

There were no transfers of financial assets or liabilities measured at fair value between Level 1 and Level 2 and there were no Level 3 investments during the first three months of either fiscal 2019 or 2018.

At December 31, 2018 and September 30, 2018, Cabot had derivatives relating to foreign currency risks carried at fair value. At December 31, 2018 and September 30, 2018, the fair value of these derivatives was a net liability of $10 million and $18 million, respectively, and was included in Prepaid expenses and other current assets and Other liabilities on the Consolidated Balance Sheets. These derivatives are classified as Level 2 instruments within the fair value hierarchy as the fair value determination was based on observable inputs.

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At both December 31, 2018 and September 30, 2018, the fair value of guaranteed investment contracts, included in Other assets on the Consolidated Balance Sheets, was $11 million. Guaranteed investment contracts were classified as Level 2 instruments within the fair value hierarchy as the fair value determination was based on other observable inputs.

At December 31, 2018 and September 30, 2018, the fair values of cash and cash equivalents, accounts and notes receivable, accounts payable and accrued liabilities, and short-term borrowings and variable rate debt approximated their carrying values due to the short-term nature of these instruments. The carrying value and fair value of the long-term fixed rate debt were $669 million and $681 million, respectively, as of December 31, 2018, and $747 million and $742 million, respectively, as of September 30, 2018. The fair values of Cabot’s fixed rate long-term debt are estimated based on comparable quoted market prices at the respective period ends. The carrying amounts of Cabot’s floating rate long-term debt and capital lease obligations approximate their fair values. All such measurements are based on observable inputs and are classified as Level 2 within the fair value hierarchy. The valuation technique used is the discounted cash flow model.

L. Derivatives

Foreign Currency Risk Management

Cabot’s international operations are subject to certain risks, including currency exchange rate fluctuations and government actions. Cabot endeavors to match the currency in which debt is issued to the currency of the Company’s major, stable cash receipts. In some situations, Cabot has issued debt denominated in U.S. dollars and then entered into cross-currency swaps that exchange the dollar principal and interest payments into Euro-denominated principal and interest payments.

Additionally, the Company has foreign currency exposure arising from its net investments in foreign operations. Cabot may enter into cross-currency swaps to mitigate the impact of currency rate changes on the Company’s net investments.

The Company also has foreign currency exposure arising from the denomination of monetary assets and liabilities in foreign currencies other than the functional currency of a given subsidiary as well as the risk that currency fluctuations could affect the dollar value of future cash flows generated in foreign currencies. Accordingly, Cabot uses short-term forward contracts to minimize the exposure to foreign currency risk. In certain situations where the Company has forecasted purchases under a long-term commitment or forecasted sales denominated in a foreign currency, Cabot may enter into appropriate financial instruments in accordance with the Company’s risk management policy to hedge future cash flow exposures.

The following table provides details of the derivatives held as of December 31, 2018 and September 30, 2018 to manage foreign currency risk.

		Notional Amount
Description	Borrowing	December 31, 2018	September 30, 2018	Hedge Designation
Cross-Currency Swaps	3.4% Notes	USD 250 million swapped to EUR 223 million	USD 250 million swapped to EUR 223 million	Net investment
Forward Foreign Currency Contracts (1)	N/A	USD 14 million	USD 18 million	No designation

⁽¹⁾  Cabot’s forward foreign exchange contracts are denominated in the Canadian dollar, Indonesian rupiah and Czech koruna.

Accounting for Derivative Instruments and Hedging Activities

The Company determines the fair value of financial instruments using quoted market prices whenever available. When quoted market prices are not available for various types of financial instruments (such as forwards, options and swaps), the Company uses standard models with market-based inputs, which take into account the present value of estimated future cash flows and the ability of Cabot or the financial counterparty to perform. For interest rate and cross-currency swaps, the significant inputs to these models are interest rate curves for discounting future cash flows and are adjusted for credit risk. For forward foreign currency contracts, the significant inputs are interest rate curves for discounting future cash flows, and exchange rate curves of the foreign currency for translating future cash flows.

Fair Value Hedge

For derivative instruments that are designated and qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting gain or loss on the hedged item attributable to the hedged risk are recognized in current period earnings.

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Cash Flow Hedge

For derivative instruments that are designated and qualify as cash flow hedges, the effective portion of the gain or loss on the derivative is recorded in AOCI and reclassified to earnings in the same period or periods during which the hedged transaction affects earnings. Gains and losses on the derivative representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness are recognized in current period earnings.

Net Investment Hedge

For net investment hedges, changes in the fair value of the effective portion of the derivatives’ gains or losses are reported as foreign currency translation gains or losses in AOCI while changes in the ineffective portion are reported in earnings. Effectiveness is assessed using the method based on changes in spot exchange rates. The gains or losses on derivative instruments reported in AOCI are reclassified to earnings in the period in which earnings are affected by the underlying item, such as a disposal or substantial liquidations of the entities being hedged.

The Company has cross-currency swaps with a notional amount of $250 million, which are designated as hedges of its net investments in certain Euro-denominated subsidiaries. Cash settlements occur semi-annually on March 15^th and September 15^th for fixed rate interest payments and a cash exchange of the notional currency amount will occur at the end of the term in 2026. As of December 31, 2018, the fair value of these swaps was a net liability of $10 million and was included in Prepaid expenses and other current assets and Other liabilities and the cumulative loss of $7 million was included in AOCI on the Consolidated Balance Sheets. As of September 30, 2018, the fair value of these swaps was a net liability of $18 million and was included in Prepaid expenses and other current assets and Other Liabilities and the cumulative loss of $14 million was included in AOCI on the Consolidated Balance Sheets.

The following tables summarize the impact of the cross-currency swaps to AOCI and the Consolidated Statements of Operations:

	Three Months Ended December 31
	2018		2017			2018			2017			2018		2017
Description	Gain/(Loss) Recognized in AOCI					(Gain)/Loss Reclassified from AOCI into Interest Expense in the Consolidated Statements of Operations						(Gain)/Loss Recognized in Interest Expense in the Consolidated Statements of Operations (Amount Excluded from Effectiveness Testing)
	(In millions)
Cross-currency swaps	$	8	$	(5	)	$	(1	)	$	(1	)	$	—	$	—

Other Derivative Instruments

From time to time, the Company may enter into certain derivative instruments that may not be designated as hedges for accounting purposes, which may include cross-currency swaps, foreign currency forward contracts and commodity derivatives. For cross-currency swaps and foreign currency forward contracts not designated as hedges, the Company uses standard models with market-based inputs. The significant inputs to these models are interest rate curves for discounting future cash flows, and exchange rate curves of the foreign currency for translating future cash flows. In determining the fair value of the commodity derivatives, the significant inputs to valuation models are quoted market prices of similar instruments in active markets. Although these derivatives do not qualify for hedge accounting, Cabot believes that such instruments are closely correlated with the underlying exposure, thus managing the associated risk. The gains or losses from changes in the fair value of derivative instruments that are not accounted for as hedges are recognized in current period earnings.

At December 31, 2018, the fair value of derivative instruments not designated as hedges were immaterial and were presented in Accounts payable and accrued liabilities, and Prepaid expenses and other current assets on the Consolidated Balance Sheets. At September 30, 2018 the fair value of derivative instruments not designated as hedges were immaterial and were presented in Accounts payable and accrued liabilities on the Consolidated Balance Sheets.

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M. Hyperinflationary Economies

Argentina

Cabot owns 100% of a carbon black operating entity in Argentina. Effective July 1, 2018, the operating entity was considered to be functioning in a highly inflationary economy and began using Cabot’s reporting currency, the U.S. dollar, as its functional currency. Since the conversion, all impacts of foreign exchange changes between the reporting currency and Argentine peso are reflected in earnings in the Consolidated Statements of Operations.

The Company’s income from operations has not been significantly impacted from this change because the operating entity’s sales and a portion of its raw material purchases were already denominated in U.S. dollars. The operating entity’s net revenue represented approximately 2% of Cabot’s total net revenue for the three months ended December 31, 2018.

The operating entity’s assets and liabilities held in local currency, which consist primarily of cash and cash equivalents, inventories, property, plant and equipment and accounts payable and accrued liabilities, made up less than 2% of Cabot’s total assets and total liabilities as of both December 31, 2018 and September 30, 2018. Changes in the Argentine peso exchange rate will result in foreign currency exchange gains or losses on the operating entity’s peso-denominated monetary assets and liabilities. The Company recorded a $1 million net loss within Other (income) expense in the Consolidated Statements of Operations for the three months ended December 31, 2018, which reflects the remeasurement of the operating entity’s net monetary liabilities denominated in Argentine peso using an exchange rate of 37.70 Argentine peso to the U.S. dollar at December 31, 2018.

The Company will continue to monitor the developments in Argentina and their potential impact on the operating entity’s operations or carrying value.

Venezuela

Cabot owns 49% of a carbon black operating affiliate in Venezuela, which is accounted for as an equity affiliate, through wholly-owned subsidiaries that carry the investment and receive its dividends. As of December 31, 2018, these subsidiaries carried the operating affiliate investment of $12 million.

During the three months ended December 31, 2018 and 2017, the Company received dividends in the amounts of $1 million and $2 million, respectively, which were paid in U.S. dollars.

A significant portion of the Company’s operating affiliate’s sales are exports denominated in U.S. dollars. The Venezuelan government mandates that a certain percentage of the dollars collected from these sales be converted into bolivars. The exchange rate made available to the Company as of December 31, 2018 and September 30, 2018 was 564 and 62 bolivars soberano to the U.S. dollar, respectively. Due to a reduced level of export sales in recent periods, the exchange rate devaluation during the first three months of fiscal 2019 had an immaterial impact on the Company’s results.

While the operating entity has historically been profitable, it has not been operational in recent months due to a lack of available raw materials. The Company continues to closely monitor developments in Venezuela and their potential impact on the recoverability of its equity affiliate investment. Any future change in the exchange rate made available to the Company could cause the Company to change the exchange rate it uses and result in gains or losses on the bolivar-denominated assets held by its operating affiliate.

N. Financial Information by Segment

The Company identifies a business as an operating segment if: (i) it engages in business activities from which it may earn revenues and incur expenses; (ii) its operating results are regularly reviewed by the Chief Operating Decision Maker (“CODM”), who is Cabot’s President and Chief Executive Officer, to make decisions about resources to be allocated to the segment and assess its performance; and (iii) it has available discrete financial information. The Company has determined that all of its businesses are operating segments. The CODM reviews financial information at the operating segment level to allocate resources and to assess the operating results and financial performance for each operating segment. Operating segments are aggregated into a reportable segment if the operating segments are determined to have similar economic characteristics and if the operating segments are similar in the following areas: (i) nature of products and services; (ii) nature of production processes; (iii) type or class of customer for their products and services; (iv) methods used to distribute the products or provide services; and (v) if applicable, the nature of the regulatory environment.

The Company has four reportable segments: Reinforcement Materials, Performance Chemicals, Purification Solutions and Specialty Fluids.

The Reinforcement Materials segment represents the rubber blacks and elastomer composites product lines.

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The Performance Chemicals segment combines the specialty carbons, fumed metal oxides and aerogel product lines into the Performance Additives business, and combines the specialty compounds and inkjet colorants product lines into the Formulated Solutions business. These businesses are similar in terms of economic characteristics, nature of products, processes, customer class and product distribution methods, and, therefore, have been aggregated into one reportable segment. The net sales from each of these businesses for the three months ended December 31, 2018 and 2017 were as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Performance Additives	$	167	$	159
Formulated Solutions		64		70
Performance Chemicals	$	231	$	229

The Purification Solutions segment represents the Company’s activated carbon business and the Specialty Fluids segment includes cesium formate oil and gas drilling fluids and high-purity fine cesium chemicals product lines.

Income (loss) from continuing operations before income taxes (“Segment EBIT”) is presented for each reportable segment in the table below. Segment EBIT excludes certain items, meaning items management does not consider representative of on-going operating segment results. In addition, Segment EBIT includes Equity in earnings of affiliated companies, net of tax, the full operating results of a contractual joint venture in Purification Solutions, royalties, Net income attributable to noncontrolling interests, net of tax, and discounting charges for certain Notes receivable, but excludes Interest expense, foreign currency transaction gains and losses, interest income, dividend income, unearned revenue, general unallocated expense and unallocated corporate costs.

Financial information by reportable segment is as follows:

	Reinforcement Materials		Performance Chemicals		Purification Solutions			Specialty Fluids			Segment Total		Unallocated and Other(1)			Consolidated Total
	(In millions)
Three Months Ended December 31, 2018
Revenues from external customers(2)	$	457	$	231	$	65		$	19		$	772	$	49		$	821
Income (loss) from continuing operations before income taxes(3)	$	62	$	36	$	(3	)	$	10		$	105	$	(35	)	$	70
Three Months Ended December 31, 2017
Revenues from external customers(2)	$	387	$	229	$	70		$	6		$	692	$	28		$	720
Income (loss) from continuing operations before income taxes(3)	$	62	$	47	$	6		$	(2	)	$	113	$	(21	)	$	92

⁽¹⁾  Unallocated and Other includes certain items and eliminations necessary to reflect management’s reporting of operating segment results. These items are reflective of the segment reporting presented to the CODM.

⁽²⁾  Consolidated Total Revenues from external customers reconciles to Net sales and other operating revenues on the Consolidated Statements of Operations. Revenues from external customers that are categorized as Unallocated and Other reflects royalties, external shipping and handling fees, the impact of unearned revenue, the removal of 100% of the sales of an equity method affiliate, discounting charges for certain Notes receivable, and by-product revenue. Details are provided in the table below:

	Three Months Ended December 31
	2018			2017
	(In millions)
Royalties, the impact of unearned revenue, the removal of 100% of the sales of an equity method affiliate and discounting charges for certain notes receivable	$	(3	)	$	1
Shipping and handling fees		32			27
By-product sales(a)		20			—
Total	$	49		$	28

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^(a)  Beginning in fiscal 2019 as part of the adoption of the new accounting standard, Revenue from Contracts with Customers, the Company includes revenue from by-products produced in manufacturing operations in Net sales and other operating revenues, which in prior years was included as a reduction in Cost of sales.

⁽³⁾  Consolidated Total Income (loss) from continuing operations before income taxes reconciles to Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies on the Consolidated Statements of Operations. Income (loss) from continuing operations before income taxes that are categorized as Unallocated and Other includes:

	Three Months Ended December 31
	2018			2017
	(In millions)
Interest expense	$	(15	)	$	(13	)
Certain items(a)
Global restructuring activities		(9	)		(1	)
Legal and environmental matters and reserves		—			(1	)
Gains (losses) on sale of investments		—			10
Acquisition and integration-related charges		(3	)		—
Other		2			(1	)
Total certain items, pre-tax		(10	)		7
Unallocated corporate costs(b)		(12	)		(14	)
General unallocated income (expense)(c)		2			—
Less: Equity in earnings of affiliated companies, net of tax(d)		—			1
Total	$	(35	)	$	(21	)

^(a)  Certain items are items of expense and income that management does not consider representative of the Company’s fundamental on-going segment results and they are, therefore, excluded from Segment EBIT.

^(b)  Unallocated corporate costs are costs that are not controlled by the segments and primarily benefit corporate interests.

^(c)  General unallocated income (expense) consists of gains (losses) arising from foreign currency transactions, net of other foreign currency risk management activities, the profit or loss related to the corporate adjustment for unearned revenue, and the impact of including the full operating results of a contractual joint venture in Purification Solutions Segment EBIT.

^(d)  Equity in earnings of affiliated companies, net of tax, is included in Segment EBIT and is removed in Unallocated and other to reconcile to Income (loss) from operations before income taxes and equity in earnings from affiliated companies.

The Company’s segments operate globally. In addition to presenting Revenue from external customers by reportable segment, the following table further disaggregates Revenue from external customers by geographic region.

	Three Months Ended December 31, 2018
	Reinforcement Materials		Performance Chemicals		Purification Solutions		Specialty Fluids		Consolidated Total
	(In millions)
Americas	$	167	$	72	$	29	$	2	$	270
Asia Pacific		202		85		9		1		297
Europe, Middle East and Africa		88		74		27		16		205
Segment revenues from external customers		457		231		65		19		772
Unallocated and other										49
Net sales and other operating revenues									$	821

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O. Subsequent Event

On January 30, 2019, the Company entered into a Stock Purchase Agreement to sell its Specialty Fluids business to Sinomine (Hong Kong) Rare Metals Resources Co. Limited, a wholly owned subsidiary of Sinomine Resource Group Co., Ltd. (“Sinomine”), on a cash-free and debt-free basis in a transaction valued at $135 million. The purchase price consists of $130 million to be paid at closing, subject to customary closing adjustments (including a customary working capital adjustment), and additional cash royalties of up to $5 million for lithium products, payable over a ten-year period.

The transaction is expected to close in the third quarter of fiscal 2019 and is subject to customary closing conditions, including, among other things, the receipt of certain regulatory approvals and notices with respect to the People’s Republic of China and Canada and the consent from the shareholders of Sinomine to the entry into the Agreement and the consummation of the transactions contemplated thereby.

Based on the carrying value of the Specialty Fluids business as of December 31, 2018 and an estimate of the total cash proceeds from the sale, including customary closing adjustments, the Company estimates a non-cash impairment charge of approximately $25 million to be recorded in the second quarter of fiscal 2019 related to the assets held for sale of this business.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Critical Accounting Policies

Our consolidated financial statements have been prepared in conformity with accounting policies generally accepted in the United States (“GAAP”). The preparation of our financial statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues, and expenses and related disclosure of contingent assets and liabilities. We consider an accounting estimate to be critical to the financial statements if (i) the estimate is complex in nature or requires a high degree of judgment and (ii) different estimates and assumptions were used, the results could have a material impact on the consolidated financial statements. On an ongoing basis, we evaluate our estimates and the application of our policies. We base our estimates on historical experience, current conditions and on various other assumptions that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates. Our critical accounting policies have not substantially changed from those described in the 2018 Form 10-K, other than our method for accounting for Revenue Recognition which we changed effective October 1, 2018, as described below.

Revenue Recognition

We recognize revenue when our customers obtain control of promised goods or services. The revenue recognized is the amount of consideration which we expect to receive in exchange for those goods or services. We derive the majority of our revenues from contracts for the sale of products from our Reinforcement Materials, Performance Chemicals and Purification Solutions segments. Our contracts with customers are generally for products only and do not include other performance obligations. Generally, we consider purchase orders, which in some cases are governed by master supply agreements, to be contracts with customers. The transaction price as specified on the purchase order or sales contract is considered the standalone selling price for each distinct product. To determine the transaction price at the time when revenue is recognized, we evaluate whether the price is subject to adjustments, such as for returns, discounts or volume rebates, which are stated in the customer contract, to determine the net consideration to which we expect to be entitled. Revenue from product sales is recognized based on a point in time model when control of the product is transferred to the customer, which typically occurs upon shipment or delivery of the product to the customer and title, risk and rewards of ownership have passed to the customer. Payment terms typically range from zero to ninety days.

Shipping and handling activities that occur after the transfer of control to the customer are billed to customers and are recorded as sales revenue, as we consider these to be fulfillment costs. Shipping and handling costs are expensed in the period incurred and included in Cost of sales within the Consolidated Statement of Operations. Taxes collected on sales to customers are excluded from the transaction price.

We generally provide a warranty that our products will substantially conform to the identified specifications. Our liability typically is limited to either a credit equal to the purchase price or replacement of the non-conforming product. Returns under warranty have historically been immaterial.

Revenue in the Specialty Fluids segment arises primarily from the rental of cesium formate. This revenue is recognized throughout the rental period based on the contracted rental terms. During the three months ended December 31, 2018, we recognized revenue of $8 million related to the rental of cesium formate. Customers are also billed and revenue is recognized, typically at the end of the rental period, for cesium formate product that is not returned. We also generate revenues from cesium formate sold outside of the rental process and from the sale of fine cesium chemicals. This revenue is recognized when control of the product transfers to the customer, which is typically upon delivery of the product.

We do not have contract assets or liabilities that are material.

As permitted by the revenue recognition standard, Revenue from Contracts with Customers, when the period of time between the transfer of control of the goods and the time the customer pays for the goods is one year or less, we do not consider there to be a significant financing component associated with the contract.

Recently Issued Accounting Pronouncements

Refer to the discussion under the headings “Recently Adopted Accounting Standards” and “Recent Accounting Pronouncements” in Note B.

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Results of Operations

Cabot is organized into four reportable business segments: Reinforcement Materials, Performance Chemicals, Purification Solutions and Specialty Fluids. Cabot is also organized for operational purposes into three geographic regions: the Americas; Europe, Middle East and Africa; and Asia Pacific. The discussions of our results of operations for the periods presented reflect these structures. In October 2018, the Company realigned its business reporting structure under the Performance Chemicals segment and now combines the specialty carbons, fumed metal oxides and aerogel product lines into the Performance Additives business, and the specialty compounds and inkjet product lines into the Formulated Solutions business. Prior period Performance Chemicals Segment revenue results have been recast to reflect the realignment.

Our analysis of our financial condition and operating results should be read with our consolidated financial statements and accompanying notes.

Definition of Terms and Non-GAAP Financial Measures

When discussing our results of operations, we use several terms as described below.

The term “product mix” refers to the mix of types and grades of products sold or the mix of geographic regions where products are sold, and the positive or negative impact this has on the revenue or profitability of the business and/or segment.

Our discussion under the heading “(Provision) Benefit for Income Taxes and Reconciliation of Effective Tax Rate to Operating Tax Rate” includes a discussion of our historical and expected “effective tax rate” and our “operating tax rate” and includes a reconciliation of the two rates. Our operating tax rate is a non-GAAP financial measure and should not be considered as an alternative to our effective tax rate, the most comparable GAAP financial measure. In calculating our operating tax rate, we exclude discrete tax items, which include: (i) unusual or infrequent items, such as a significant release or establishment of a valuation allowance, (ii) items related to uncertain tax positions, such as the tax impact of audit settlements, interest on tax reserves, and the release of tax reserves from the expiration of statutes of limitations, and (iii) other discrete tax items, such as the tax impact of legislative changes and, on a quarterly basis, the timing of losses in certain jurisdictions and the cumulative rate adjustment, if applicable. We also exclude the tax impact of certain items, as defined below in the discussion of Total segment EBIT, on both operating income and the tax provision. Our definition of the operating tax rate may not be comparable to the definition used by other companies. Management believes that this non-GAAP financial measure is useful supplemental information because it helps our investors compare our tax rate year to year on a consistent basis and to understand what our tax rate on current operations would be without the impact of these items.

Our discussion under the heading “First Quarter and First Three Months of Fiscal 2019 versus First Quarter and First Three Months of Fiscal 2018—By Business Segment” includes a discussion of Total segment EBIT, which is a non-GAAP financial measure defined as Income (loss) from continuing operations before income taxes and equity in earnings from affiliated companies less certain items and other unallocated items. Our Chief Operating Decision Maker, who is our President and Chief Executive Officer, uses segment EBIT to evaluate the operating results of each segment and to allocate resources to the segments. We believe Total segment EBIT, which reflects the sum of EBIT from our four reportable segments, provides useful supplemental information for our investors as it is an important indicator of our operational strength and performance, allows investors to see our results through the eyes of management, and provides context for our discussion of individual business segment performance. Total segment EBIT should not be considered an alternative for Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies, which is the most directly comparable GAAP financial measure. A reconciliation of Total segment EBIT to Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies is provided under the heading “First Quarter of Fiscal 2019 versus First Quarter of Fiscal 2018—By Business Segment”. Investors should consider the limitations associated with this non-GAAP measure, including the potential lack of comparability of this measure from one company to another.

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In calculating Total segment EBIT, we exclude from our Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies (i) items of expense and income that management does not consider representative of our fundamental on-going segment results, which we refer to as “certain items”, and (ii) items that, because they are not controlled by the business segments and primarily benefit corporate objectives, are not allocated to our business segments, such as interest expense and other corporate costs, which include unallocated corporate overhead expenses such as certain corporate salaries and headquarter expenses, plus costs related to special projects and initiatives, which we refer to as “other unallocated items”. Management believes excluding the items identified as certain items facilitates operating performance comparisons from period to period by eliminating differences caused by the existence and timing of certain expense and income items that would not otherwise be apparent on a GAAP basis and also facilitates an evaluation of our operating performance without the impact of these costs or benefits. The items of income and expense that we have excluded from Total segment EBIT, as applicable, but that are included in our GAAP Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies, as applicable, are described below.

• Asset impairment charges, which primarily include charges associated with an impairment of goodwill or other long-lived assets.

• Inventory reserve adjustment, which resulted from an evaluation performed as part of an impairment analysis.

• Global restructuring activities, which include costs or benefits associated with cost reduction initiatives or plant closures and are primarily related to (i) employee termination costs, (ii) asset impairment charges associated with restructuring actions, (iii) costs to close facilities, including environmental costs and contract termination penalties and (iv) gains realized on the sale of land or equipment associated with restructured plants or locations.

• Acquisition and integration-related charges, which include transaction costs, redundant costs incurred during the period of integration, and costs associated with transitioning certain management and business processes to our processes.

• Legal and environmental reserves and matters, which consist of costs or benefits for matters typically related to former businesses or that are otherwise incurred outside of the ordinary course of business.

• Gains (losses) on sale of investments, which primarily relate to the sale of investments accounted for using the cost method.

• Non-recurring gains (losses) on foreign exchange, which primarily relate to the impact of controlled currency devaluations on our net monetary assets denominated in that currency.

• Executive transition costs, which include incremental charges, including stock compensation charges, associated with the retirement or termination of employment of senior executives of the Company.

Overview

During the first quarter of fiscal 2019, Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies decreased compared to the first quarter of fiscal 2018. Reinforcement Materials business segment results were flat as compared to the first quarter of fiscal 2018. The higher volumes and improved pricing and product mix from 2018 tire customer agreements were offset by the unfavorable impact to margins in China due to softening automotive demand. The Performance Chemicals and Purification Solutions segments both had weaker business segment results during the quarter, which were partially offset by improved results from Specialty Fluids. Performance Chemicals results were driven by challenging short-term dynamics that led to lower volumes and margins and an increase in costs related to growth investments. Purification Solutions results were driven by lower volumes and margins due to ongoing competitive pressure in the mercury removal and other North America powdered activated carbon applications and the impact of royalties received in the first quarter of fiscal 2018 that have since ended. Specialty Fluids results improved as compared to the first quarter of fiscal 2018 due to revenue associated with a higher level of project activity. In addition, results in the quarter were impacted by higher restructuring charges related to the Purification Solutions transformation plan and a gain on the sale of cost method investments recorded in the first quarter of fiscal 2018 that did not reoccur.

First Quarter of Fiscal 2019 versus First Quarter of Fiscal 2018—Consolidated

Net Sales and Other Operating Revenues and Gross Profit

	Three Months Ended December 31
	2018		2017
	(In millions)
Net sales and other operating revenues	$	821	$	720
Gross profit	$	166	$	176

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The $101 million increase in net sales in the first quarter of fiscal 2019 compared to the first quarter of fiscal 2018 was driven by a more favorable price and product mix (combined $88 million) predominantly in Reinforcement Materials, higher volumes in the Specialty Fluids segment ($12 million) and the impact of the change in classification of by-product sales, effective October 1, 2018, from a reduction of Cost of sales to an inclusion in Net sales and other operating revenues ($20 million), partially offset by the unfavorable impact from foreign currency translation ($17 million).

Gross profit decreased by $10 million in the first quarter of fiscal 2019 compared to the first quarter of fiscal 2018, primarily due to lower unit margins in Reinforcement Materials and Performance Chemicals and lower volumes in Performance Chemicals. Lower margins and volumes were caused by challenging short-term dynamics, including softer automotive demand, customer inventory destocking and a weaker environment in China.

Selling and Administrative Expenses

	Three Months Ended December 31
	2018		2017
	(In millions)
Selling and administrative expenses	$	73	$	70

Selling and administrative expenses increased by $3 million in the first quarter of fiscal 2019 compared to the same period of fiscal 2018, primarily due to higher restructuring costs associated with the Purification Solutions transformation plan.

Research and Technical Expenses

	Three Months Ended December 31
	2018		2017
	(In millions)
Research and technical expenses	$	16	$	15

Research and technical expenses increased by $1 million in the first quarter of fiscal 2019 compared to the same period of fiscal 2018, primarily due to higher costs associated with growth projects across the Company.

Interest and Dividend Income, Interest Expense and Other Income (Expense)

	Three Months Ended December 31
	2018			2017
	(In millions)
Interest and dividend income	$	2		$	3
Interest expense	$	(15	)	$	(13	)
Other income (expense)	$	6		$	11

Interest and dividend income decreased by $1 million in the first quarter of fiscal 2019 compared to the same period for fiscal 2018 primarily due to interest earned on lower cash balances.

Interest expense increased by $2 million in the first quarter of fiscal 2019 compared to the same period in fiscal 2018 primarily due to higher commercial paper balances and higher interest rates.

Other income (expense) changed by $5 million in the first quarter of fiscal 2019 compared to the first quarter of fiscal 2018 due to a gain on the sale of cost method investments in the first quarter of fiscal 2018 that did not reoccur in fiscal 2019, partially offset by a pension settlement gain in the first quarter of fiscal 2019 and a favorable comparison in foreign currency movements.

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(Provision) Benefit for Income Taxes and Reconciliation of Effective Tax Rate to Operating Tax Rate

	Three Months Ended December 31
	2018			2017
	(Dollars in millions)
(Provision) benefit for income taxes	$	7		$	(205	)
Effective tax rate		(10	)%		224	%
Impact of discrete tax items(1):
Unusual or infrequent items		29	%		(200	)%
Items related to uncertain tax positions		5	%		(1	)%
Other discrete tax items		1	%		(1	)%
Impact of certain items		(1	)%		(1	)%
Operating tax rate		24	%		21	%

⁽¹⁾ For the three months ended December 31, 2018 and 2017, Impact of discrete tax items included a net discrete tax benefit of $24 million and a net discrete tax expense of $185 million, respectively. The nature of the discrete tax items for the periods ended December 31, 2018 and 2017 were as follows:

^(a) Unusual or infrequent items during the three months ended December 31, 2018 and 2017 consisted of the net tax impacts of the Tax Cuts and Jobs Act of 2017 (the “Act”) (net tax benefit of $17 million and net tax expense $185 million, respectively), excludible foreign exchange gains and losses in certain jurisdictions, impacts related to stock compensation deductions, and the tax impact of a pension settlement (fiscal 2019 only);

^(b) Items related to uncertain tax positions during the three months ended December 31, 2018 and 2017 included net tax impacts from the reversal of accruals for uncertain tax positions due to the expiration of statutes of limitations and the settlement of tax audits, the accrual of interest on uncertain tax positions, and the accrual of prior year uncertain tax positions (fiscal 2018 only); and

^(c) Other discrete tax items during the three months ended December 31, 2018 and 2017 included changes in non-US tax laws as well as various return to provision adjustments related to tax return filings.

For fiscal year 2019, the Effective tax rate and Operating tax rate are expected to be in a range of 17% to 19% and 23% to 25%, respectively. The discrete tax items have the same impact on these ranges. The table provided below reconciles to the mid-point of these ranges.

	Forecast for the Year Ended September 30, 2019
Effective tax rate		18	%
Impact of discrete tax items:
Unusual or infrequent items		5	%
Items related to uncertain tax positions		1	%
Other discrete tax items		—	%
Impact of certain items		—	%
Operating tax rate		24	%

We file U.S. federal and state and non-U.S. income tax returns in jurisdictions with varying statutes of limitations. We are under audit in a number of jurisdictions. It is possible that some of these audits will be resolved in fiscal 2019 and could impact our anticipated effective tax rate. We have filed our tax returns in accordance with the tax laws, in all material respects, in each jurisdiction and maintain tax reserves for uncertain tax positions.

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Tax Reform

On December 22, 2017, the U.S. enacted significant changes to federal income tax law affecting us, including a permanent reduction of the U.S. corporate income tax rate from 35% to 21%, effective January 1, 2018, as well as a 100% dividend received deduction for foreign dividends. Although the passage of the Act reduced the U.S. tax rate and effectively created a participation exemption regime for foreign earnings, certain other aspects of the new legislation, including in particular, immediate U.S. taxation of global intangible low-taxed income (“GILTI”) earned by foreign subsidiaries, will have a negative impact on earnings and this is the primary driver of the increase in the operating tax rate. In transitioning to this participation exemption regime, we were also subject, during our fiscal 2018, to a one-time tax on the deemed repatriation of certain foreign earnings. Refer to the discussion under the heading “Tax Reform” in Note H.

Equity in Earnings of Affiliated Companies and Net Income (Loss) Attributable to Noncontrolling Interests

	Three Months Ended December 31
	2018		2017
	(In millions)
Equity in earnings of affiliated companies, net of tax	$	—	$	1
Net income (loss) attributable to noncontrolling interests, net of tax	$	8	$	10

Equity in earnings of affiliated companies, net of tax, decreased by $1 million in the first quarter of fiscal 2019 compared to the same period of fiscal 2018, primarily due to lower earnings from our Venezuelan equity affiliate.

Net income (loss) attributable to noncontrolling interests, net of tax, decreased by $2 million in the first quarter of fiscal 2019 compared to the same period of fiscal 2018, primarily due to the lower profitability from our joint ventures in China.

Net Income Attributable to Cabot Corporation

In the first quarter of fiscal 2019, we reported net income (loss) attributable to Cabot Corporation of $69 million or $1.14 per diluted common share. This compares to net income (loss) attributable to Cabot Corporation of ($122) million or ($1.98) per diluted common share in the first quarter fiscal 2018. The net loss in fiscal 2018 was due to a tax charge recorded of $185 million in connection with the enactment of the Act.

First Quarter of Fiscal 2019 versus First Quarter of Fiscal 2018—By Business Segment

Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies, certain items, other unallocated items, and Total segment EBIT for the three months ended December 31, 2018 and 2017 are set forth in the table below. The details of certain items and other unallocated items are shown below and in Note N of our Notes to the Consolidated Financial Statements.

	Three Months Ended December 31
	2018			2017
	(In millions)
Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies	$	70		$	92
Less: Certain items		(10	)		7
Less: Other unallocated items		(25	)		(28	)
Total segment EBIT	$	105		$	113

In the first quarter of fiscal 2019, Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies decreased by $22 million when compared to the first quarter of fiscal 2018, which reflects an $8 million decline in Total segment EBIT. Reinforcement Materials segment results were flat as compared to the first quarter of fiscal 2018. The higher volumes and improved pricing and product mix from 2018 tire customer agreements were offset by the unfavorable impact to margins in China due to softening automotive demand. The decline in Total segment EBIT was due to lower unit margins ($7 million) driven by the Purification Solutions segment, higher investments for growth ($7 million) and lower volumes from the Performance Chemicals segment ($4 million), partially offset by higher volumes from the Specialty Fluids segment ($10 million). In addition, the decline in Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies reflects higher restructuring charges related to the Purification Solutions transformation plan ($8 million) and a gain on the sale of cost method investments in the first quarter of fiscal 2018 that did not reoccur ($10 million), partially offset by the decrease in expense related to Other unallocated items ($3 million).

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Certain Items

Details of the certain items for the first quarter of fiscal 2019 and fiscal 2018 are as follows:

	Three Months Ended December 31
	2018			2017
	(In millions)
Global restructuring activities (Note J)	$	(9	)	$	(1	)
Legal and environmental matters and reserves		—			(1	)
Gains (losses) on sale of investments		—			10
Acquisition and integration-related charges (Note C)		(3	)		—
Other		2			(1	)
Total certain items, pre-tax		(10	)		7
Tax-related certain items:
Tax impact of certain items		2			(2	)
Discrete tax items (Note H)		24			(185	)
Total tax-related certain items		26			(187	)
Total certain items, after tax	$	16		$	(180	)

The tax impact of certain items is determined by (1) starting with the current and deferred income tax expense or benefit included in Net income (loss) attributable to Cabot Corporation, and (2) subtracting the tax expense or benefit on “adjusted earnings”. Adjusted earnings is defined as the pre-tax income attributable to Cabot Corporation excluding certain items. The tax expense or benefit on adjusted earnings is calculated by applying the operating tax rate, as defined under the heading “Definition of Terms and Non-GAAP Financial Measures”, to adjusted earnings.

Other Unallocated Items

	Three Months Ended December 31
	2018			2017
	(In millions)
Interest expense	$	(15	)	$	(13	)
Unallocated corporate costs		(12	)		(14	)
General unallocated income (expense)		2			—
Less: Equity in earnings of affiliated companies, net of tax		—			1
Total other unallocated items	$	(25	)	$	(28	)

A discussion of items that we refer to as “other unallocated items” can be found under the heading “Definition of Terms and Non-GAAP Financial Measures”. The balances of unallocated corporate costs are primarily comprised of expenditures related to managing a public company that are not allocated to the segments and corporate business development costs related to ongoing corporate projects. The balances of General unallocated income (expense) consist of gains (losses) arising from foreign currency transactions, net of other foreign currency risk management activities, the profit or loss related to the corporate adjustment for unearned revenue, and the impact of including the full operating results of a contractual joint venture in Purification Solutions segment EBIT.

Total other unallocated items changed by $3 million in the first quarter of fiscal 2019 as compared to the same period in fiscal 2018. Within Total other unallocated items, Unallocated corporate costs decreased by $2 million over the same period of fiscal 2018 primarily due to lower spending on corporate projects.

Reinforcement Materials

Sales and EBIT for Reinforcement Materials for the first quarter of fiscal 2019 and fiscal 2018 were as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Reinforcement Materials Sales	$	457	$	387
Reinforcement Materials EBIT	$	62	$	62

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Sales in Reinforcement Materials increased by $70 million in the first quarter of fiscal 2019 compared to the same period of fiscal 2018, primarily due to a more favorable price and product mix (combined $76 million) and higher volumes ($5 million), partially offset by the unfavorable impact from foreign currency translation ($12 million). The favorable price and product mix impact was primarily due to price and mix improvements from calendar year 2018 customer agreements. Revenues for Reinforcement Materials also include a $2 million technology fee for capacity expansion under the terms of our Technology License Agreement with Manufacture Francaise des Pneumatiques Michelin for the use of our patented elastomer composite manufacturing process.

EBIT in Reinforcement Materials was flat in the first quarter of fiscal 2019 compared to the same period of fiscal 2018. The Reinforcement Materials segment benefitted from higher volumes and improved pricing and product mix from our 2018 customer agreements during the first quarter of fiscal 2019. The benefits in the quarter were offset by lower margins due to softer automotive demand, customer inventory destocking and a weaker environment in China.

Performance Chemicals

Sales and EBIT for Performance Chemicals for the first quarter of fiscal 2019 and fiscal 2018 were as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Performance Additives Sales	$	167	$	159
Formulated Solutions Sales		64		70
Performance Chemicals Sales	$	231	$	229
Performance Chemicals EBIT	$	36	$	47

Sales in Performance Chemicals increased by $2 million in the first quarter of fiscal 2019 compared to the same period of fiscal 2018, primarily due to a more favorable price and product mix (combined $14 million), partially offset by lower volumes ($7 million) and the unfavorable impact from foreign currency translation ($4 million). The favorable price and product mix were primarily due to price increases that were achieved after the first quarter of fiscal 2018 for the Performance Additives business while the decrease in volumes was primarily due to lower volumes from the Performance Additives business.

EBIT in Performance Chemicals decreased by $11 million compared to the first quarter of fiscal 2018 primarily due to lower volumes, lower margins and higher costs related to growth investments. Volumes decreased by 3% in the Performance Additives business and 2% in the Formulated Solutions business. Lower volumes were primarily due to declining raw material costs which led to customer destocking and the softer automotive demand in EMEA and China. Lower margins were largely driven by the impact of high cost specialty carbons inventory that moved through our supply chain during the first quarter. Costs related to growth investments are primarily for two new fumed silica plants that are scheduled to commence operations over the next twelve months.

Purification Solutions

Sales and EBIT for Purification Solutions for the first quarter of fiscal 2019 and fiscal 2018 were as follows:

	Three Months Ended December 31
	2018			2017
	(In millions)
Purification Solutions Sales	$	65		$	70
Purification Solutions EBIT	$	(3	)	$	6

Sales in Purification Solutions decreased by $5 million in the first quarter of fiscal 2019 compared to the same period of fiscal 2018 due to a less favorable price and product mix (combined $3 million), lower volumes ($1 million) and the unfavorable impact from foreign currency translation ($1 million). The less favorable price and product mix was primarily due to the ongoing competitive pressures within the mercury removal application and other North American powdered activated carbon applications.

EBIT in Purification Solutions decreased by $9 million compared to the first quarter of fiscal 2018 largely due to the receipt of $5 million of royalty payments in the first fiscal quarter of 2018 that have since ended, and lower margins resulting from continued competitive intensity in mercury removal and other North American powdered activated carbon applications ($8 million), partially offset by lower costs ($2 million).

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Specialty Fluids

Sales and EBIT for Specialty Fluids for the first quarter of fiscal 2019 and 2018 were as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Specialty Fluids Sales	$	19	$	6
Specialty Fluid EBIT	$	10	$	(2	)

Sales and EBIT in Specialty Fluids increased by $13 million and $12 million, respectively, in the first quarter of fiscal 2019 compared to the same period of fiscal 2018 primarily due to higher project activity.

Outlook

While we expect the first half of the fiscal year to be impacted by challenging short-term dynamics, such as customer inventory destocking and the unfavorable impact from a rapid decline in raw material costs, we anticipate EBIT to improve in both Reinforcement Materials and Performance Chemicals in the second half of our fiscal year. The expectation for improvement in the second half of the year is based on industry forecasts for stronger automotive production, indications that customer destocking is ending, and expectations for stabilization of raw material costs, which are expected to result in an increase in demand for our products, particularly in Europe and China, and an improvement in our margins. EBIT for the Purification Solutions segment is expected to improve as we progress through the year as we realize the benefits from our transformation plan. The Specialty Fluids segment is expected to be divested in the third fiscal quarter, after which we would no longer include profits for that segment in our results. Given the challenging short-term business conditions we are experiencing in the first half of fiscal 2019, we are also closely managing our costs and capital spending levels as well as customer pricing in this dynamic environment.

Cash Flows and Liquidity

Overview

Our liquidity position, as measured by cash and cash equivalents plus borrowing availability, decreased by $281 million during the first three months of fiscal 2019, which was largely attributable to higher net working capital, share repurchases, the redemption of the preferred stock issued in the NHUMO, S.A. de C.V. (“NHUMO”) transaction and the refinancing of long-term debt with commercial paper. As of December 31, 2018, we had cash and cash equivalents of $142 million and borrowing availability under our revolving credit agreement of $503 million. Our revolving credit agreement supports our commercial paper program and may be used for working capital, letters of credit and other general corporate purposes.

At December 31, 2018, we were in compliance with all covenants under our revolving credit facility, including the total consolidated debt to consolidated EBITDA (earnings before interest, taxes, depreciation and amortization) covenant.

A significant portion of our business occurs outside the U.S. and our cash generation does not always align geographically with our cash needs. The vast majority of our cash and cash equivalent holdings tend to be held outside the U.S. Cash held by foreign subsidiaries is generally used to finance the subsidiaries’ operational activities and future investments. We use commercial paper throughout the year to manage short-term U.S. cash needs. The commercial paper balance is generally reduced at quarter-end using cash derived from customer collections, settlement of intercompany balances and short-term intercompany loans. The balance of commercial paper outstanding as of December 31, 2018 was $497 million. In the unusual event that additional funds are needed in the U.S., we have the ability to repatriate additional funds.

We generally manage our cash and debt on a global basis to provide for working capital requirements as needed by region or site. Cash and debt are generally denominated in the local currency of the subsidiary holding the assets or liabilities, except where there are operational cash flow reasons to hold non-functional currency or debt.

We anticipate sufficient liquidity from (i) cash on hand; (ii) cash flows from operating activities; and (iii) cash available from our revolving credit agreement and our commercial paper program to meet our operational and capital investment needs and financial obligations for the foreseeable future. The liquidity we derive from cash flows from operations is, to a large degree, predicated on our ability to collect our receivables in a timely manner, the cost of our raw materials, and our ability to manage inventory levels.

We issued $30 million of 7.42% medium term notes in fiscal 1999 that matured on December 11, 2018. We repaid these notes at maturity with a combination of cash on hand and commercial paper borrowings.

In November 2013, we purchased all of our joint venture partner’s common stock in the former NHUMO joint venture. At the close of the transaction, NHUMO issued redeemable preferred stock to the joint venture partner with a repurchase value of $25 million and a fixed dividend rate of 6% per annum. In November 2018, the preferred stock was repurchased for $25 million and a final dividend payment of approximately $1.4 million was made.

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The following discussion of the changes in our cash balance refers to the various sections of our Consolidated Statements of Cash Flows.

Cash Flows from Operating Activities

Cash used by operating activities, which consists of net income adjusted for the various non-cash items included in income, changes in working capital and changes in certain other balance sheet accounts, totaled $39 million in the first three months of fiscal 2019 compared to $45 million of cash provided by operating activities during the same period of fiscal 2018.

Cash used by operating activities in the first three months of fiscal 2019 was driven primarily by an increase in Inventories of $83 million, a decrease in Accounts payable and accrued liabilities of $75 million and the non-cash impact of a decrease in our deferred tax provision of $23 million, which more than offset our net income of $77 million. Partially offsetting these cash outflows were a decrease in Accounts and notes receivable of $47 million and the non-cash impact of depreciation and amortization of $35 million.

Cash provided by operating activities in the first three months of fiscal 2018 was driven primarily by the non-cash impacts of depreciation and amortization of $39 million and an increase in our deferred tax provision of $186 million, which more than offset our net loss of $112 million. Partially offsetting these cash inflows was an increase in Accounts and notes receivable of $19 million and Inventories of $41 million.

Cash Flows from Investing Activities

In the three months ended December 31, 2018, investing activities consumed $54 million of cash, which was primarily driven by capital expenditures. These capital expenditures were for sustaining and compliance capital projects at our operating facilities as well as capacity expansion capital expenditures in Reinforcement Materials and Performance Chemicals. In the three months ended December 31, 2017, investing activities consumed $101 million of cash which was primarily driven by $64 million of cash paid for our acquisition of Tech Blend, net of cash acquired of $1 million, and capital expenditures of $52 million.

Capital expenditures for fiscal 2019 are expected to be between $250 million and $275 million. Our planned capital spending program for fiscal 2019 is primarily for sustaining, compliance and improvement capital projects at our operating facilities as well as expansion capital expenditures in Reinforcement Materials and Performance Chemicals.

Cash Flows from Financing Activities

Financing activities provided $74 million of cash in the first three months of fiscal 2019 compared to $36 million of cash consumed in the first three months of fiscal 2018. In the first three months of fiscal 2019, financing activities primarily consisted of $248 million of proceeds from the issuance of commercial paper, which was partially offset by share repurchases of $62 million, dividend payments to stockholders of $20 million, the repayment of $74 million of fixed rate debt and the redemption of $25 million of preferred stock held by our former NHUMO joint venture partner.

In the first three months of fiscal 2018, financing activities consisted of share repurchases of $16 million and dividend payments to stockholders of $20 million.

Purchase Commitments

We have entered into long-term purchase agreements primarily for the purchase of raw materials. Under certain of these agreements the quantity of material being purchased is fixed, but the price paid changes as market prices change. For those commitments, the amounts included in the table below are based on market prices at December 31, 2018, which may differ from actual market prices at the time of purchase.

	Payments Due by Fiscal Year
	Remainder of Fiscal 2019		2020		2021		2022		2023		Thereafter		Total
	(In millions)
Reinforcement Materials	$	263	$	248	$	141	$	137	$	130	$	1,703	$	2,622
Performance Chemicals		73		59		55		55		32		454		728
Purification Solutions		6		6		1		—		—		—		13
Specialty Fluids		15		—		—		—		—		—		15
Total	$	357	$	313	$	197	$	192	$	162	$	2,157	$	3,378

Off-Balance Sheet Arrangements

As of December 31, 2018, we had no material transactions that meet the definition of an off-balance sheet arrangement.

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Forward-Looking Information

This report on Form 10-Q contains “forward-looking statements” under the Federal securities laws. These forward-looking statements address expectations or projections about the future, including our expectations for future financial performance and the factors we expect to impact our volumes, demand for our products, fixed costs and margins; when we expect the purchase price for our purchase of NSCC Carbon to be payable and the upgrades of that plant to be completed; when we expect the sale of our Specialty Fluids business to be completed and the amount and timing of the non-cash impairment charge we expect to record in connection with the transaction; when we expect to complete the transfer of certain benefit plan obligations and our estimate of the additional settlement gain or loss that may be incurred as a result of such transfer; the amount and timing of the charge to earnings we will record and the cash outlays we will make in connection with the closing of certain manufacturing facilities, restructuring initiatives and under our transformation plan for our Purification Solutions business; our estimated future amortization expenses for our intangible assets; the sufficiency of our cash on hand, cash provided from operations and cash available under our credit facilities to fund our cash requirements; uses of available cash including anticipated capital spending and future cash outlays associated with long-term contractual obligations; our expected tax rate for fiscal 2019; and the possible outcome of legal and environmental proceedings. From time to time, we also provide forward-looking statements in other materials we release to the public and in oral statements made by authorized officers.

Forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties, potentially inaccurate assumptions, and other factors, some of which are beyond our control or difficult to predict. If known or unknown risks materialize, our actual results could differ materially from those expressed in the forward-looking statements.

In addition to factors described elsewhere in this report, the following are some of the factors that could cause our actual results to differ materially from those expressed in the forward-looking statements: changes in raw material costs; lower than expected demand for our products; changes in environmental requirements in the U.S.; the loss of one or more of our important customers; our inability to complete capacity expansions or other development projects; the availability of raw materials; our failure to develop new products or to keep pace with technological developments; fluctuations in currency exchange rates; patent rights of others; stock and credit market conditions; the timely commercialization of products under development (which may be disrupted or delayed by technical difficulties, market acceptance, competitors’ new products, as well as difficulties in moving from the experimental stage to the production stage); demand for our customers’ products; competitors’ reactions to market conditions; unanticipated disruptions or delays in plant operations or development projects; delays in the successful integration of structural changes, including acquisitions or joint ventures; severe weather events that cause business interruptions, including plant and power outages or disruptions in supplier or customer operations; changes in global trade policies; the accuracy of the assumptions we used in establishing reserves for environmental matters and for our share of liability for respirator claims; and the outcome of pending litigation. Other factors and risks are discussed in our 2018 10-K.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Information about market risks for the period ended December 31, 2018 does not differ materially from that discussed under Item 7A of our 2018 10-K.

Item 4. Controls and Procedures

As of December 31, 2018, we carried out an evaluation, under the supervision and with the participation of our management, including our principal executive officer and our principal financial officer, of the effectiveness of our disclosure controls and procedures pursuant to Rule 13a-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Based upon that evaluation, our principal executive officer and our principal financial officer concluded that our disclosure controls and procedures were effective as of that date.

There were no changes in our internal control over financial reporting that occurred during our fiscal quarter ended December 31, 2018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

39

Part II. Other Information

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Purchases of Equity Securities

The table below sets forth information regarding Cabot’s purchases of its equity securities during the quarter ended December 31, 2018:

Period	Total Number of Shares Purchased(1)(2)		Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs(1)		Maximum Number (or Approximate Dollar Value) of Shares that May Yet Be Purchased Under the Plans  or Programs(1)
October 1, 2018—October 31, 2018		262,822	$	62.81		262,822		9,270,376
November 1, 2018—November 30, 2018		555,000	$	48.92		555,000		8,715,376
December 1, 2018—December 31, 2018		272,031	$	47.23		272,031		8,443,345
Total		1,089,853				1,089,853

⁽¹⁾ On July 13, 2018, Cabot publicly announced that the Board of Directors authorized the Company to repurchase up to an additional ten million shares of its common stock on the open market or in privately negotiated transactions, increasing the current balance of shares available for repurchase at that time to approximately eleven million shares. The current authorization does not have a set expiration date.

⁽²⁾ Total number of shares purchased does not include 111,305 shares withheld to pay taxes on the vesting of equity awards made under the Company’s equity incentive plans or to pay the exercise price of options exercised during the period.

Item 6. Exhibits

Exhibit No.	Description
Exhibit 3.1	Restated Certificate of Incorporation of Cabot Corporation effective January  9, 2009 (incorporated herein by reference to Exhibit 3.1 of Cabot’s Quarterly Report on Form 10-Q for the quarterly period ended December  31, 2008, file reference 1-5667, filed with the SEC on February 9, 2009).
Exhibit 3.2	The By-laws of Cabot Corporation as amended January  8, 2016 (incorporated herein by reference to Exhibit 3.1 of Cabot Corporation’s Quarterly Report on Form 10-Q for the quarterly period ended December 31, 2015, file reference 1-5667, filed with the SEC on February 5, 2016).
Exhibit 10.1*†	Cabot Corporation 2018 Short-Term Incentive Compensation Plan.
Exhibit 10.2*†	Summary of Compensation for Non-Employee Directors.
Exhibit 31.1*	Certification of Principal Executive Officer required by Rule 13a-14(a) or Rule 15d-14(a) of the Exchange Act.
Exhibit 31.2*	Certification of Principal Financial Officer required by Rule 13a-14(a) or Rule 15d-14(a) of the Exchange Act.
Exhibit 32**	Certifications of the Principal Executive Officer and the Principal Financial Officer pursuant to 18 U.S.C. Section 1350.
Exhibit 101.INS*	XBRL Instance Document.
Exhibit 101.SCH*	XBRL Taxonomy Extension Schema Document.
Exhibit 101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document.
Exhibit 101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document.
Exhibit 101.LAB*	XBRL Taxonomy Extension Label Linkbase Document.
Exhibit 101.PRE*	XBRL Taxonomy Extension Presentation Linkbase Document.

* Filed herewith.

** Furnished herewith.

† Management contract or compensatory plan or arrangement.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	CABOT CORPORATION
Date: February 7, 2019	By:	/S/ ERICA MCLAUGHLIN
		Erica McLaughlin
		Senior Vice President and Chief Financial Officer
		(Duly Authorized Officer)
Date: February 7, 2019	By:	/S/ JAMES P. KELLY
		James P. Kelly
		Vice President and Controller (Chief Accounting Officer)

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EX-10.1

Exhibit 10.1

CABOT CORPORATION

2018 SHORT-TERM INCENTIVE COMPENSATION PLAN

(effective November 8, 2018)

     The purpose of this 2018 Short-Term Incentive Compensation Plan (the “Plan”) is to provide incentives for certain senior executives and other key employees of Cabot Corporation (the “Company”) to achieve a sustained, high level of financial and other measures of success for the Company.

I. ADMINISTRATION

     The Plan will be administered by the Compensation Committee of the Board of Directors. The Compensation Committee may delegate some or all of its authority under the Plan to one or more of its members or to such other persons as it may determine, to the extent permitted by applicable law.  The Compensation Committee or any of its delegates to the extent of any delegation are referred to herein as the “Committee.”  The Committee shall have the authority to interpret the Plan and to otherwise do all things necessary or desirable to carry out the purposes of the Plan, and any interpretation or decision by the Committee with regard to the Plan or any Award shall be final and binding on all persons.

II. ELIGIBILITY; PARTICIPANTS

     Only executive officers and other key employees of the Company shall be eligible to participate in the Plan.  The Committee shall select, from among those eligible, the persons who shall from time to time participate in the Plan (each, a “Participant”).  Participation by an individual with respect to one Award under the Plan shall not entitle the individual to participate with respect to subsequent Awards, if any.

III. GRANT OF AWARDS

     The term “Award” as used in the Plan means an award opportunity that is granted to a Participant with respect to a performance period (the “Performance Period”).  A Participant who is granted an Award shall be entitled to a payment, if any, under the Award only if all conditions to payment have been satisfied in accordance with the Plan and the terms of the Award, unless otherwise determined by the Committee.  Except as otherwise specified by the Committee in connection with the grant of an Award, the Performance Period applicable to Awards under the Plan shall be the fiscal year of the Company.  For each Performance Period, the Committee shall select the Participants, if any, who are to receive Awards for such Performance Period and, in the case of each Award, shall establish the following:

(a) the Performance Goal or Goals (as defined in Section IV below) applicable to the Award;

(b) the amount or amounts that will be payable (subject to adjustment in accordance with Section V) if the Performance Goal or Goals are achieved; and

(c) such other terms and conditions as the Committee deems appropriate with respect to the Award.

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IV. PERFORMANCE GOALS

     As used in the Plan, the term “Performance Goal” means a measure of performance as determined by the Committee relating to any or any combination of the following (measured either absolutely or by reference to a peer group or select group of companies or an index or indices and determined either on a consolidated basis or, as the context permits, on a divisional, subsidiary, line of business, project or geographical basis or in combinations thereof and subject to such adjustments, if any, as the Committee specifies), which may include:  sales; revenues; assets; costs; earnings before or after deduction for all or any portion of interest, taxes, depreciation or amortization, whether or not on a continuing operations or an aggregate or per share basis; return on equity, investment, capital or assets;  one or more operating ratios or metrics; borrowing levels, leverage ratios or credit rating; market share; capital expenditures; cash flow; productivity measures; one or more working capital measures; stock price; stockholder return or shareholder value; sales of particular products or services; customer acquisition or retention; collection of outstanding accounts or debts; safety, health or environmental affairs performance; compliance; acquisitions and divestitures (in whole or in part); joint ventures and strategic alliances; spin-offs, split-ups and the like; reorganizations; recapitalizations, restructurings, financings (issuance of debt or equity); or refinancings.  A Performance Goal and any targets with respect thereto need not be based on an increase, a positive or improved result or avoidance of loss. An Award may specify more than one Performance Goal and, with respect to any Performance Goal, may specify levels of achievement at which different levels of payment may be earned. The Committee may adjust one or more of the Performance Goals applicable to an Award to reflect events (for example, the impact of charges for restructurings, discontinued operations, mergers, acquisitions, other unusual or infrequently occurring items, and the cumulative effects of tax or accounting changes) occurring during the applicable Performance Period that affect the applicable Performance Goal or Goals.

V. AMOUNT PAYABLE UNDER AWARDS

     As soon as practicable after the close of a Performance Period, the Committee shall determine whether and to what extent, if at all, the Performance Goal or Goals applicable to each Award granted for the Performance Period have been satisfied.  The Committee shall then determine the amount payable, if any, under each Award.  The Committee may, in its sole and absolute discretion and with or without specifying its reasons for doing so, after determining the amount that would otherwise be payable under an Award for a Performance Period, adjust (including to zero) the actual payment, if any, to be made under such Award. The Committee may exercise the discretion described in the immediately preceding sentence either in individual cases or in ways that affect more than one Participant.

VI. PAYMENT UNDER AWARDS

     Except as otherwise provided in this Section VI, all payments under the Plan will be made after the right to payment vests and in all events by March 15 of the calendar year following the calendar year in which the right to payment vests (or, if later, by the 15th day of the third month following the end of the Company's fiscal year in which the right to payment vests).  For purposes of the foregoing sentence, a right to payment will be treated as having vested when it is no longer subject to a substantial risk of forfeiture.  Payments hereunder are intended to satisfy the short-term deferral exception to Section 409A of the Internal Revenue Code of 1986, as amended, and the regulations and other guidance thereunder (“Section 409A”), and shall be construed and administered accordingly.  Notwithstanding

2

the foregoing, (i) if the Award letter or other documentation evidencing the Award provides a specified and objectively determinable payment date or schedule that satisfies the requirements of Section 409A, payment under an award may be made in accordance with such date or schedule, and (ii) the Committee may, but need not, permit a Participant to defer payment of an Award (pursuant to the Company’s  Deferred Compensation and Supplemental Retirement Plan or otherwise) beyond the date that the Award would otherwise be payable, provided that any such deferral shall be made in accordance with and subject to the applicable requirements of Section 409A.  Any amount so deferred may be adjusted for notional interest or other notional earnings on a basis determined by the Committee.

VII. PAYMENT LIMITS

     No Participant may be paid more than $5,000,000 in any fiscal year of the Company under Awards granted under the Plan.  In the case of an Award where payment is deferred pursuant to Section VI above, the preceding sentence shall be applied by assuming that payment of the Award was made at the time it would have been paid absent the deferral.

VIII. TAX WITHHOLDING

     All payments under the Plan shall be subject to reduction for applicable tax and other legally or contractually required withholdings.  Neither the Company nor any of its affiliates, nor the Committee, nor any person acting on behalf of the Company, any of its affiliates, or the Committee, will be liable for any adverse tax or other consequences to any Participant or to the estate or beneficiary of any Participant or to any other holder of an Award that may arise or otherwise be asserted with respect to the Award, including, but not limited to, by reason of the application of Section X(d) below or any acceleration of income or any additional tax (including any interest and penalties) asserted by reason of the failure of an Award to satisfy the requirements of 409A.

IX. AMENDMENT AND TERMINATION

     The Committee may amend or terminate the Plan at any time.

X. MISCELLANEOUS

     (a)Except as otherwise determined by the Committee at the time it grants the Award, no payment shall be made under an Award unless the Participant is employed by the Company on the last day of the Performance Period applicable to the Award.  Notwithstanding the foregoing, if a Participant ceases to be employed by the Company during a Performance Period by reason of death or disability or as otherwise determined by the Committee, the Committee may in its discretion authorize payment of all or a portion of any Awards held by such Participant to the Participant (or his or her estate) at the time other Awards are paid in respect of the Performance Period.

     (b)No person shall have any claim or right to be granted an Award, nor shall the selection for participation in the Plan for any Performance Period be construed as giving a Participant the right to be retained in the employ of the Company for that Performance Period or for any other period.  Further, no benefits received by any person from the grant or payment of an Award shall be considered a component of salary for any purpose, including, without limitation, any salary-related calculations for holiday, sick pay, termination payments, overtime or similar payments.

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     (c)The Plan shall be governed and construed by and determined in accordance with the laws of The Commonwealth of Massachusetts, without giving effect to any choice of law or conflict of law provision or rule (whether of The Commonwealth of Massachusetts or any other jurisdiction) that would cause the application of the laws of any jurisdiction other than The Commonwealth of Massachusetts.   By accepting an Award, each Participant shall be deemed to have submitted irrevocably and unconditionally to the jurisdiction of the federal and state courts located within the geographic boundaries of the United States District Court for the District of Massachusetts for the purpose of any suit, action or other proceeding arising out of or based on the Plan or any Award and waive any claim that he or she is not subject personally to the jurisdiction of the above-named courts.

(d)     The Committee may provide that Awards will be subject to forfeiture, termination or rescission, and that a Participant will be obligated to return to the Company payments received with respect to an Award, in connection with (i) a breach by the Participant of Award terms or the Plan, or any non-competition, non-solicitation, confidentiality or other covenant or agreement with the Company or any of its affiliates or (ii) an overpayment to the Participant of incentive compensation due to inaccurate financial data.  Without limiting the generality of the foregoing, the Committee may recover Awards and payments under any Award in accordance with any applicable Company clawback or recoupment policy, including the Cabot Corporation Recoupment Policy adopted on November 9, 2012 as such policy may be amended and in effect from time to time, or as otherwise required by applicable law or applicable stock exchange listing standards, including, without limitation, Section 10D of the Securities Exchange Act of 1934, as amended.  Each Participant, by accepting (or being deemed to have accepted) an Award pursuant to the Plan, agrees to return the full amount required under this Section X(d) at such time and in such manner as the Committee shall determine in its sole discretion, consistent with applicable law.

     (e)The Plan shall be effective as of the date adopted and shall remain in effect until terminated by the Committee or the Company’s Board of Directors.  This Plan supersedes and replaces any performance-based management incentive plan previously adopted by the Company for awards granted in fiscal years beginning on or after October 1, 2018.

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EX-10.2

Exhibit 10.2

Cabot Corporation

Summary of Compensation for Non-Employee Directors

The cash compensation payable to Cabot’s non-employee directors consists of an annual cash retainer for serving on the Board, an annual cash retainer for serving as non-Executive Chair of the Board, and an annual cash retainer for serving as Chair of any of the Audit, Compensation, Governance and Nominating, and Safety, Health, Environment and Sustainability Committees. Effective January 1, 2019, the annual cash compensation payable to Cabot’s non-employee directors consists of the following payments:

• An annual retainer of $90,000 for service on the Board of Directors

•     An annual retainer of $110,000 for service as Non-Executive Chair of the Board of Directors

• An annual retainer of $20,000 for service as Chair of the Audit Committee

• An annual retainer of $15,000 for service as Chair of the Compensation Committee

• An annual retainer of $10,000 for service as Chair of the Safety, Health, Environment and Sustainability, or Governance and Nominating Committees; it being understood that this retainer will not be paid to the Chair of the Governance and Nominating Committee if he/she is also serving as Non-Executive Chair of the Board of Directors

In addition, under Cabot’s 2015 Directors’ Stock Compensation Plan (the “Directors’ Stock Plan”), each non-employee director receives shares of Cabot common stock as a portion of his or her compensation for services performed in the calendar year. The dollar value of the award, or the number of shares awarded, is set each year by the Governance and Nominating Committee and, for calendar years beginning with calendar year 2019, the dollar value of the awards set by the Governance and Nominating Committee is $120,000. A pro rata grant is provided to any director who joins the Board during the calendar year.

EX-31.1

Exhibit 31.1

Principal Executive Officer Certification

I, Sean D. Keohane, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Cabot Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 7, 2019	/s/ SEAN D. KEOHANE
	Sean D. Keohane
	President and Chief Executive Officer

EX-31.2

Exhibit 31.2

Principal Financial Officer Certification

I, Erica McLaughlin, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Cabot Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 7, 2019	/S/ ERICA MCLAUGHLIN
	Erica McLaughlin
	Senior Vice President and Chief Financial Officer

EX-32

Exhibit 32

Certifications Pursuant to 18 U.S.C. Section 1350,

as Adopted Pursuant to Section 906 of the

Sarbanes-Oxley Act of 2002

In connection with the filing of the Quarterly Report on Form 10-Q for the quarter ended December 31, 2018 (the “Report”) by Cabot Corporation (the “Company”), each of the undersigned hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to his knowledge:

1. The Report fully complies with the requirements of section 13 (a) or 15 (d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 7, 2019	/S/ SEAN D. KEOHANE
	Sean D. Keohane
	President and Chief Executive Officer
Date: February 7, 2019	/S/ ERICA MCLAUGHLIN
	Erica McLaughlin
	Senior Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2018	Feb. 05, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	CBT
Entity Registrant Name	CABOT CORP
Entity Central Index Key	0000016040
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		59,520,108

XML

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales and other operating revenues	$ 821	$ 720
Cost of sales	655	544
Gross profit	166	176
Selling and administrative expenses	73	70
Research and technical expenses	16	15
Income (loss) from operations	77	91
Interest and dividend income	2	3
Interest expense	(15)	(13)
Other income (expense)	6	11
Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies	70	92
(Provision) benefit for income taxes	7	(205)
Equity in earnings of affiliated companies, net of tax		1
Net income (loss)	77	(112)
Net income (loss) attributable to noncontrolling interests, net of tax	8	10
Net income (loss) attributable to Cabot Corporation	$ 69	$ (122)
Weighted-average common shares outstanding:
Basic	59.9	61.9
Diluted	60.1	61.9
Earnings per common share:
Basic	$ 1.14	$ (1.98)
Diluted	1.14	(1.98)
Dividends per common share	$ 0.33	$ 0.315

XML

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 77	$ (112)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of tax provision (benefit) of $2 and $(2)	(24)
Derivatives: net investment hedges
(Gains) losses reclassified to interest expense, net of tax provision (benefit) of $— and $—	(1)	(1)
Pension and other postretirement benefit liability adjustments
Pension and other postretirement benefit liability adjustments arising during the period, net of tax	22
Other comprehensive income (loss)	(3)	(1)
Comprehensive income (loss)	74	(113)
Net income (loss) attributable to noncontrolling interests, net of tax	8	10
Foreign currency translation adjustment attributable to noncontrolling interests, net of tax		3
Comprehensive income (loss) attributable to noncontrolling interests, net of tax	8	13
Comprehensive income (loss) attributable to Cabot Corporation	$ 66	$ (126)

XML

Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Foreign currency translation adjustment, tax provision (benefit)	$ 2	$ (2)

XML

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018
Current assets:
Cash and cash equivalents	$ 142	$ 175
Accounts and notes receivable, net of reserve for doubtful accounts of $6 and $7	588	637
Inventories:
Raw materials	146	129
Work in process	3	3
Finished goods	390	329
Other	50	50
Total inventories	589	511
Prepaid expenses and other current assets	62	63
Total current assets	1,381	1,386
Property, plant and equipment, net	1,298	1,296
Goodwill	90	93
Equity affiliates	49	52
Intangible assets, net	94	98
Assets held for rent	125	118
Deferred income taxes	151	134
Other assets	67	67
Total assets	3,255	3,244
Current liabilities:
Short-term borrowings	515	249
Accounts payable and accrued liabilities	521	613
Income taxes payable	14	29
Current portion of long-term debt	5	35
Redeemable preferred stock		26
Total current liabilities	1,055	952
Long-term debt	671	719
Deferred income taxes	42	42
Other liabilities	211	252
Commitments and contingencies (Note G)
Preferred stock:
Authorized: 2,000,000 shares of $1 par value Issued and Outstanding: None and none
Common stock:
Authorized: 200,000,000 shares of $1 par value Issued: 59,709,462 and 60,566,375 shares Outstanding: 59,509,656 and 60,366,569 shares	60	61
Less cost of 199,806 and 199,806 shares of common treasury stock	(7)	(7)
Retained earnings	1,410	1,417
Accumulated other comprehensive income (loss)	(320)	(317)
Total Cabot Corporation stockholders' equity	1,143	1,154
Noncontrolling interests	133	125
Total stockholders' equity	1,276	1,279
Total liabilities and stockholders' equity	$ 3,255	$ 3,244

XML

Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Dec. 31, 2018		Sep. 30, 2018
Statement Of Financial Position [Abstract]
Accounts and notes receivable, reserve for doubtful accounts	$ 6		$ 7
Preferred stock, authorized shares	2,000,000		2,000,000
Preferred stock, par value	$ 1		$ 1
Preferred stock, Issued shares	0		0
Preferred stock, Outstanding shares	0		0
Common stock, authorized shares	200,000,000		200,000,000
Common stock, par value	$ 1	[1]	$ 1
Common stock, issued shares	59,709,462		60,566,375
Common stock, outstanding shares	59,509,656		60,366,569
Common treasury stock, shares	199,806		199,806

[1] 1

XML

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net income (loss)	$ 77	$ (112)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	35	39
Deferred tax provision (benefit)	(23)	186
Gain on sale of investments		(10)
Employee benefit plan settlement	6
Equity in net income of affiliated companies		(1)
Non-cash compensation	5	6
Changes in assets and liabilities:
Accounts and notes receivable	47	(19)
Inventories	(83)	(41)
Prepaid expenses and other current assets	(2)	(4)
Accounts payable and accrued liabilities	(75)	10
Income taxes payable	(15)	(3)
Other liabilities	(12)	(10)
Cash dividends received from equity affiliates	1	4
Cash provided (used) by operating activities	(39)	45
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(54)	(52)
Cash paid for acquisition of business, net of cash acquired of $— and $1		(64)
Proceeds from sale of investments		10
Change in assets held for rent	(1)
Other	1	5
Cash used by investing activities	(54)	(101)
Cash Flows from Financing Activities:
Borrowings under financing arrangements	18
Proceeds from (repayments of) issuance of commercial paper, net	248
Repayments of long-term debt	(74)
Repayments of redeemable preferred stock	(25)
Purchases of common stock	(62)	(16)
Cash dividends paid to noncontrolling interests	(11)
Cash dividends paid to common stockholders	(20)	(20)
Cash provided (used) by financing activities	74	(36)
Effects of exchange rate changes on cash	(14)	1
Increase (decrease) in cash and cash equivalents	(33)	(91)
Cash and cash equivalents at beginning of period	175	280
Cash and cash equivalents at end of period	$ 142	$ 189

XML

Consolidated Statements of Cash Flows (Parenthetical) (Unaudited) $ in Millions	3 Months Ended
	Dec. 31, 2017 USD ($)
Statement Of Cash Flows [Abstract]
Cash acquired in acquisition of business	$ 1

XML

Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Common Stock, Net of Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total Cabot Corporation Stockholders' Equity [Member]	Noncontrolling Interests [Member]
Beginning Balance at Sep. 30, 2017	$ 1,625	$ 56		$ 1,707	$ (259)	$ 1,504	$ 121
Beginning Balance, Shares at Sep. 30, 2017		61,884
Net income (loss)	(112)			(122)		(122)	10
Total other comprehensive income (loss)	(1)				(4)	(4)	3
Cash dividends paid to common stockholders	(20)			(20)		(20)
Cash dividends declared to noncontrolling interests	(10)						(10)
Issuance of stock under equity compensation plans, Shares		178
Amortization of share-based compensation	6		$ 6			6
Purchase and retirement of common stock	(16)		(6)	(10)		(16)
Purchase and retirement of common stock, Shares		(265)
Ending Balance at Dec. 31, 2017	1,472	$ 56		1,555	(263)	1,348	124
Ending Balance, Shares at Dec. 31, 2017		61,797
Beginning Balance at Sep. 30, 2018	1,279	$ 54		1,417	(317)	1,154	125
Beginning Balance, Shares at Sep. 30, 2018		60,367
Net income (loss)	77			69		69	8
Total other comprehensive income (loss)	(3)				(3)	(3)
Cash dividends paid to common stockholders	(20)			(20)		(20)
Issuance of stock under equity compensation plans, Shares		344
Amortization of share-based compensation	5		5			5
Purchase and retirement of common stock	(62)	$ (1)	$ (5)	(56)		(62)
Purchase and retirement of common stock, Shares		(1,201)
Ending Balance at Dec. 31, 2018	$ 1,276	$ 53		$ 1,410	$ (320)	$ 1,143	$ 133
Ending Balance, Shares at Dec. 31, 2018		59,510

XML

Basis of Presentation

3 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Basis of Presentation

A. Basis of Presentation

The consolidated financial statements have been prepared in conformity with accounting policies generally accepted in the United States (“U.S.”) and include the accounts of Cabot Corporation (“Cabot” or the “Company”) and its wholly owned subsidiaries and majority-owned and controlled U.S. and non-U.S. subsidiaries. Additionally, Cabot considers consolidation of entities over which control is achieved through means other than voting rights. Intercompany transactions have been eliminated in consolidation.

The unaudited consolidated financial statements have been prepared in accordance with the requirements of Form 10-Q and consequently do not include all disclosures required by Form 10-K. Additional information may be obtained by referring to Cabot’s Annual Report on Form 10-K for its fiscal year ended September 30, 2018 (“2018 10-K”).

The financial information submitted herewith is unaudited and reflects all adjustments which are, in the opinion of management, necessary to provide a fair statement of the results for the interim periods ended December 31, 2018 and 2017. All such adjustments are of a normal recurring nature. The results for interim periods are not necessarily indicative of the results to be expected for the fiscal year.

Effective October 1, 2018, the Company adopted the new revenue recognition standard that amended the pre-existing accounting standard for revenue recognition. The Company used a modified retrospective approach, which is discussed in further detail in Note B.

Effective October 1, 2018, the Company adopted the new pension standard that amended the requirements on the presentation of net periodic pension and postretirement benefit costs. The Company used a retrospective transition method to reclassify net periodic benefit cost, other than the service component, from Cost of sales, Selling and administrative expenses and Research and technical expenses to Other income (expense) in the Consolidated Statements of Income for the prior periods presented, which is discussed in further detail in Note B.

In October 2018, the Company realigned its business reporting structure under the Performance Chemicals segment and now combines the specialty carbons, fumed metal oxides and aerogel product lines into the Performance Additives business, and the specialty compounds and inkjet product lines into the Formulated Solutions business. Prior period Performance Chemicals segment revenue results have been recast to reflect the realignment.

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Significant Accounting Policies

3 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Significant Accounting Policies

B. Significant Accounting Policies

Revenue Recognition

Cabot recognizes revenue when its customers obtain control of promised goods or services. The revenue recognized is the amount of consideration which the Company expects to receive in exchange for those goods or services. Cabot derives the majority of its revenues from contracts for the sale of products from its Reinforcement Materials, Performance Chemicals and Purification Solutions segments. The Company’s contracts with customers are generally for products only and do not include other performance obligations. Generally, Cabot considers purchase orders, which in some cases are governed by master supply agreements, to be contracts with customers. The transaction price as specified on the purchase order or sales contract is considered the standalone selling price for each distinct product. To determine the transaction price at the time when revenue is recognized, the Company evaluates whether the price is subject to adjustments, such as for returns, discounts or volume rebates, which are stated in the customer contract, to determine the net consideration to which the Company expects to be entitled. Revenue from product sales is recognized based on a point in time model when control of the product is transferred to the customer, which typically occurs upon shipment or delivery of the product to the customer and title, risk and rewards of ownership have passed to the customer. Payment terms typically range from zero to ninety days.

Shipping and handling activities that occur after the transfer of control to the customer are billed to customers and are recorded as sales revenue, as the Company considers these to be fulfillment costs. Shipping and handling costs are expensed in the period incurred and included in Cost of sales within the Consolidated Statement of Operations. Taxes collected on sales to customers are excluded from the transaction price.

The Company generally provides a warranty that its products will substantially conform to the identified specifications. The Company’s liability typically is limited to either a credit equal to the purchase price or replacement of the non-conforming product. Returns under warranty have historically been immaterial.

Revenue in the Specialty Fluids segment arises primarily from the rental of cesium formate. This revenue is recognized throughout the rental period based on the contracted rental terms. During the three months ended December 31, 2018, the Company recognized revenue of $8 million related to the rental of cesium formate. Customers are also billed and revenue is recognized, typically at the end of the rental period, for cesium formate product that is not returned. The Company also generates revenues from cesium formate sold outside of the rental process and from the sale of fine cesium chemicals. This revenue is recognized when control of the product transfers to the customer, which is typically upon delivery of the product.

The Company does not have contract assets or liabilities that are material.

As permitted by the revenue recognition standard, Revenue from Contracts with Customers, when the period of time between the transfer of control of the goods and the time the customer pays for the goods is one year or less, the Company does not consider there to be a significant financing component associated with the contract.

Intangible Assets and Goodwill Impairment

The Company records tangible and intangible assets acquired and liabilities assumed in business combinations under the acquisition method of accounting. Amounts paid for an acquisition are allocated to the assets acquired and liabilities assumed based on their fair values at the date of acquisition. The Company uses assumptions and estimates in determining the fair value of assets acquired and liabilities assumed in a business combination. The determination of the fair value of intangible assets requires the use of significant judgment with regard to assumptions used in the valuation model. The Company estimates the fair value of identifiable acquisition-related intangible assets principally based on projections of cash flows that will arise from these assets. The projected cash flows are discounted to determine the fair value of the assets at the dates of acquisition.

Definite-lived intangible assets, which are comprised of trademarks, customer relationships and developed technologies, are amortized over their estimated useful lives and are reviewed for impairment when indication of potential impairment exists, such as a significant reduction in cash flows associated with the assets.

Goodwill is comprised of the purchase price of business acquisitions in excess of the fair value assigned to the net tangible and identifiable intangible assets acquired. Goodwill is not amortized, but is reviewed for impairment annually as of May 31, or when events or changes in the business environment indicate that the carrying value of the reporting unit may exceed its fair value. A reporting unit, for the purpose of the impairment test, is at or below the operating segment level, and constitutes a business for which discrete financial information is available and regularly reviewed by segment management. Reinforcement Materials, and the fumed metal oxides and specialty compounds product lines within Performance Chemicals, which are considered separate reporting units, carry the Company’s goodwill balances as of December 31, 2018.

For the purpose of the goodwill impairment test, the Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If an initial qualitative assessment identifies that it is more likely than not that the carrying value of a reporting unit exceeds its estimated fair value, an additional quantitative evaluation is performed. Alternatively, the Company may elect to proceed directly to the quantitative goodwill impairment test. If based on the quantitative evaluation the fair value of the reporting unit is less than its carrying amount, a goodwill impairment loss would result. The goodwill impairment loss would be the amount by which the carrying value of the reporting unit, including goodwill, exceeds its fair value, limited to the total amount of goodwill allocated to that reporting unit. The fair value of a reporting unit is based on discounted estimated future cash flows. The fair value is also benchmarked against a market approach using the guideline public companies method. The assumptions used to estimate fair value include management’s best estimates of future growth rates, operating cash flows, capital expenditures and discount rates over an estimate of the remaining operating period at the reporting unit level. Based on the Company’s most recent annual goodwill impairment test performed as of May 31, 2018, the fair values of the Reinforcement Materials, Fumed Metal Oxides and Specialty Compounds reporting units were substantially in excess of their carrying values. No events occurred subsequent to the last impairment evaluation that would suggest that it is more likely than not that the carrying values of any of the Company’s reporting units exceeded their fair value.

Long-lived Assets Impairment

The Company’s long-lived assets primarily include property, plant and equipment, intangible assets, long-term investments and assets held for rent. The carrying values of long-lived assets are reviewed for impairment whenever events or changes in business circumstances indicate that the carrying amount of an asset may not be recoverable.

To test for impairment of assets, the Company generally uses a probability-weighted estimate of the future undiscounted net cash flows of the assets over their remaining lives to determine if the value of the asset is recoverable. Long-lived assets are grouped with other assets and liabilities at the lowest level for which independent identifiable cash flows are determinable.

An asset impairment is recognized when the carrying value of the asset is not recoverable based on the analysis described above, in which case the asset is written down to its fair value. If the asset does not have a readily determinable market value, a discounted cash flow model may be used to determine the fair value of the asset. In circumstances when an asset does not have separately identifiable cash flows, an impairment charge is recorded when the Company no longer intends to use the asset.

The Company continues to pursue strategic options for its Purification Solutions business. Depending on the actions taken, there could be a negative impact on the fair value of the Purification Solution reporting unit, which may lead to impairment.

Property, Plant and Equipment

Property, plant and equipment are recorded at cost. Depreciation of property, plant and equipment is calculated using the straight-line method over the estimated useful lives of the related assets. The depreciable lives for buildings, machinery and equipment, and other fixed assets are between twenty and twenty-five years, ten and twenty-five years, and three and twenty-five years, respectively. The cost and accumulated depreciation for property, plant and equipment sold, retired, or otherwise disposed of are removed from the Consolidated Balance Sheets and resulting gains or losses are included in earnings in the Consolidated Statements of Operations. Expenditures for repairs and maintenance are charged to expenses as incurred. Expenditures for major renewals and betterments, which significantly extend the useful lives of existing plant and equipment, are capitalized and depreciated.

Income Tax in Interim Periods

The Company records its tax provision or benefit on an interim basis using an estimated annual effective tax rate. This rate is applied to the current period ordinary income or loss to determine the income tax provision or benefit allocated to the interim period. Losses from jurisdictions for which no benefit can be recognized and the income tax effects of unusual or infrequent items are excluded from the estimated annual effective tax rate and are recognized in the impacted interim period.

Valuation allowances are provided against the future tax benefits that arise from the deferred tax assets in jurisdictions for which no benefit can be recognized. The estimated annual effective tax rate may be significantly impacted by nondeductible expenses and the Company’s projected earnings mix by tax jurisdiction. Adjustments to the estimated annual effective income tax rate are recognized in the period when such estimates are revised.

Inventory Valuation

Inventories are stated at the lower of cost or market. The cost of Specialty Fluids inventories that are classified as assets held for rent is determined using the average cost method. The cost of all other inventories is determined using the FIFO method.

Cabot periodically reviews inventory for both potential obsolescence and potential declines in anticipated selling prices. In this review, the Company makes assumptions about the future demand for and market value of the inventory, and based on these assumptions estimates the amount of any obsolete, unmarketable, slow moving, or overvalued inventory. Cabot writes down the value of these inventories by an amount equal to the difference between the cost of the inventory and its estimated net realizable value.

Pensions and Other Postretirement Benefits

The Company recognizes the funded status of defined benefit pension and other postretirement benefit plans as an asset or liability. This amount is defined as the difference between the fair value of plan assets and the benefit obligation. The Company is required to recognize as a component of Other comprehensive income (loss), net of tax, the actuarial gains/losses and prior service costs/credits that arise but were not previously required to be recognized as components of net periodic benefit cost. Other comprehensive income (loss) is adjusted as these amounts are later recognized in income as components of net periodic benefit cost.

Redeemable Preferred Stock

In November 2013, the Company purchased all of its joint venture partner’s common stock in the former NHUMO, S.A. de C.V. (“NHUMO”) joint venture. At the close of the transaction, NHUMO issued redeemable preferred stock to the joint venture partner with a repurchase value of $25 million and a fixed dividend rate of 6% per annum. In November 2018, the preferred stock was repurchased for $25 million and a final dividend payment of approximately $1.4 million was made. The preferred stock was accounted for as a financing obligation and was separately presented in the Consolidated Balance Sheets as a current liability as of September 30, 2018.

Accumulated Other Comprehensive Income (Loss)

Accumulated other comprehensive income (loss) (“AOCI”), which is included as a component of stockholders’ equity, includes unrealized gains or losses on available-for-sale marketable securities and derivative instruments, currency translation adjustments in foreign subsidiaries, translation adjustments on foreign equity securities and minimum pension liability adjustments.

Recently Adopted Accounting Standards

In May 2014, the FASB issued a new standard, Revenue from Contracts with Customers, that amended the existing accounting standards for revenue recognition. The standard requires entities to recognize revenue when they transfer promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. This standard is applicable for fiscal years beginning after December 15, 2017. The Company adopted this standard on October 1, 2018 and applied a modified retrospective approach. The comparative information has not been restated and continues to be reported under the accounting standards in effect during those periods, as discussed in the Company’s 2018 10-K.

The adoption of this standard did not have an impact on how the Company recognizes revenue. As such, an adjustment to opening retained earnings was not required as a result of adopting this new standard. The Company implemented the updates that were necessary to its revenue recognition policy, internal controls, processes and financial statement disclosures as part of this adoption. The updated disclosures are reflected under the heading “Revenue Recognition” within Note B and the Company’s disaggregated revenue is reflected within Note N.

In addition, as part of an assessment performed in connection with adopting this standard, the Company reviewed its classification of by-product sales, which consist of sales generated from the production of steam or electricity from the Company's energy centers primarily from its carbon black manufacturing sites and sales of hydrochloric acid generated from the production of fumed silica. Historically, the Company presented by-product sales as a reduction of Cost of sales within the Consolidated Statement of Operations. However, upon further evaluation of these sales in connection with the implementation of this standard, the Company determined that it is appropriate to present by-product sales as Net sales and other operating revenues. Effective October 1, 2018, these sales are now included within Net sales and other operating revenues in the Consolidated Statement of Operations. This change did not result in a cumulative adjustment to opening retained earnings as it is a classification change within the Consolidated Statement of Operations. If the Company had continued to classify by-product sales within Cost of sales, there would have been a decrease to Net sales and other operating revenues and Cost of sales of $20 million for the three months ended December 31, 2018.

In August 2016, the FASB issued final amendments to clarify how entities should classify certain cash receipts and cash payments on the statement of cash flows, such as distributions received from equity method investees, proceeds from the settlement of insurance claims, and proceeds from the settlement of corporate-owned life insurance policies. The new standard is effective for fiscal years beginning after December 15, 2017, including interim periods within those years, and early adoption is permitted. The Company adopted this standard on October 1, 2018. The adoption of this standard did not have a material impact to the Company’s consolidated financial statements.

In March 2017, the FASB issued a new standard that amends the requirements on the presentation of net periodic pension and postretirement benefit costs. The new standard requires the service cost component to be presented with other employee compensation costs. The other components will be reported separately outside of operations. Only the service cost component will be eligible for capitalization. Entities are required to use a retrospective transition method to adopt the requirement for separate income statement presentation of the service cost and other components, and a prospective transition method to adopt the requirement to limit the capitalization of benefit cost to the service component. The Company adopted the standard on October 1, 2018 and used a retrospective transition method to reclassify net periodic benefit cost, other than the service component, from Cost of sales, Selling and administrative expenses and Research and technical expenses to Other income (expense) in the Consolidated Statements of Operations for the prior periods presented. In accordance with the standard, the Company utilized prior period footnote disclosures as a practical expedient to apply these retrospective presentations, which is shown in the table below:

Consolidated Statements of Operations	Three Months Ended December 31
	2017
	As Originally Reported		Effect of Change			As Adjusted
	(In millions, except per share amounts)
Cost of sales	$	542	$	2		$	544
Gross profit	$	178	$	(2	)	$	176
Selling and administrative expenses	$	69	$	1		$	70
Research and technical expenses	$	15	$	—		$	15
Income (loss) from operations	$	94	$	(3	)	$	91
Other income (expense)	$	8	$	3		$	11

Recent Accounting Pronouncements

In February 2016, the FASB issued a new standard for the accounting for leases. This new standard requires lessees to recognize assets and liabilities for most leases, but recognize expenses on their income statements in a manner that is similar to the current accounting treatment for leases. The standard is applicable for fiscal years beginning after December 15, 2018 and for interim periods within those years, and early adoption is permitted. The Company expects to adopt the standard on October 1, 2019. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements. The Company has established a project plan and implementation team which will analyze the current portfolio of leases to determine the impact of adopting this new standard. The implementation team will also be responsible for evaluating and designing the necessary changes to the Company’s business processes, lease policies, systems and internal controls to support recognition and disclosure under the new guidance.

In February 2018, the FASB issued a new standard that allows entities to reclassify from AOCI to Retained earnings stranded tax effects resulting from changes made as a result of the Tax Cuts and Jobs Act of 2017 (the “Act”). The amendments in this new standard also require certain disclosures about stranded tax effects. The new standard is effective for all entities for fiscal years beginning after December 15, 2018, including interim periods within those years, and early adoption is permitted. The Company is evaluating this standard and the timing of its adoption. The adoption of this standard is not expected to materially impact the Company’s consolidated financial statements.

In August 2018, the FASB issued a new standard to align the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The updated guidance also requires an entity to expense the capitalized implementation costs of a cloud computing arrangement that is a service contract over the term of the arrangement and includes expanded disclosure requirements for such costs. This guidance is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted, and the guidance may be applied either retrospectively or prospectively. The Company is evaluating this standard and the timing of its adoption. The Company does not expect the adoption of this guidance to have a material impact on its consolidated financial statements and related disclosures.

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Acquisitions

3 Months Ended

Dec. 31, 2018

Business Combinations [Abstract]

Acquisitions

C. Acquisitions

Tech Blend

In November 2017, the Company acquired Tech Blend, a North American producer of black masterbatches, for a purchase price of $65 million, paid in cash. The purchase price was subject to a working capital adjustment, which was immaterial. The operating results of the business are included in the Company’s Performance Chemicals segment. The acquisition extended the Company’s global footprint in black masterbatch and compounds and provides a platform to serve global customers and grow in conductive formulations.

The allocation of the purchase price set forth below was based on estimates of the fair value of assets acquired and liabilities assumed.

	(In millions)
Assets
Cash	$	1
Accounts receivable		5
Inventories		3
Property, plant and equipment		7
Intangible assets		29
Goodwill		33
Total assets acquired		78
Liabilities
Current liabilities		(3	)
Deferred tax liabilities		(10	)
Total liabilities assumed		(13	)
Cash consideration paid	$	65

As part of the purchase price allocation, the Company determined the separately identifiable intangible assets are comprised of developed technologies of $21 million, which will be amortized over twenty-five years, and customer relationships of $8 million, which will be amortized over twelve years. The Company estimated the fair values of the identifiable acquisition-related intangible assets based on projections of cash flows that will arise from those assets. The projected cash flows were discounted to determine the fair value of the assets at the date of acquisition. The determination of the fair value of the intangible assets acquired required the use of significant judgment with regard to (i) assumptions in the discounted cash flow model used and (ii) determination of the useful lives of the developed technologies and customer relationships.

The excess of the purchase price over the fair value of the tangible net assets and intangible assets acquired was recorded as goodwill. The goodwill recognized is attributable to the growth and operating synergies that the Company expects to realize from this acquisition. Goodwill generated from the acquisition is not deductible for tax purposes.

NSCC Carbon (Jiangsu) Co. Ltd

In September 2018, the Company acquired NSCC Carbon, a carbon black manufacturing facility in Pizhou, Jiangsu Province, China for a purchase price of $8 million. The purchase price is payable upon satisfaction of certain conditions that are expected to be satisfied in less than twelve months and is recorded within Accounts payable and accrued liabilities on the Consolidated Balance Sheets. The Company plans to modify this manufacturing facility to produce specialty carbons. The plant is temporarily mothballed. The modifications are expected to be completed, and production is expected to commence, in 2021. The Company has incurred $2 million of transition related costs in the first quarter of fiscal 2019 related to this acquisition.

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Employee Benefit Plans

3 Months Ended

Dec. 31, 2018

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plans

D. Employee Benefit Plans

Net periodic defined benefit pension and other postretirement benefit costs include the following:

	Three Months Ended December 31
	2018						2017						2018				2017
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.		Foreign		U.S.			Foreign
	(In millions)
Service cost	$	—		$	2		$	—		$	2		$	—	$	—	$	—		$	—
Interest cost		1			2			1			2			—		—		—			—
Expected return on plan assets		(2	)		(4	)		(2	)		(4	)		—		—		—			—
Amortization of prior service credit		—			—			—			—			—		—		(1	)		—
Amortization of actuarial loss		—			1			—			1			—		—		—			—
Settlement and curtailment gain		—			(6	)		—			—			—		—		—			—
Net periodic benefit (credit) cost	$	(1	)	$	(5	)	$	(1	)	$	1		$	—	$	—	$	(1	)	$	—

Curtailments and Settlements of Employee Benefit Plans

In December 2018, the Company transferred the majority of the defined benefit obligations and pension plan assets in one of its foreign defined benefit plans to a multi-employer plan. This action moved the administrative, asset custodial, asset investment, actuarial, communication and benefit payment obligations to the multi-employer fund administrator. As a result of the transfer, there was a $30 million reduction in net pension obligations associated with the plan, and a pre-tax gain of $6 million was recorded in the first quarter of fiscal 2019, which is included in Other income (expense) in the Consolidated Statement of Operations. The pre-tax gain consisted of a curtailment credit of less than $1 million for the accelerated recognition of prior service credit and a settlement credit of $5 million for the accelerated recognition of the unrecognized gain upon the transfer of the assets. As of December 31, 2018, approximately $8 million of plan assets remain to be transferred. Such assets are expected to be transferred by the third quarter of fiscal 2019 and such transfer may result in an additional immaterial settlement gain or loss. In addition, as part of the transfer the Company recorded a $3 million charge for the Company’s agreement to fund the actuarial loss gap between the terminated plan and the multi-employer plan, which will be paid over the next five years. This charge is included Other income (expense) in the Consolidated Statement of Operations and the liability is included in Accounts payable and accrued liabilities and Other liabilities on the Consolidated Balance Sheet.

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Goodwill and Intangible Assets

3 Months Ended

Dec. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

E. Goodwill and Intangible Assets

The carrying amount of goodwill attributable to each reportable segment with goodwill balances and the changes in those balances during the three month period ended December 31, 2018 are as follows:

	Reinforcement Materials			Performance Chemicals			Total
	(In millions)
Balance at September 30, 2018	$	52		$	41		$	93
Foreign currency impact		(2	)		(1	)		(3	)
Balance at December 31, 2018	$	50		$	40		$	90

The following table provides information regarding the Company’s intangible assets:

	December 31, 2018							September 30, 2018
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(In millions)
Intangible assets with finite lives
Developed technologies	$	51	$	(2	)	$	49	$	52	$	(2	)	$	50
Trademarks		8		—			8		8		—			8
Customer relationships		49		(12	)		37		51		(11	)		40
Total intangible assets	$	108	$	(14	)	$	94	$	111	$	(13	)	$	98

Intangible assets are amortized over their estimated useful lives, which range between twelve and twenty-five years, with a weighted average amortization period of approximately nineteen years. Amortization expense for the three month periods ended December 31, 2018 and 2017 was $1 million and $2 million, respectively, and is included in Cost of sales and Selling and administrative expenses in the Consolidated Statements of Operations.Total amortization expense is estimated to be approximately $6 million each year for the next five fiscal years.

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Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Dec. 31, 2018

Stockholders Equity Note [Abstract]

Accumulated Other Comprehensive Income (Loss)

F. Accumulated Other Comprehensive Income (Loss)

Comprehensive income combines net income (loss) and other comprehensive income items, which are reported as components of stockholders’ equity in the accompanying Consolidated Balance Sheets.

Changes in each component of AOCI, net of tax, were as follows:

	Currency Translation Adjustment			Unrealized Gains on Investments		Pension and Other Postretirement Benefit Liability Adjustments			Total
	(In millions)
Balance at September 30, 2018, attributable to Cabot Corporation	$	(266	)	$	1	$	(52	)	$	(317	)
Other comprehensive income (loss) before reclassifications		(24	)		—		30			6
Amounts reclassified from AOCI		(1	)		—		(8	)		(9	)
Less: Other comprehensive income (loss) attributable to    noncontrolling interests		—			—		—			—
Balance at December 31, 2018, attributable to Cabot Corporation	$	(291	)	$	1	$	(30	)	$	(320	)

The amounts reclassified out of AOCI and into the Consolidated Statements of Operations in the three months ended December 31, 2018 and 2017 were as follows:

	Affected Line Item in the Consolidated	Three Months Ended December 31
	Statements of Operations	2018			2017
		(In millions)
Derivatives: net investment hedges
(Gains) losses reclassified to interest    expense	Interest expense	$	(1	)	$	(1	)
Pension and other postretirement    benefit liability adjustment
Amortization of actuarial losses	Net Periodic Benefit Cost - see    Note D for details		1			1
Amortization of prior service credit	Net Periodic Benefit Cost - see    Note D for details		—			(1	)
Settlement and curtailment gain	Net Periodic Benefit Cost - see    Note D for details		(6	)		—
Total before tax			(6	)		(1	)
Tax impact	Provision (benefit) for income    taxes		(3	)		—
Total after tax		$	(9	)	$	(1	)

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Commitments and Contingencies

3 Months Ended

Dec. 31, 2018

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

G. Commitments and Contingencies

Purchase Commitments

Cabot has entered into long-term purchase agreements primarily for the purchase of raw materials. Under certain of these agreements, the quantity of material being purchased is fixed, but the price paid changes as market prices change. For these purchase commitments, the amounts included in the table below are based on market prices at December 31, 2018, which may differ from actual market prices at the time of purchase.

	Payments Due by Fiscal Year
	Remainder of Fiscal 2019		2020		2021		2022		2023		Thereafter		Total
	(In millions)
Reinforcement Materials	$	263	$	248	$	141	$	137	$	130	$	1,703	$	2,622
Performance Chemicals		73		59		55		55		32		454		728
Purification Solutions		6		6		1		—		—		—		13
Specialty Fluids		15		—		—		—		—		—		15
Total	$	357	$	313	$	197	$	192	$	162	$	2,157	$	3,378

Guarantee Agreements

Cabot has provided certain indemnities pursuant to which it may be required to make payments to an indemnified party in connection with certain transactions and agreements. In connection with certain acquisitions and divestitures, Cabot has provided routine indemnities with respect to such matters as environmental, tax, insurance, product and employee liabilities. In connection with various other agreements, including service and supply agreements with customers, Cabot has provided indemnities for certain contingencies and routine warranties. Cabot is unable to estimate the maximum potential liability for these types of indemnities as a maximum obligation is not explicitly stated in most cases and the amounts, if any, are dependent upon the outcome of future contingent events, the nature and likelihood of which cannot be reasonably estimated. The duration of the indemnities vary, and in many cases are indefinite. Cabot has not recorded any liability for these indemnities in the consolidated financial statements, except as otherwise disclosed.

Contingencies

Cabot is a defendant, or potentially responsible party, in various lawsuits and environmental proceedings wherein substantial amounts are claimed or at issue.

Environmental Matters

As of December 31, 2018 and September 30, 2018, Cabot had $14 million and $15 million, respectively, reserved for environmental matters. These environmental matters mainly relate to former operations. The Company’s reserves for environmental matters represent Cabot’s best estimates of the probable costs to be incurred at those sites where costs are reasonably estimable based on the Company’s analysis of the extent of clean up required, alternative clean-up methods available, abilities of other responsible parties to contribute and its interpretation of laws and regulations applicable to each site.

Cash payments related to these environmental matters were $1 million and less than $1 million in the first three months of fiscal 2019 and fiscal 2018, respectively. Cabot reviews the adequacy of the reserves as circumstances change at individual sites and adjusts the reserves as appropriate. Almost all of Cabot’s environmental issues relate to sites that are mature and have been investigated and studied and, in many cases, are subject to agreed upon remediation plans. However, depending on the results of future testing, changes in risk assessment practices, remediation techniques and regulatory requirements, newly discovered conditions, and other factors, it is reasonably possible that the Company could incur additional costs in excess of environmental reserves currently recorded. Management estimates, based on the latest available information, that any such future environmental remediation costs that are reasonably possible to be in excess of amounts already recorded would be immaterial to the Company’s consolidated financial statements.

Respirator Liabilities

Cabot has exposure in connection with a safety respiratory products business that a subsidiary acquired from American Optical Corporation (“AO”) in an April 1990 asset purchase transaction. The subsidiary manufactured respirators under the AO brand and disposed of that business in July 1995. In connection with its acquisition of the business, the subsidiary agreed, in certain circumstances, to assume a portion of AO’s liabilities, including costs of legal fees together with amounts paid in settlements and judgments, allocable to AO respiratory products used prior to the 1990 purchase by the Cabot subsidiary. In exchange for the subsidiary’s assumption of certain of AO’s respirator liabilities, AO agreed to provide to the subsidiary the benefits of: (i) AO’s insurance coverage for the period prior to the 1990 acquisition and (ii) a former owner’s indemnity of AO holding it harmless from any liability allocable to AO respiratory products used prior to May 1982. As more fully described in the 2018 10-K, the respirator liabilities generally involve claims for personal injury, including asbestosis, silicosis and coal worker’s pneumoconiosis, allegedly resulting from the use of respirators that are alleged to have been negligently designed and/or labeled. Neither Cabot, nor its past or present subsidiaries, at any time manufactured asbestos or asbestos-containing products. At no time did this respiratory product line represent a significant portion of the respirator market.

As of both December 31, 2018 and September 30, 2018, there were approximately 35,000 claimants in pending cases asserting claims against AO in connection with respiratory products. Cabot has a reserve to cover its expected share of liability for existing and future respirator liability claims. At December 31, 2018 and September 30, 2018, the reserve was $24 million and $25 million, respectively. The Company made payments related to its respirator liability of $1 million and less than $1 million in the first three months of fiscal 2019 and fiscal 2018, respectively.

The Company’s current estimate of the cost of its share of existing and future respirator liability claims is based on facts and circumstances existing at this time. Developments that could affect the Company’s estimate include, but are not limited to, (i) significant changes in the number of future claims, (ii) changes in the rate of dismissals without payment of pending claims, (iii) significant changes in the average cost of resolving claims, (iv) significant changes in the legal costs of defending these claims, (v) changes in the nature of claims received, (vi) trial and appellate outcomes, (vii) changes in the law and procedure applicable to these claims, (viii) the financial viability of other parties that contribute to the settlement of respirator claims, (ix) a change in the availability of insurance coverage maintained by certain of the other parties that contribute to the settlement of respirator claims, or the indemnity provided by a former owner of the business, (x) changes in the allocation of costs among the various parties paying legal and settlement costs, and (xi) a determination that the assumptions that were used to estimate Cabot’s share of liability are no longer reasonable. The Company cannot determine the impact of these potential developments on its current estimate of its share of liability for existing and future claims. Accordingly, the actual amount of these liabilities for existing and future claims could be larger than the reserved amount.

Other Matters

The Company has various other lawsuits, claims and contingent liabilities arising in the ordinary course of its business and with respect to its divested businesses. The Company does not believe that any of these matters will have a material adverse effect on its financial position; however, litigation is inherently unpredictable. Cabot could incur judgments, enter into settlements or revise its expectations regarding the outcome of certain matters, and such developments could have a material impact on its results of operations in the period in which the amounts are accrued or its cash flows in the period in which the amounts are paid.

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Income Tax

3 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Tax

H. Income Tax

Effective Tax Rate

	Three Months Ended December 31
	2018			2017
	(Dollars in millions)
(Provision) benefit for income taxes	$	7		$	(205	)
Effective tax rate		(10	)%		224	%

For the three months ended December 31, 2018, the tax (provision) benefit included a net discrete tax benefit of $24 million, of which $17 million comprised the impact of the Act. For the three months ended December 31, 2017, the tax provision included net discrete tax expense of $188 million, of which $185 million comprised the impact of the enactment of the Act.

Tax Reform

On December 22, 2017, the U.S. enacted significant changes to federal income tax law affecting the Company, including a permanent reduction of the U.S. corporate income tax rate from 35% to 21%, effective January 1, 2018, as well as a 100% dividend received deduction for foreign dividends. Although the passage of the Act reduced the U.S. tax rate and effectively created a participation exemption regime for foreign earnings, certain other aspects of the new legislation, including in particular, immediate U.S. taxation of global intangible low-taxed income (“GILTI”) earned by foreign subsidiaries, will have a negative impact on earnings. In transitioning to this participation exemption regime, Cabot was also subject, during fiscal 2018, to a one-time tax on the deemed repatriation of certain foreign earnings. A discussion of key relevant provisions of the Act and the Company’s assessment of the impact of such provisions on its consolidated financial statements is set forth below.

Uncertain Impacts of the Act

The accounting standard for income taxes (“ASC 740”) required the Company to recognize the effect of the tax law changes under the Act in the first quarter of fiscal 2018. However, due to the potential uncertainty or diversity of views in accounting for the impact of the Act, the Securities and Exchange Commission staff issued Staff Accounting Bulletin 118 (“SAB 118”) to address the application of U.S. GAAP in situations where a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Act.

In particular, SAB 118 clarified that the impact of the Act must be accounted for and reported in one of three ways: (1) by reflecting the tax effects of the Act for which the accounting is complete; (2) by reporting provisional amounts for those specific income tax effects of the Act for which the accounting is incomplete but a reasonable estimate can be determined, with such provisional amounts (or adjustments to provisional amounts) identified in the measurement period, as defined therein, being included as an adjustment to tax expense or benefit from continuing operations in the period the amounts are determined; or (3) where the income tax effects cannot be reasonably estimated, no provisional amounts should be reported and the registrant should continue to apply ASC 740 based on the provisions of the tax laws that were in effect immediately prior to the enactment of the Act. The measurement period begins in the reporting period that includes the Act’s enactment date and ends when the accounting has been completed, but not beyond one year from the enactment date.

As provided in SAB 118, final adjustments have been made to the provisional amounts recorded during fiscal 2018 and the Company has now completed its accounting for various tax impacts of the Act:

• Revaluation of Deferred Tax Assets: Due to the Company’s September 30 fiscal year-end, the reduction in the corporate tax rate to 21% effective January 1, 2018 applied on a pro-rata basis for fiscal 2018, resulting in a U.S. federal statutory tax rate of 24.53% for fiscal 2018. As of September 30, 2018, the accounting for this item was complete; no further adjustment has been made to this amount during the three months ended December 31, 2018.

• Deemed Repatriation: In general, the Act provides that U.S. shareholders of a “specified foreign corporation”, as defined in the Act, must include in U.S. taxable income its pro-rata share of certain undistributed and previously untaxed post-1986 foreign earnings and profits (“E&P”). The amount of E&P taken into account is the amount determined either as of November 2, 2017 or December 31, 2017, whichever is greater. This inclusion is offset by a deduction that results in an effective U.S. federal income tax rate of either 15.5% or 8%. The 15.5% rate applies to the “aggregate cash position”, as defined in the Act, of the specified foreign corporations and the 8% rate applies to the extent that the income inclusion exceeds the aggregate cash position. The aggregate cash position is determined as the cash position either as of September 30, 2018, or the average of September 30, 2016 and September 30, 2017, whichever is greater. Finally, the U.S. cash tax impact of the deemed repatriation inclusion may be offset by the utilization of foreign tax credits, which are pro-rated to reflect the deduction described above.

As of December 31, 2018, the accounting for this item is complete. For the three months ended December 31, 2018, the Company recorded an additional provisional tax benefit of $17 million related to the U.S. taxation of deemed foreign dividends in the transition fiscal year. This benefit may be reduced or eliminated in future legislation. If such legislation is enacted, Cabot will record the impact of the legislation in the quarter of enactment. Including the provisional tax expense of $138 million recorded for deemed repatriation during fiscal 2018, the total tax expense for this item was $121 million.

• Deferred Tax Liability on Unremitted Earnings: In addition to the deemed repatriation of foreign earnings, going forward, the Act effectively establishes a participation exemption system of taxation that, in general, provides a 100% deduction for dividends from specified foreign corporations. However, the Company is still required to provide non-U.S. withholding taxes, as well as other potential tax impacts, on undistributed earnings of non-U.S. subsidiaries that it does not consider to be indefinitely reinvested.

As of December 31, 2018, the accounting for this item is complete. For the three months ended December 31, 2018, the Company did not make any further adjustments to the provisional tax expense of $8 million recorded for deferred tax liability on unremitted earnings during fiscal 2018.

Accounting for the Global Intangible Low-Taxed Income Tax

Under the Act, Cabot is subject to a tax on GILTI beginning in fiscal 2019. In general, GILTI is a 10.5% tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The Company has adopted an accounting policy to recognize these temporary differences as period costs if and when incurred.

Uncertainties

Cabot and certain subsidiaries are under audit in a number of jurisdictions. In addition, certain statutes of limitations are scheduled to expire in the near future. It is reasonably possible that a further change in the unrecognized tax benefits may also occur within the next twelve months related to the settlement of one or more of these audits or the lapse of applicable statutes of limitations. However, an estimated range of the impact on the unrecognized tax benefits cannot be quantified at this time.

Cabot files U.S. federal and state and non-U.S. income tax returns in jurisdictions with varying statutes of limitations. The 2014 through 2017 tax years generally remain subject to examination by the IRS and various tax years from 2005 through 2017 remain subject to examination by the respective state tax authorities. In significant non-U.S. jurisdictions, various tax years from 2002 through 2017 remain subject to examination by their respective tax authorities. As of December 31, 2018, Cabot’s significant non-U.S. jurisdictions include Canada, China, France, Germany, Italy, Japan, and the Netherlands.

During the three months ended December 31, 2018, Cabot released uncertain tax positions of $7 million due to audit settlements and the expiration of statutes of limitations in various jurisdictions. During the three months ended December 31, 2017, Cabot released uncertain tax positions of $1 million due to the expirations of statutes of limitations in various jurisdictions.

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Earnings Per Share

3 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share

I. Earnings Per Share

The following tables summarize the components of the basic and diluted earnings (loss) per common share (“EPS”) computations:

	Three Months Ended December 31
	2018		2017
	(In millions, except per share amounts)
Basic EPS:
Net income (loss) attributable to Cabot    Corporation	$	69	$	(122	)
Less: Undistributed earnings allocated to    participating securities(1)		—		—
Earnings (loss) allocated to common    shareholders (numerator)	$	69	$	(122	)
Weighted average common shares and    participating securities outstanding		60.8		62.6
Less: Participating securities(1)		0.9		0.7
Adjusted weighted average common    shares (denominator)		59.9		61.9
Earnings (loss) per common share - basic:	$	1.14	$	(1.98	)
Diluted EPS:
Earnings (loss) allocated to common    shareholders	$	69	$	(122	)
Plus: Earnings (loss) allocated to    participating securities		1		—
Less: Adjusted earnings allocated to    participating securities(2)		1		—
Earnings (loss) allocated to common    shareholders (numerator)	$	69	$	(122	)
Adjusted weighted average common    shares outstanding		59.9		61.9
Effect of dilutive securities:
Common shares issuable(3)		0.2		—
Adjusted weighted average common    shares (denominator)		60.1		61.9
Earnings (loss) per common share - diluted:	$	1.14	$	(1.98	)

⁽¹⁾ Participating securities consist of shares underlying outstanding and achieved performance-based restricted stock units issued during and after fiscal 2017 and all unvested time-based restricted stock units.

Undistributed earnings are the earnings which remain after dividends declared during the period are assumed to be distributed to the common and participating shareholders. Undistributed earnings are allocated to common and participating shareholders on the same basis as dividend distributions. The calculation of undistributed earnings is as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Calculation of undistributed earnings (loss):
Net income (loss) attributable to Cabot Corporation	$	69	$	(122	)
Less: Dividends declared on common stock		20		20
Undistributed earnings (loss)	$	49	$	(142	)
Allocation of undistributed earnings (loss):
Undistributed earnings (loss) allocated to    common shareholders	$	49	$	(142	)
Undistributed earnings (loss)	$	49	$	(142	)

⁽²⁾ Undistributed earnings are adjusted for the assumed distribution of dividends to the dilutive securities, which are described in (3) below, and then reallocated to participating securities.

⁽³⁾ Represents incremental shares of common stock from the (i) assumed exercise of stock options issued under Cabot’s equity incentive plans; (ii) assumed issuance of shares to employees pursuant to the Company’s Deferred Compensation and Supplemental Retirement Plan; and (iii) assumed issuance of shares for outstanding and achieved performance-based restricted stock unit awards issued before fiscal 2017 under Cabot’s equity incentive plans using the treasury stock method. For the three months ended December 31, 2018, 687,995 incremental shares of common stock were excluded from the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive. For the three months ended December 31, 2017, 764,077incremental shares of common stock were excluded from the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive.

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Restructuring

3 Months Ended

Dec. 31, 2018

Restructuring And Related Activities [Abstract]

Restructuring

J. Restructuring

Cabot’s restructuring activities were recorded in the Consolidated Statements of Operations in the three months ended December 31, 2018 and 2017 as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Cost of sales	$	3	$	1
Selling and administrative expenses		6		—
Total	$	9	$	1

Details of all restructuring activities and the related reserves during the three months ended December 31, 2018 were as follows:

	Severance and Employee Benefits			Environmental Remediation		Asset Impairment and Accelerated Depreciation			Other			Total
	(In millions)
Reserve at September 30, 2018	$	1		$	4	$	—		$	—		$	5
Charges		7			—		1			1			9
Costs charged against assets / (liabilities)		—			1		(1	)		—			—
Cash received (paid)		(1	)		—		—			(1	)		(2	)
Reserve at December 31, 2018	$	7		$	5	$	—		$	—		$	12

Cabot’s severance and employee benefit reserves and other closure related reserves are reflected in Accounts payable and accrued liabilities on the Company’s Consolidated Balance Sheets. Cabot’s environmental remediation reserves related to restructuring activities are reflected in Other liabilities on the Company’s Consolidated Balance Sheets.

Purification Solutions Transformation Plan

In December 2018, the Company began implementation, subject to local consultation requirements, of a transformation plan to improve the long-term performance of the Purification Solutions segment. The purpose of the plan is to focus the business’s product portfolio, optimize its manufacturing assets, and streamline its organizational structure to support the new focus. The plan includes a proposed workforce restructuring, which is subject to local consultation requirements. The Company recorded charges of approximately $8 million related to this plan in the three months ended December 31, 2018, comprised of approximately $7 million of severance costs and $1 million of professional fees. Cabot paid approximately $1 million related to these activities in the three months ended December 31, 2018 and expects to pay approximately $7 million in the remainder of fiscal 2019 and thereafter, subject to the results of the consultation processes in certain locations. As of December 31, 2018, Cabot had $7 million of accrued severance charges in the Consolidated Balance Sheets related to these actions.

Marshall, Texas Plan

In October 2017, Cabot indefinitely idled three of the seven production units at its activated carbon manufacturing facility in Marshall, Texas. Total costs recorded related to this plan, which was completed in fiscal 2018, were $1 million, comprised of approximately $1 million of non-cash accelerated depreciation costs and less than $1 million of severance costs.

2016 Plan

In October 2015, in response to challenging macroeconomic conditions, the Company announced its intention to restructure its operations subject to local consultation requirements and processes in certain locations.

Most of the charges and cash outlays related to this plan were recorded in fiscal 2016. The Company recorded pre-tax cash charges related to this plan of less than $1 million in the first three months of both fiscal 2019 and 2018. No further charges are expected related to this plan.

Other Actions

Cabot recorded approximately $1 million of severance charges in the first quarter of fiscal 2019, of which less than $1 million was paid during the quarter. The balance is expected to be paid during the remainder of fiscal 2019. Additionally, Cabot recorded less than $1 million of accelerated depreciation charges in the first quarter of fiscal 2019 and expects to record approximately $1 million of additional accelerated depreciation in the remainder of fiscal 2019 and approximately $1 million thereafter.

Cabot recorded less than $1 million of severance charges in the first quarter of fiscal 2018, nearly all of which was paid in that quarter.

Additionally, in previous years, the Company entered into other various restructuring actions that have been substantially completed. As of December 31, 2018, Cabot had approximately $5 million of accrued environmental and closure costs in the Consolidated Balance Sheets related to these actions which it expects to pay in the remainder of fiscal 2019 and thereafter.

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Financial Instruments and Fair Value Measurements

3 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Financial Instruments and Fair Value Measurements

K. Financial Instruments and Fair Value Measurements

The FASB authoritative guidance on fair value measurements defines fair value, provides a framework for measuring fair value, and requires certain disclosures about fair value measurements. The required disclosures focus on the inputs used to measure fair value. The guidance establishes the following hierarchy for categorizing these inputs:

Level 1	—	Quoted market prices in active markets for identical assets or liabilities
Level 2	—	Significant other observable inputs (e.g., quoted prices for similar items in active markets, quoted prices for identical or similar items in markets that are not active, inputs other than quoted prices that are observable such as interest rate and yield curves, and market-corroborated inputs)
Level 3	—	Significant unobservable inputs

There were no transfers of financial assets or liabilities measured at fair value between Level 1 and Level 2 and there were no Level 3 investments during the first three months of either fiscal 2019 or 2018.

At December 31, 2018 and September 30, 2018, Cabot had derivatives relating to foreign currency risks carried at fair value. At December 31, 2018 and September 30, 2018, the fair value of these derivatives was a net liability of $10 million and $18 million, respectively, and was included in Prepaid expenses and other current assets and Other liabilities on the Consolidated Balance Sheets. These derivatives are classified as Level 2 instruments within the fair value hierarchy as the fair value determination was based on observable inputs.

At both December 31, 2018 and September 30, 2018, the fair value of guaranteed investment contracts, included in Other assets on the Consolidated Balance Sheets, was $11 million. Guaranteed investment contracts were classified as Level 2 instruments within the fair value hierarchy as the fair value determination was based on other observable inputs.

At December 31, 2018 and September 30, 2018, the fair values of cash and cash equivalents, accounts and notes receivable, accounts payable and accrued liabilities, and short-term borrowings and variable rate debt approximated their carrying values due to the short-term nature of these instruments. The carrying value and fair value of the long-term fixed rate debt were $669 million and $681 million, respectively, as of December 31, 2018, and $747 million and $742 million, respectively, as of September 30, 2018. The fair values of Cabot’s fixed rate long-term debt are estimated based on comparable quoted market prices at the respective period ends. The carrying amounts of Cabot’s floating rate long-term debt and capital lease obligations approximate their fair values. All such measurements are based on observable inputs and are classified as Level 2 within the fair value hierarchy. The valuation technique used is the discounted cash flow model.

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Derivatives

3 Months Ended

Dec. 31, 2018

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivatives

L. Derivatives

Foreign Currency Risk Management

Cabot’s international operations are subject to certain risks, including currency exchange rate fluctuations and government actions. Cabot endeavors to match the currency in which debt is issued to the currency of the Company’s major, stable cash receipts. In some situations, Cabot has issued debt denominated in U.S. dollars and then entered into cross-currency swaps that exchange the dollar principal and interest payments into Euro-denominated principal and interest payments.

Additionally, the Company has foreign currency exposure arising from its net investments in foreign operations. Cabot may enter into cross-currency swaps to mitigate the impact of currency rate changes on the Company’s net investments.

The Company also has foreign currency exposure arising from the denomination of monetary assets and liabilities in foreign currencies other than the functional currency of a given subsidiary as well as the risk that currency fluctuations could affect the dollar value of future cash flows generated in foreign currencies. Accordingly, Cabot uses short-term forward contracts to minimize the exposure to foreign currency risk. In certain situations where the Company has forecasted purchases under a long-term commitment or forecasted sales denominated in a foreign currency, Cabot may enter into appropriate financial instruments in accordance with the Company’s risk management policy to hedge future cash flow exposures.

The following table provides details of the derivatives held as of December 31, 2018 and September 30, 2018 to manage foreign currency risk.

		Notional Amount
Description	Borrowing	December 31, 2018	September 30, 2018	Hedge Designation
Cross-Currency Swaps	3.4% Notes	USD 250 million swapped to EUR 223 million	USD 250 million swapped to EUR 223 million	Net investment
Forward Foreign Currency Contracts (1)	N/A	USD 14 million	USD 18 million	No designation

⁽¹⁾ Cabot’s forward foreign exchange contracts are denominated in the Canadian dollar, Indonesian rupiah and Czech koruna.

Accounting for Derivative Instruments and Hedging Activities

The Company determines the fair value of financial instruments using quoted market prices whenever available. When quoted market prices are not available for various types of financial instruments (such as forwards, options and swaps), the Company uses standard models with market-based inputs, which take into account the present value of estimated future cash flows and the ability of Cabot or the financial counterparty to perform. For interest rate and cross-currency swaps, the significant inputs to these models are interest rate curves for discounting future cash flows and are adjusted for credit risk. For forward foreign currency contracts, the significant inputs are interest rate curves for discounting future cash flows, and exchange rate curves of the foreign currency for translating future cash flows.

Fair Value Hedge

For derivative instruments that are designated and qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting gain or loss on the hedged item attributable to the hedged risk are recognized in current period earnings.

Cash Flow Hedge

For derivative instruments that are designated and qualify as cash flow hedges, the effective portion of the gain or loss on the derivative is recorded in AOCI and reclassified to earnings in the same period or periods during which the hedged transaction affects earnings. Gains and losses on the derivative representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness are recognized in current period earnings.

Net Investment Hedge

For net investment hedges, changes in the fair value of the effective portion of the derivatives’ gains or losses are reported as foreign currency translation gains or losses in AOCI while changes in the ineffective portion are reported in earnings. Effectiveness is assessed using the method based on changes in spot exchange rates. The gains or losses on derivative instruments reported in AOCI are reclassified to earnings in the period in which earnings are affected by the underlying item, such as a disposal or substantial liquidations of the entities being hedged.

The Company has cross-currency swaps with a notional amount of $250 million, which are designated as hedges of its net investments in certain Euro-denominated subsidiaries. Cash settlements occur semi-annually on March 15^th and September 15^th for fixed rate interest payments and a cash exchange of the notional currency amount will occur at the end of the term in 2026. As of December 31, 2018, the fair value of these swaps was a net liability of $10 million and was included in Prepaid expenses and other current assets and Other liabilities and the cumulative loss of $7 million was included in AOCI on the Consolidated Balance Sheets. As of September 30, 2018, the fair value of these swaps was a net liability of $18 million and was included in Prepaid expenses and other current assets and Other Liabilities and the cumulative loss of $14 million was included in AOCI on the Consolidated Balance Sheets.

The following tables summarize the impact of the cross-currency swaps to AOCI and the Consolidated Statements of Operations:

	Three Months Ended December 31
	2018		2017			2018			2017			2018		2017
Description	Gain/(Loss) Recognized in AOCI					(Gain)/Loss Reclassified from AOCI into Interest Expense in the Consolidated Statements of Operations						(Gain)/Loss Recognized in Interest Expense in the Consolidated Statements of Operations (Amount Excluded from Effectiveness Testing)
	(In millions)
Cross-currency swaps	$	8	$	(5	)	$	(1	)	$	(1	)	$	—	$	—

Other Derivative Instruments

From time to time, the Company may enter into certain derivative instruments that may not be designated as hedges for accounting purposes, which may include cross-currency swaps, foreign currency forward contracts and commodity derivatives. For cross-currency swaps and foreign currency forward contracts not designated as hedges, the Company uses standard models with market-based inputs. The significant inputs to these models are interest rate curves for discounting future cash flows, and exchange rate curves of the foreign currency for translating future cash flows. In determining the fair value of the commodity derivatives, the significant inputs to valuation models are quoted market prices of similar instruments in active markets. Although these derivatives do not qualify for hedge accounting, Cabot believes that such instruments are closely correlated with the underlying exposure, thus managing the associated risk. The gains or losses from changes in the fair value of derivative instruments that are not accounted for as hedges are recognized in current period earnings.

At December 31, 2018, the fair value of derivative instruments not designated as hedges were immaterial and were presented in Accounts payable and accrued liabilities, and Prepaid expenses and other current assets on the Consolidated Balance Sheets. At September 30, 2018 the fair value of derivative instruments not designated as hedges were immaterial and were presented in Accounts payable and accrued liabilities on the Consolidated Balance Sheets.

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Hyperinflationary Economies

3 Months Ended

Dec. 31, 2018

Equity Method Investments And Joint Ventures [Abstract]

Hyperinflationary Economies

M. Hyperinflationary Economies

Argentina

Cabot owns 100% of a carbon black operating entity in Argentina. Effective July 1, 2018, the operating entity was considered to be functioning in a highly inflationary economy and began using Cabot’s reporting currency, the U.S. dollar, as its functional currency. Since the conversion, all impacts of foreign exchange changes between the reporting currency and Argentine peso are reflected in earnings in the Consolidated Statements of Operations.

The Company’s income from operations has not been significantly impacted from this change because the operating entity’s sales and a portion of its raw material purchases were already denominated in U.S. dollars. The operating entity’s net revenue represented approximately 2% of Cabot’s total net revenue for the three months ended December 31, 2018.

The operating entity’s assets and liabilities held in local currency, which consist primarily of cash and cash equivalents, inventories, property, plant and equipment and accounts payable and accrued liabilities, made up less than 2% of Cabot’s total assets and total liabilities as of both December 31, 2018 and September 30, 2018. Changes in the Argentine peso exchange rate will result in foreign currency exchange gains or losses on the operating entity’s peso-denominated monetary assets and liabilities. The Company recorded a $1 million net loss within Other (income) expense in the Consolidated Statements of Operations for the three months ended December 31, 2018, which reflects the remeasurement of the operating entity’s net monetary liabilities denominated in Argentine peso using an exchange rate of 37.70 Argentine peso to the U.S. dollar at December 31, 2018.

The Company will continue to monitor the developments in Argentina and their potential impact on the operating entity’s operations or carrying value.

Venezuela

Cabot owns 49% of a carbon black operating affiliate in Venezuela, which is accounted for as an equity affiliate, through wholly-owned subsidiaries that carry the investment and receive its dividends. As of December 31, 2018, these subsidiaries carried the operating affiliate investment of $12 million.

During the three months ended December 31, 2018 and 2017, the Company received dividends in the amounts of $1 million and $2 million, respectively, which were paid in U.S. dollars.

A significant portion of the Company’s operating affiliate’s sales are exports denominated in U.S. dollars. The Venezuelan government mandates that a certain percentage of the dollars collected from these sales be converted into bolivars. The exchange rate made available to the Company as of December 31, 2018 and September 30, 2018 was 564 and 62 bolivars soberano to the U.S. dollar, respectively. Due to a reduced level of export sales in recent periods, the exchange rate devaluation during the first three months of fiscal 2019 had an immaterial impact on the Company’s results.

While the operating entity has historically been profitable, it has not been operational in recent months due to a lack of available raw materials. The Company continues to closely monitor developments in Venezuela and their potential impact on the recoverability of its equity affiliate investment. Any future change in the exchange rate made available to the Company could cause the Company to change the exchange rate it uses and result in gains or losses on the bolivar-denominated assets held by its operating affiliate.

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Financial Information by Segment

3 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Financial Information by Segment

N. Financial Information by Segment

The Company identifies a business as an operating segment if: (i) it engages in business activities from which it may earn revenues and incur expenses; (ii) its operating results are regularly reviewed by the Chief Operating Decision Maker (“CODM”), who is Cabot’s President and Chief Executive Officer, to make decisions about resources to be allocated to the segment and assess its performance; and (iii) it has available discrete financial information. The Company has determined that all of its businesses are operating segments. The CODM reviews financial information at the operating segment level to allocate resources and to assess the operating results and financial performance for each operating segment. Operating segments are aggregated into a reportable segment if the operating segments are determined to have similar economic characteristics and if the operating segments are similar in the following areas: (i) nature of products and services; (ii) nature of production processes; (iii) type or class of customer for their products and services; (iv) methods used to distribute the products or provide services; and (v) if applicable, the nature of the regulatory environment.

The Company has four reportable segments: Reinforcement Materials, Performance Chemicals, Purification Solutions and Specialty Fluids.

The Reinforcement Materials segment represents the rubber blacks and elastomer composites product lines.

The Performance Chemicals segment combines the specialty carbons, fumed metal oxides and aerogel product lines into the Performance Additives business, and combines the specialty compounds and inkjet colorants product lines into the Formulated Solutions business. These businesses are similar in terms of economic characteristics, nature of products, processes, customer class and product distribution methods, and, therefore, have been aggregated into one reportable segment. The net sales from each of these businesses for the three months ended December 31, 2018 and 2017 were as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Performance Additives	$	167	$	159
Formulated Solutions		64		70
Performance Chemicals	$	231	$	229

The Purification Solutions segment represents the Company’s activated carbon business and the Specialty Fluids segment includes cesium formate oil and gas drilling fluids and high-purity fine cesium chemicals product lines.

Income (loss) from continuing operations before income taxes (“Segment EBIT”) is presented for each reportable segment in the table below. Segment EBIT excludes certain items, meaning items management does not consider representative of on-going operating segment results. In addition, Segment EBIT includes Equity in earnings of affiliated companies, net of tax, the full operating results of a contractual joint venture in Purification Solutions, royalties, Net income attributable to noncontrolling interests, net of tax, and discounting charges for certain Notes receivable, but excludes Interest expense, foreign currency transaction gains and losses, interest income, dividend income, unearned revenue, general unallocated expense and unallocated corporate costs.

Financial information by reportable segment is as follows:

	Reinforcement Materials		Performance Chemicals		Purification Solutions			Specialty Fluids			Segment Total		Unallocated and Other(1)			Consolidated Total
	(In millions)
Three Months Ended December 31, 2018
Revenues from external customers(2)	$	457	$	231	$	65		$	19		$	772	$	49		$	821
Income (loss) from continuing operations    before income taxes(3)	$	62	$	36	$	(3	)	$	10		$	105	$	(35	)	$	70
Three Months Ended December 31, 2017
Revenues from external customers(2)	$	387	$	229	$	70		$	6		$	692	$	28		$	720
Income (loss) from continuing operations    before income taxes(3)	$	62	$	47	$	6		$	(2	)	$	113	$	(21	)	$	92

⁽¹⁾ Unallocated and Other includes certain items and eliminations necessary to reflect management’s reporting of operating segment results. These items are reflective of the segment reporting presented to the CODM.

⁽²⁾ Consolidated Total Revenues from external customers reconciles to Net sales and other operating revenues on the Consolidated Statements of Operations.Revenues from external customers that are categorized as Unallocated and Other reflects royalties, external shipping and handling fees, the impact of unearned revenue, the removal of 100% of the sales of an equity method affiliate, discounting charges for certain Notes receivable, and by-product revenue.Details are provided in the table below:

	Three Months Ended December 31
	2018			2017
	(In millions)
Royalties, the impact of unearned revenue, the removal of 100% of    the sales of an equity method affiliate and discounting charges for    certain notes receivable	$	(3	)	$	1
Shipping and handling fees		32			27
By-product sales(a)		20			—
Total	$	49		$	28

^(a) Beginning in fiscal 2019 as part of the adoption of the new accounting standard, Revenue from Contracts with Customers, the Company includes revenue from by-products produced in manufacturing operations in Net sales and other operating revenues, which in prior years was included as a reduction in Cost of sales.

⁽³⁾ Consolidated Total Income (loss) from continuing operations before income taxes reconciles to Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies on the Consolidated Statements of Operations.Income (loss) from continuing operations before income taxes that are categorized as Unallocated and Other includes:

	Three Months Ended December 31
	2018			2017
	(In millions)
Interest expense	$	(15	)	$	(13	)
Certain items(a)
Global restructuring activities		(9	)		(1	)
Legal and environmental matters and reserves		—			(1	)
Gains (losses) on sale of investments		—			10
Acquisition and integration-related charges		(3	)		—
Other		2			(1	)
Total certain items, pre-tax		(10	)		7
Unallocated corporate costs(b)		(12	)		(14	)
General unallocated income (expense)(c)		2			—
Less: Equity in earnings of affiliated companies, net of tax(d)		—			1
Total	$	(35	)	$	(21	)

^(a) Certain items areitems of expense and income that management does not consider representative of the Company’s fundamental on-going segment results and they are, therefore, excluded from Segment EBIT.

^(b) Unallocated corporate costs are costs that are not controlled by the segments and primarily benefit corporate interests.

^(c) General unallocated income (expense) consists of gains (losses) arising from foreign currency transactions, net of other foreign currency risk management activities, the profit or loss related to the corporate adjustment for unearned revenue, and the impact of including the full operating results of a contractual joint venture in Purification Solutions Segment EBIT.

^(d) Equity in earnings of affiliated companies, net of tax, is included in Segment EBIT and is removed in Unallocated and other to reconcile to Income (loss) from operations before income taxes and equity in earnings from affiliated companies.

The Company’s segments operate globally. In addition to presenting Revenue from external customers by reportable segment, the following table further disaggregates Revenue from external customers by geographic region.

	Three Months Ended December 31, 2018
	Reinforcement Materials		Performance Chemicals		Purification Solutions		Specialty Fluids		Consolidated Total
	(In millions)
Americas	$	167	$	72	$	29	$	2	$	270
Asia Pacific		202		85		9		1		297
Europe, Middle East and Africa		88		74		27		16		205
Segment revenues from external customers		457		231		65		19		772
Unallocated and other										49
Net sales and other operating revenues									$	821

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Subsequent Event

3 Months Ended

Dec. 31, 2018

Subsequent Events [Abstract]

Subsequent Event

O. Subsequent Event

On January 30, 2019, the Company entered into a Stock Purchase Agreement to sell its Specialty Fluids business to Sinomine (Hong Kong) Rare Metals Resources Co. Limited, a wholly owned subsidiary of Sinomine Resource Group Co., Ltd. (“Sinomine”), on a cash-free and debt-free basis in a transaction valued at $135 million. The purchase price consists of $130 million to be paid at closing, subject to customary closing adjustments (including a customary working capital adjustment), and additional cash royalties of up to $5 million for lithium products, payable over a ten-year period.

The transaction is expected to close in the third quarter of fiscal 2019 and is subject to customary closing conditions, including, among other things, the receipt of certain regulatory approvals and notices with respect to the People’s Republic of China and Canada and the consent from the shareholders of Sinomine to the entry into the Agreement and the consummation of the transactions contemplated thereby.

Based on the carrying value of the Specialty Fluids business as of December 31, 2018 and an estimate of the total cash proceeds from the sale including customary closing adjustments, the Company estimates a non-cash impairment charge of approximately $25 million to be recorded in the second quarter of fiscal 2019 related to the assets held for sale of this business.

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Significant Accounting Policies (Policies)

3 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Revenue Recognition

Revenue Recognition

Cabot recognizes revenue when its customers obtain control of promised goods or services. The revenue recognized is the amount of consideration which the Company expects to receive in exchange for those goods or services. Cabot derives the majority of its revenues from contracts for the sale of products from its Reinforcement Materials, Performance Chemicals and Purification Solutions segments. The Company’s contracts with customers are generally for products only and do not include other performance obligations. Generally, Cabot considers purchase orders, which in some cases are governed by master supply agreements, to be contracts with customers. The transaction price as specified on the purchase order or sales contract is considered the standalone selling price for each distinct product. To determine the transaction price at the time when revenue is recognized, the Company evaluates whether the price is subject to adjustments, such as for returns, discounts or volume rebates, which are stated in the customer contract, to determine the net consideration to which the Company expects to be entitled. Revenue from product sales is recognized based on a point in time model when control of the product is transferred to the customer, which typically occurs upon shipment or delivery of the product to the customer and title, risk and rewards of ownership have passed to the customer. Payment terms typically range from zero to ninety days.

Shipping and handling activities that occur after the transfer of control to the customer are billed to customers and are recorded as sales revenue, as the Company considers these to be fulfillment costs. Shipping and handling costs are expensed in the period incurred and included in Cost of sales within the Consolidated Statement of Operations. Taxes collected on sales to customers are excluded from the transaction price.

The Company generally provides a warranty that its products will substantially conform to the identified specifications. The Company’s liability typically is limited to either a credit equal to the purchase price or replacement of the non-conforming product. Returns under warranty have historically been immaterial.

Revenue in the Specialty Fluids segment arises primarily from the rental of cesium formate. This revenue is recognized throughout the rental period based on the contracted rental terms. During the three months ended December 31, 2018, the Company recognized revenue of $8 million related to the rental of cesium formate. Customers are also billed and revenue is recognized, typically at the end of the rental period, for cesium formate product that is not returned. The Company also generates revenues from cesium formate sold outside of the rental process and from the sale of fine cesium chemicals. This revenue is recognized when control of the product transfers to the customer, which is typically upon delivery of the product.

As permitted by the revenue recognition standard, Revenue from Contracts with Customers, when the period of time between the transfer of control of the goods and the time the customer pays for the goods is one year or less, the Company does not consider there to be a significant financing component associated with the contract.

Intangible Assets and Goodwill Impairment

Intangible Assets and Goodwill Impairment

The Company records tangible and intangible assets acquired and liabilities assumed in business combinations under the acquisition method of accounting. Amounts paid for an acquisition are allocated to the assets acquired and liabilities assumed based on their fair values at the date of acquisition. The Company uses assumptions and estimates in determining the fair value of assets acquired and liabilities assumed in a business combination. The determination of the fair value of intangible assets requires the use of significant judgment with regard to assumptions used in the valuation model. The Company estimates the fair value of identifiable acquisition-related intangible assets principally based on projections of cash flows that will arise from these assets. The projected cash flows are discounted to determine the fair value of the assets at the dates of acquisition.

Definite-lived intangible assets, which are comprised of trademarks, customer relationships and developed technologies, are amortized over their estimated useful lives and are reviewed for impairment when indication of potential impairment exists, such as a significant reduction in cash flows associated with the assets.

Goodwill is comprised of the purchase price of business acquisitions in excess of the fair value assigned to the net tangible and identifiable intangible assets acquired. Goodwill is not amortized, but is reviewed for impairment annually as of May 31, or when events or changes in the business environment indicate that the carrying value of the reporting unit may exceed its fair value. A reporting unit, for the purpose of the impairment test, is at or below the operating segment level, and constitutes a business for which discrete financial information is available and regularly reviewed by segment management. Reinforcement Materials, and the fumed metal oxides and specialty compounds product lines within Performance Chemicals, which are considered separate reporting units, carry the Company’s goodwill balances as of December 31, 2018.

For the purpose of the goodwill impairment test, the Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If an initial qualitative assessment identifies that it is more likely than not that the carrying value of a reporting unit exceeds its estimated fair value, an additional quantitative evaluation is performed. Alternatively, the Company may elect to proceed directly to the quantitative goodwill impairment test. If based on the quantitative evaluation the fair value of the reporting unit is less than its carrying amount, a goodwill impairment loss would result. The goodwill impairment loss would be the amount by which the carrying value of the reporting unit, including goodwill, exceeds its fair value, limited to the total amount of goodwill allocated to that reporting unit. The fair value of a reporting unit is based on discounted estimated future cash flows. The fair value is also benchmarked against a market approach using the guideline public companies method. The assumptions used to estimate fair value include management’s best estimates of future growth rates, operating cash flows, capital expenditures and discount rates over an estimate of the remaining operating period at the reporting unit level. Based on the Company’s most recent annual goodwill impairment test performed as of May 31, 2018, the fair values of the Reinforcement Materials, Fumed Metal Oxides and Specialty Compounds reporting units were substantially in excess of their carrying values. No events occurred subsequent to the last impairment evaluation that would suggest that it is more likely than not that the carrying values of any of the Company’s reporting units exceeded their fair value.

Long-Lived Assets Impairment

Long-lived Assets Impairment

The Company’s long-lived assets primarily include property, plant and equipment, intangible assets, long-term investments and assets held for rent. The carrying values of long-lived assets are reviewed for impairment whenever events or changes in business circumstances indicate that the carrying amount of an asset may not be recoverable.

To test for impairment of assets, the Company generally uses a probability-weighted estimate of the future undiscounted net cash flows of the assets over their remaining lives to determine if the value of the asset is recoverable. Long-lived assets are grouped with other assets and liabilities at the lowest level for which independent identifiable cash flows are determinable.

An asset impairment is recognized when the carrying value of the asset is not recoverable based on the analysis described above, in which case the asset is written down to its fair value. If the asset does not have a readily determinable market value, a discounted cash flow model may be used to determine the fair value of the asset. In circumstances when an asset does not have separately identifiable cash flows, an impairment charge is recorded when the Company no longer intends to use the asset.

The Company continues to pursue strategic options for its Purification Solutions business. Depending on the actions taken, there could be a negative impact on the fair value of the Purification Solution reporting unit, which may lead to impairment.

Property, Plant and Equipment

Property, Plant and Equipment

Property, plant and equipment are recorded at cost. Depreciation of property, plant and equipment is calculated using the straight-line method over the estimated useful lives of the related assets. The depreciable lives for buildings, machinery and equipment, and other fixed assets are between twenty and twenty-five years, ten and twenty-five years, and three and twenty-five years, respectively. The cost and accumulated depreciation for property, plant and equipment sold, retired, or otherwise disposed of are removed from the Consolidated Balance Sheets and resulting gains or losses are included in earnings in the Consolidated Statements of Operations. Expenditures for repairs and maintenance are charged to expenses as incurred. Expenditures for major renewals and betterments, which significantly extend the useful lives of existing plant and equipment, are capitalized and depreciated.

Income Tax in Interim Periods

Income Tax in Interim Periods

The Company records its tax provision or benefit on an interim basis using an estimated annual effective tax rate. This rate is applied to the current period ordinary income or loss to determine the income tax provision or benefit allocated to the interim period. Losses from jurisdictions for which no benefit can be recognized and the income tax effects of unusual or infrequent items are excluded from the estimated annual effective tax rate and are recognized in the impacted interim period.

Valuation allowances are provided against the future tax benefits that arise from the deferred tax assets in jurisdictions for which no benefit can be recognized. The estimated annual effective tax rate may be significantly impacted by nondeductible expenses and the Company’s projected earnings mix by tax jurisdiction. Adjustments to the estimated annual effective income tax rate are recognized in the period when such estimates are revised.

Inventory Valuation

Inventory Valuation

Inventories are stated at the lower of cost or market. The cost of Specialty Fluids inventories that are classified as assets held for rent is determined using the average cost method. The cost of all other inventories is determined using the FIFO method.

Cabot periodically reviews inventory for both potential obsolescence and potential declines in anticipated selling prices. In this review, the Company makes assumptions about the future demand for and market value of the inventory, and based on these assumptions estimates the amount of any obsolete, unmarketable, slow moving, or overvalued inventory. Cabot writes down the value of these inventories by an amount equal to the difference between the cost of the inventory and its estimated net realizable value.

Pensions and Other Postretirement Benefits

Pensions and Other Postretirement Benefits

The Company recognizes the funded status of defined benefit pension and other postretirement benefit plans as an asset or liability. This amount is defined as the difference between the fair value of plan assets and the benefit obligation. The Company is required to recognize as a component of Other comprehensive income (loss), net of tax, the actuarial gains/losses and prior service costs/credits that arise but were not previously required to be recognized as components of net periodic benefit cost. Other comprehensive income (loss) is adjusted as these amounts are later recognized in income as components of net periodic benefit cost.

Redeemable Preferred Stock

Redeemable Preferred Stock

In November 2013, the Company purchased all of its joint venture partner’s common stock in the former NHUMO, S.A. de C.V. (“NHUMO”) joint venture. At the close of the transaction, NHUMO issued redeemable preferred stock to the joint venture partner with a repurchase value of $25 million and a fixed dividend rate of 6% per annum. In November 2018, the preferred stock was repurchased for $25 million and a final dividend payment of approximately $1.4 million was made. The preferred stock was accounted for as a financing obligation and was separately presented in the Consolidated Balance Sheets as a current liability as of September 30, 2018.

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

Accumulated other comprehensive income (loss) (“AOCI”), which is included as a component of stockholders’ equity, includes unrealized gains or losses on available-for-sale marketable securities and derivative instruments, currency translation adjustments in foreign subsidiaries, translation adjustments on foreign equity securities and minimum pension liability adjustments.

Recently Adopted Accounting Standards

Recently Adopted Accounting Standards

In May 2014, the FASB issued a new standard, Revenue from Contracts with Customers, that amended the existing accounting standards for revenue recognition. The standard requires entities to recognize revenue when they transfer promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. This standard is applicable for fiscal years beginning after December 15, 2017. The Company adopted this standard on October 1, 2018 and applied a modified retrospective approach. The comparative information has not been restated and continues to be reported under the accounting standards in effect during those periods, as discussed in the Company’s 2018 10-K.

The adoption of this standard did not have an impact on how the Company recognizes revenue. As such, an adjustment to opening retained earnings was not required as a result of adopting this new standard. The Company implemented the updates that were necessary to its revenue recognition policy, internal controls, processes and financial statement disclosures as part of this adoption. The updated disclosures are reflected under the heading “Revenue Recognition” within Note B and the Company’s disaggregated revenue is reflected within Note N.

In addition, as part of an assessment performed in connection with adopting this standard, the Company reviewed its classification of by-product sales, which consist of sales generated from the production of steam or electricity from the Company's energy centers primarily from its carbon black manufacturing sites and sales of hydrochloric acid generated from the production of fumed silica. Historically, the Company presented by-product sales as a reduction of Cost of sales within the Consolidated Statement of Operations. However, upon further evaluation of these sales in connection with the implementation of this standard, the Company determined that it is appropriate to present by-product sales as Net sales and other operating revenues. Effective October 1, 2018, these sales are now included within Net sales and other operating revenues in the Consolidated Statement of Operations. This change did not result in a cumulative adjustment to opening retained earnings as it is a classification change within the Consolidated Statement of Operations. If the Company had continued to classify by-product sales within Cost of sales, there would have been a decrease to Net sales and other operating revenues and Cost of sales of $20 million for the three months ended December 31, 2018.

In August 2016, the FASB issued final amendments to clarify how entities should classify certain cash receipts and cash payments on the statement of cash flows, such as distributions received from equity method investees, proceeds from the settlement of insurance claims, and proceeds from the settlement of corporate-owned life insurance policies. The new standard is effective for fiscal years beginning after December 15, 2017, including interim periods within those years, and early adoption is permitted. The Company adopted this standard on October 1, 2018. The adoption of this standard did not have a material impact to the Company’s consolidated financial statements.

In March 2017, the FASB issued a new standard that amends the requirements on the presentation of net periodic pension and postretirement benefit costs. The new standard requires the service cost component to be presented with other employee compensation costs. The other components will be reported separately outside of operations. Only the service cost component will be eligible for capitalization. Entities are required to use a retrospective transition method to adopt the requirement for separate income statement presentation of the service cost and other components, and a prospective transition method to adopt the requirement to limit the capitalization of benefit cost to the service component. The Company adopted the standard on October 1, 2018 and used a retrospective transition method to reclassify net periodic benefit cost, other than the service component, from Cost of sales, Selling and administrative expenses and Research and technical expenses to Other income (expense) in the Consolidated Statements of Operations for the prior periods presented. In accordance with the standard, the Company utilized prior period footnote disclosures as a practical expedient to apply these retrospective presentations, which is shown in the table below:

Consolidated Statements of Operations	Three Months Ended December 31
	2017
	As Originally Reported		Effect of Change			As Adjusted
	(In millions, except per share amounts)
Cost of sales	$	542	$	2		$	544
Gross profit	$	178	$	(2	)	$	176
Selling and administrative expenses	$	69	$	1		$	70
Research and technical expenses	$	15	$	—		$	15
Income (loss) from operations	$	94	$	(3	)	$	91
Other income (expense)	$	8	$	3		$	11

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In February 2016, the FASB issued a new standard for the accounting for leases. This new standard requires lessees to recognize assets and liabilities for most leases, but recognize expenses on their income statements in a manner that is similar to the current accounting treatment for leases. The standard is applicable for fiscal years beginning after December 15, 2018 and for interim periods within those years, and early adoption is permitted. The Company expects to adopt the standard on October 1, 2019. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements. The Company has established a project plan and implementation team which will analyze the current portfolio of leases to determine the impact of adopting this new standard. The implementation team will also be responsible for evaluating and designing the necessary changes to the Company’s business processes, lease policies, systems and internal controls to support recognition and disclosure under the new guidance.

In February 2018, the FASB issued a new standard that allows entities to reclassify from AOCI to Retained earnings stranded tax effects resulting from changes made as a result of the Tax Cuts and Jobs Act of 2017 (the “Act”). The amendments in this new standard also require certain disclosures about stranded tax effects. The new standard is effective for all entities for fiscal years beginning after December 15, 2018, including interim periods within those years, and early adoption is permitted. The Company is evaluating this standard and the timing of its adoption. The adoption of this standard is not expected to materially impact the Company’s consolidated financial statements.

In August 2018, the FASB issued a new standard to align the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The updated guidance also requires an entity to expense the capitalized implementation costs of a cloud computing arrangement that is a service contract over the term of the arrangement and includes expanded disclosure requirements for such costs. This guidance is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted, and the guidance may be applied either retrospectively or prospectively. The Company is evaluating this standard and the timing of its adoption. The Company does not expect the adoption of this guidance to have a material impact on its consolidated financial statements and related disclosures.

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Significant Accounting Policies (Tables)

3 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of Change Retrospectively to Prior Periods Financial Statement Line Items

The Company adopted the standard on October 1, 2018 and used a retrospective transition method to reclassify net periodic benefit cost, other than the service component, from Cost of sales, Selling and administrative expenses and Research and technical expenses to Other income (expense) in the Consolidated Statements of Operations for the prior periods presented. In accordance with the standard, the Company utilized prior period footnote disclosures as a practical expedient to apply these retrospective presentations, which is shown in the table below:

Consolidated Statements of Operations	Three Months Ended December 31
	2017
	As Originally Reported		Effect of Change			As Adjusted
	(In millions, except per share amounts)
Cost of sales	$	542	$	2		$	544
Gross profit	$	178	$	(2	)	$	176
Selling and administrative expenses	$	69	$	1		$	70
Research and technical expenses	$	15	$	—		$	15
Income (loss) from operations	$	94	$	(3	)	$	91
Other income (expense)	$	8	$	3		$	11

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Acquisitions (Tables)

3 Months Ended

Dec. 31, 2018

Business Combinations [Abstract]

Preliminary Purchase Price Estimates Fair Value of Assets Acquired and Liabilities Assumed

The allocation of the purchase price set forth below was based on estimates of the fair value of assets acquired and liabilities assumed.

	(In millions)
Assets
Cash	$	1
Accounts receivable		5
Inventories		3
Property, plant and equipment		7
Intangible assets		29
Goodwill		33
Total assets acquired		78
Liabilities
Current liabilities		(3	)
Deferred tax liabilities		(10	)
Total liabilities assumed		(13	)
Cash consideration paid	$	65

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Employee Benefit Plans (Tables)

3 Months Ended

Dec. 31, 2018

Compensation And Retirement Disclosure [Abstract]

Net Periodic Defined Benefit Pension and Other Postretirement Benefit Costs

Net periodic defined benefit pension and other postretirement benefit costs include the following:

	Three Months Ended December 31
	2018						2017						2018				2017
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.		Foreign		U.S.			Foreign
	(In millions)
Service cost	$	—		$	2		$	—		$	2		$	—	$	—	$	—		$	—
Interest cost		1			2			1			2			—		—		—			—
Expected return on plan assets		(2	)		(4	)		(2	)		(4	)		—		—		—			—
Amortization of prior service credit		—			—			—			—			—		—		(1	)		—
Amortization of actuarial loss		—			1			—			1			—		—		—			—
Settlement and curtailment gain		—			(6	)		—			—			—		—		—			—
Net periodic benefit (credit) cost	$	(1	)	$	(5	)	$	(1	)	$	1		$	—	$	—	$	(1	)	$	—

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Goodwill and Intangible Assets (Tables)

3 Months Ended

Dec. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Goodwill Balances

The carrying amount of goodwill attributable to each reportable segment with goodwill balances and the changes in those balances during the three month period ended December 31, 2018 are as follows:

	Reinforcement Materials			Performance Chemicals			Total
	(In millions)
Balance at September 30, 2018	$	52		$	41		$	93
Foreign currency impact		(2	)		(1	)		(3	)
Balance at December 31, 2018	$	50		$	40		$	90

Schedule of Intangible Assets

The following table provides information regarding the Company’s intangible assets:

	December 31, 2018							September 30, 2018
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(In millions)
Intangible assets with finite lives
Developed technologies	$	51	$	(2	)	$	49	$	52	$	(2	)	$	50
Trademarks		8		—			8		8		—			8
Customer relationships		49		(12	)		37		51		(11	)		40
Total intangible assets	$	108	$	(14	)	$	94	$	111	$	(13	)	$	98

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Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Dec. 31, 2018

Equity [Abstract]

Changes in Each Component of AOCI, Net of Tax

Changes in each component of AOCI, net of tax, were as follows:

	Currency Translation Adjustment			Unrealized Gains on Investments		Pension and Other Postretirement Benefit Liability Adjustments			Total
	(In millions)
Balance at September 30, 2018, attributable to Cabot Corporation	$	(266	)	$	1	$	(52	)	$	(317	)
Other comprehensive income (loss) before reclassifications		(24	)		—		30			6
Amounts reclassified from AOCI		(1	)		—		(8	)		(9	)
Less: Other comprehensive income (loss) attributable to    noncontrolling interests		—			—		—			—
Balance at December 31, 2018, attributable to Cabot Corporation	$	(291	)	$	1	$	(30	)	$	(320	)

Amounts Reclassified Out of AOCI

The amounts reclassified out of AOCI and into the Consolidated Statements of Operations in the three months ended December 31, 2018 and 2017 were as follows:

	Affected Line Item in the Consolidated	Three Months Ended December 31
	Statements of Operations	2018			2017
		(In millions)
Derivatives: net investment hedges
(Gains) losses reclassified to interest    expense	Interest expense	$	(1	)	$	(1	)
Pension and other postretirement    benefit liability adjustment
Amortization of actuarial losses	Net Periodic Benefit Cost - see    Note D for details		1			1
Amortization of prior service credit	Net Periodic Benefit Cost - see    Note D for details		—			(1	)
Settlement and curtailment gain	Net Periodic Benefit Cost - see    Note D for details		(6	)		—
Total before tax			(6	)		(1	)
Tax impact	Provision (benefit) for income    taxes		(3	)		—
Total after tax		$	(9	)	$	(1	)

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Commitments and Contingencies (Tables)

3 Months Ended

Dec. 31, 2018

Commitments And Contingencies Disclosure [Abstract]

Schedule of Components of Purchase Commitments

Cabot has entered into long-term purchase agreements primarily for the purchase of raw materials. Under certain of these agreements, the quantity of material being purchased is fixed, but the price paid changes as market prices change. For these purchase commitments, the amounts included in the table below are based on market prices at December 31, 2018, which may differ from actual market prices at the time of purchase.

	Payments Due by Fiscal Year
	Remainder of Fiscal 2019		2020		2021		2022		2023		Thereafter		Total
	(In millions)
Reinforcement Materials	$	263	$	248	$	141	$	137	$	130	$	1,703	$	2,622
Performance Chemicals		73		59		55		55		32		454		728
Purification Solutions		6		6		1		—		—		—		13
Specialty Fluids		15		—		—		—		—		—		15
Total	$	357	$	313	$	197	$	192	$	162	$	2,157	$	3,378

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Income Tax (Tables)

3 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Effective Tax Rate

Effective Tax Rate

	Three Months Ended December 31
	2018			2017
	(Dollars in millions)
(Provision) benefit for income taxes	$	7		$	(205	)
Effective tax rate		(10	)%		224	%

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Earnings Per Share (Tables)

3 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Components of Basic and Diluted Earnings (Loss) Per Common Share (EPS)

The following tables summarize the components of the basic and diluted earnings (loss) per common share (“EPS”) computations:

	Three Months Ended December 31
	2018		2017
	(In millions, except per share amounts)
Basic EPS:
Net income (loss) attributable to Cabot    Corporation	$	69	$	(122	)
Less: Undistributed earnings allocated to    participating securities(1)		—		—
Earnings (loss) allocated to common    shareholders (numerator)	$	69	$	(122	)
Weighted average common shares and    participating securities outstanding		60.8		62.6
Less: Participating securities(1)		0.9		0.7
Adjusted weighted average common    shares (denominator)		59.9		61.9
Earnings (loss) per common share - basic:	$	1.14	$	(1.98	)
Diluted EPS:
Earnings (loss) allocated to common    shareholders	$	69	$	(122	)
Plus: Earnings (loss) allocated to    participating securities		1		—
Less: Adjusted earnings allocated to    participating securities(2)		1		—
Earnings (loss) allocated to common    shareholders (numerator)	$	69	$	(122	)
Adjusted weighted average common    shares outstanding		59.9		61.9
Effect of dilutive securities:
Common shares issuable(3)		0.2		—
Adjusted weighted average common    shares (denominator)		60.1		61.9
Earnings (loss) per common share - diluted:	$	1.14	$	(1.98	)

⁽¹⁾ Participating securities consist of shares underlying outstanding and achieved performance-based restricted stock units issued during and after fiscal 2017 and all unvested time-based restricted stock units.

Calculation of Undistributed Earnings

Undistributed earnings are the earnings which remain after dividends declared during the period are assumed to be distributed to the common and participating shareholders. Undistributed earnings are allocated to common and participating shareholders on the same basis as dividend distributions. The calculation of undistributed earnings is as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Calculation of undistributed earnings (loss):
Net income (loss) attributable to Cabot Corporation	$	69	$	(122	)
Less: Dividends declared on common stock		20		20
Undistributed earnings (loss)	$	49	$	(142	)
Allocation of undistributed earnings (loss):
Undistributed earnings (loss) allocated to    common shareholders	$	49	$	(142	)
Undistributed earnings (loss)	$	49	$	(142	)

⁽²⁾ Undistributed earnings are adjusted for the assumed distribution of dividends to the dilutive securities, which are described in (3) below, and then reallocated to participating securities.

⁽³⁾ Represents incremental shares of common stock from the (i) assumed exercise of stock options issued under Cabot’s equity incentive plans; (ii) assumed issuance of shares to employees pursuant to the Company’s Deferred Compensation and Supplemental Retirement Plan; and (iii) assumed issuance of shares for outstanding and achieved performance-based restricted stock unit awards issued before fiscal 2017 under Cabot’s equity incentive plans using the treasury stock method. For the three months ended December 31, 2018, 687,995 incremental shares of common stock were excluded from the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive. For the three months ended December 31, 2017, 764,077incremental shares of common stock were excluded from the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive.

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Restructuring (Tables)

3 Months Ended

Dec. 31, 2018

Restructuring And Related Activities [Abstract]

Recorded Restructuring Activities

Cabot’s restructuring activities were recorded in the Consolidated Statements of Operations in the three months ended December 31, 2018 and 2017 as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Cost of sales	$	3	$	1
Selling and administrative expenses		6		—
Total	$	9	$	1

Restructuring Activities and Related Reserves

Details of all restructuring activities and the related reserves during the three months ended December 31, 2018 were as follows:

	Severance and Employee Benefits			Environmental Remediation		Asset Impairment and Accelerated Depreciation			Other			Total
	(In millions)
Reserve at September 30, 2018	$	1		$	4	$	—		$	—		$	5
Charges		7			—		1			1			9
Costs charged against assets / (liabilities)		—			1		(1	)		—			—
Cash received (paid)		(1	)		—		—			(1	)		(2	)
Reserve at December 31, 2018	$	7		$	5	$	—		$	—		$	12

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Derivatives (Tables)

3 Months Ended

Dec. 31, 2018

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Details of Derivatives Held to Manage Foreign Currency Risk

The following table provides details of the derivatives held as of December 31, 2018 and September 30, 2018 to manage foreign currency risk.

		Notional Amount
Description	Borrowing	December 31, 2018	September 30, 2018	Hedge Designation
Cross-Currency Swaps	3.4% Notes	USD 250 million swapped to EUR 223 million	USD 250 million swapped to EUR 223 million	Net investment
Forward Foreign Currency Contracts (1)	N/A	USD 14 million	USD 18 million	No designation

⁽¹⁾ Cabot’s forward foreign exchange contracts are denominated in the Canadian dollar, Indonesian rupiah and Czech koruna.

Summary Impact of Cross-currency Swaps to AOCI and Consolidated Statements of Operations

The following tables summarize the impact of the cross-currency swaps to AOCI and the Consolidated Statements of Operations:

	Three Months Ended December 31
	2018		2017			2018			2017			2018		2017
Description	Gain/(Loss) Recognized in AOCI					(Gain)/Loss Reclassified from AOCI into Interest Expense in the Consolidated Statements of Operations						(Gain)/Loss Recognized in Interest Expense in the Consolidated Statements of Operations (Amount Excluded from Effectiveness Testing)
	(In millions)
Cross-currency swaps	$	8	$	(5	)	$	(1	)	$	(1	)	$	—	$	—

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Financial Information by Segment (Tables)

3 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Performance Segment

The net sales from each of these businesses for the three months ended December 31, 2018 and 2017 were as follows:

	Three Months Ended December 31
	2018		2017
	(In millions)
Performance Additives	$	167	$	159
Formulated Solutions		64		70
Performance Chemicals	$	231	$	229

Financial Information by Reportable Segment

Financial information by reportable segment is as follows:

	Reinforcement Materials		Performance Chemicals		Purification Solutions			Specialty Fluids			Segment Total		Unallocated and Other(1)			Consolidated Total
	(In millions)
Three Months Ended December 31, 2018
Revenues from external customers(2)	$	457	$	231	$	65		$	19		$	772	$	49		$	821
Income (loss) from continuing operations    before income taxes(3)	$	62	$	36	$	(3	)	$	10		$	105	$	(35	)	$	70
Three Months Ended December 31, 2017
Revenues from external customers(2)	$	387	$	229	$	70		$	6		$	692	$	28		$	720
Income (loss) from continuing operations    before income taxes(3)	$	62	$	47	$	6		$	(2	)	$	113	$	(21	)	$	92

⁽¹⁾ Unallocated and Other includes certain items and eliminations necessary to reflect management’s reporting of operating segment results. These items are reflective of the segment reporting presented to the CODM.

⁽²⁾ Consolidated Total Revenues from external customers reconciles to Net sales and other operating revenues on the Consolidated Statements of Operations.Revenues from external customers that are categorized as Unallocated and Other reflects royalties, external shipping and handling fees, the impact of unearned revenue, the removal of 100% of the sales of an equity method affiliate, discounting charges for certain Notes receivable, and by-product revenue.Details are provided in the table below:

	Three Months Ended December 31
	2018			2017
	(In millions)
Royalties, the impact of unearned revenue, the removal of 100% of    the sales of an equity method affiliate and discounting charges for    certain notes receivable	$	(3	)	$	1
Shipping and handling fees		32			27
By-product sales(a)		20			—
Total	$	49		$	28

^(a) Beginning in fiscal 2019 as part of the adoption of the new accounting standard, Revenue from Contracts with Customers, the Company includes revenue from by-products produced in manufacturing operations in Net sales and other operating revenues, which in prior years was included as a reduction in Cost of sales.

⁽³⁾ Consolidated Total Income (loss) from continuing operations before income taxes reconciles to Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies on the Consolidated Statements of Operations.Income (loss) from continuing operations before income taxes that are categorized as Unallocated and Other includes:

	Three Months Ended December 31
	2018			2017
	(In millions)
Interest expense	$	(15	)	$	(13	)
Certain items(a)
Global restructuring activities		(9	)		(1	)
Legal and environmental matters and reserves		—			(1	)
Gains (losses) on sale of investments		—			10
Acquisition and integration-related charges		(3	)		—
Other		2			(1	)
Total certain items, pre-tax		(10	)		7
Unallocated corporate costs(b)		(12	)		(14	)
General unallocated income (expense)(c)		2			—
Less: Equity in earnings of affiliated companies, net of tax(d)		—			1
Total	$	(35	)	$	(21	)

^(a) Certain items areitems of expense and income that management does not consider representative of the Company’s fundamental on-going segment results and they are, therefore, excluded from Segment EBIT.

^(b) Unallocated corporate costs are costs that are not controlled by the segments and primarily benefit corporate interests.

^(c) General unallocated income (expense) consists of gains (losses) arising from foreign currency transactions, net of other foreign currency risk management activities, the profit or loss related to the corporate adjustment for unearned revenue, and the impact of including the full operating results of a contractual joint venture in Purification Solutions Segment EBIT.

^(d) Equity in earnings of affiliated companies, net of tax, is included in Segment EBIT and is removed in Unallocated and other to reconcile to Income (loss) from operations before income taxes and equity in earnings from affiliated companies.

Revenues from External Customers by Geographic Region

The Company’s segments operate globally. In addition to presenting Revenue from external customers by reportable segment, the following table further disaggregates Revenue from external customers by geographic region.

	Three Months Ended December 31, 2018
	Reinforcement Materials		Performance Chemicals		Purification Solutions		Specialty Fluids		Consolidated Total
	(In millions)
Americas	$	167	$	72	$	29	$	2	$	270
Asia Pacific		202		85		9		1		297
Europe, Middle East and Africa		88		74		27		16		205
Segment revenues from external customers		457		231		65		19		772
Unallocated and other										49
Net sales and other operating revenues									$	821

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Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Nov. 30, 2018	Nov. 30, 2013	Dec. 31, 2018	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Net sales and other operating revenues			$ 821.0	$ 720.0
Cost of sales			655.0	$ 544.0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Significant Accounting Policies [Line Items]
Net sales and other operating revenues			(20.0)
Cost of sales			(20.0)
NHUMO [Member]
Significant Accounting Policies [Line Items]
Preferred stock repurchase amount	$ 25.0	$ 25.0
Dividend percentage of preferred stock		6.00%
Preferred stock dividend	$ 1.4
Specialty Fluids [Member]
Significant Accounting Policies [Line Items]
Revenue recognized			$ 8.0
Minimum [Member]
Significant Accounting Policies [Line Items]
Payment terms			0 days
Minimum [Member] | Buildings [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			20 years
Minimum [Member] | Machinery and Equipment [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			10 years
Minimum [Member] | Other Fixed Assets [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			3 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Payment terms			90 days
Maximum [Member] | Buildings [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			25 years
Maximum [Member] | Machinery and Equipment [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			25 years
Maximum [Member] | Other Fixed Assets [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			25 years

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Significant Accounting Policies - Schedule of Change Retrospectively to Prior Periods Consolidated Statements of Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Cost of sales	$ 655	$ 544
Gross profit	166	176
Selling and administrative expenses	73	70
Research and technical expenses	16	15
Income (loss) from operations	77	91
Other income (expense)	$ 6	11
Change in Method of Accounting for Inventories from Last-in, First-out Method to First-in, First-out Method [Member]
Significant Accounting Policies [Line Items]
Cost of sales		544
Gross profit		176
Selling and administrative expenses		70
Research and technical expenses		15
Income (loss) from operations		91
Other income (expense)		11
Change in Method of Accounting for Inventories from Last-in, First-out Method to First-in, First-out Method [Member] | As Originally Reported [Member]
Significant Accounting Policies [Line Items]
Cost of sales		542
Gross profit		178
Selling and administrative expenses		69
Research and technical expenses		15
Income (loss) from operations		94
Other income (expense)		8
Change in Method of Accounting for Inventories from Last-in, First-out Method to First-in, First-out Method [Member] | Effect of Change [Member]
Significant Accounting Policies [Line Items]
Cost of sales		2
Gross profit		(2)
Selling and administrative expenses		1
Income (loss) from operations		(3)
Other income (expense)		$ 3

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Acquisitions - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Sep. 30, 2018	Nov. 30, 2017	Mar. 31, 2019
Tech Blend [Member]
Business Acquisition [Line Items]
Acquisition date		Nov. 30, 2017
Business acquisition, purchase price		$ 65
Intangible assets		29
Tech Blend [Member] | Developed Technologies [Member]
Business Acquisition [Line Items]
Intangible assets		$ 21
Intangible assets, amortization period		25 years
Tech Blend [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets		$ 8
Intangible assets, amortization period		12 years
NSCC Carbon (Jiangsu) Co. Ltd [Member]
Business Acquisition [Line Items]
Acquisition date	Sep. 30, 2018
Expected Production commencement year			2021
Transition related costs			$ 2

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Acquisitions - Preliminary Purchase Price Estimates Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018	Nov. 30, 2017
Assets
Goodwill	$ 90	$ 93
Tech Blend [Member]
Assets
Cash			$ 1
Accounts receivable			5
Inventories			3
Property, plant and equipment			7
Intangible assets			29
Goodwill			33
Total assets acquired			78
Liabilities
Current liabilities			(3)
Deferred tax liabilities			(10)
Total liabilities assumed			(13)
Cash consideration paid			$ 65

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Employee Benefit Plans - Net Periodic Defined Benefit Pension and Other Postretirement Benefit Costs (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1	$ 1
Expected return on plan assets	(2)	(2)
Net periodic benefit (credit) cost	(1)	(1)
Pension Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2
Interest cost	2	2
Expected return on plan assets	(4)	(4)
Amortization of actuarial loss	1	1
Settlement and curtailment gain	(6)
Net periodic benefit (credit) cost	$ (5)	1
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service credit		(1)
Net periodic benefit (credit) cost		$ (1)

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Employee Benefit Plans - Additional Information (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2018 USD ($) Plan
Defined Benefit Plan Disclosure [Line Items]
Number of foreign defined benefit plans | Plan	1
Reduction in net pension obligations	$ (30)
Pre-tax gain from net pension obligations	6
Settlement credit	5
Plan assets remain to be transferred.	8
Additional charge on defined benefit plan actuarial gain (loss)	$ 3
Pay out period for additional charge payment	5 years
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Curtailment credit	$ 1

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Goodwill and Intangible Assets - Schedule of Goodwill Balances (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2018 USD ($)
Goodwill And Intangible Assets [Line Items]
Beginning balance	$ 93
Foreign currency impact	(3)
Ending balance	90
Reinforcement Materials [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	52
Foreign currency impact	(2)
Ending balance	50
Performance Chemicals [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	41
Foreign currency impact	(1)
Ending balance	$ 40

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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	$ 108	$ 111
Accumulated Amortization	(14)	(13)
Net Intangible Assets, finite lives	94	98
Developed Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	51	52
Accumulated Amortization	(2)	(2)
Net Intangible Assets, finite lives	49	50
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	8	8
Net Intangible Assets, finite lives	8	8
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	49	51
Accumulated Amortization	(12)	(11)
Net Intangible Assets, finite lives	$ 37	$ 40

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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Intangible Assets [Line Items]
Amortization expense estimated for year one	$ 6
Amortization expense estimated for year two	6
Amortization expense estimated for year three	6
Amortization expense estimated for year four	6
Amortization expense estimated for year five	6
Cost of Sales and Selling and Administrative Expenses [Member]
Goodwill And Intangible Assets [Line Items]
Amortization of intangible assets	$ 1	$ 2
Minimum [Member]
Goodwill And Intangible Assets [Line Items]
Useful life of intangible assets	12 years
Maximum [Member]
Goodwill And Intangible Assets [Line Items]
Useful life of intangible assets	25 years
Weighted Average [Member]
Goodwill And Intangible Assets [Line Items]
Useful life of intangible assets	19 years

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Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of AOCI, Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 1,279	$ 1,625
Ending Balance	1,276	1,472
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(266)
Other comprehensive income (loss) before reclassifications	(24)
Amounts reclassified from AOCI	(1)
Ending Balance	(291)
Unrealized Gains on Investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	1
Ending Balance	1
Pension and Other Postretirement Benefit Liability Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(52)
Other comprehensive income (loss) before reclassifications	30
Amounts reclassified from AOCI	(8)
Ending Balance	(30)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(317)	(259)
Other comprehensive income (loss) before reclassifications	6
Amounts reclassified from AOCI	(9)	(1)
Ending Balance	$ (320)	$ (263)

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Accumulated Other Comprehensive Income (Loss) - Amounts Reclassified Out of AOCI (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
(Gains) Losses Reclassified to Interest Expense [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ (1)	$ (1)
Amortization of Actuarial Losses [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	1	1
Amortization of Prior Service Credit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		(1)
Settlement and Curtailment Gain [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(6)
Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(6)	(1)
Tax impact	(3)
Total after tax	$ (9)	$ (1)

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Commitments and Contingencies - Schedule of Components of Purchase Commitments (Detail) $ in Millions	Dec. 31, 2018 USD ($)
Long-term Purchase Commitment [Line Items]
Payments Due by Remainder of Fiscal Year 2019	$ 357
Payments Due by Fiscal Year 2020	313
Payments Due by Fiscal Year 2021	197
Payments Due by Fiscal Year 2022	192
Payments Due by Fiscal Year 2023	162
Payments Due Thereafter	2,157
Payments Due, Total	3,378
Reinforcement Materials [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Remainder of Fiscal Year 2019	263
Payments Due by Fiscal Year 2020	248
Payments Due by Fiscal Year 2021	141
Payments Due by Fiscal Year 2022	137
Payments Due by Fiscal Year 2023	130
Payments Due Thereafter	1,703
Payments Due, Total	2,622
Performance Chemicals [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Remainder of Fiscal Year 2019	73
Payments Due by Fiscal Year 2020	59
Payments Due by Fiscal Year 2021	55
Payments Due by Fiscal Year 2022	55
Payments Due by Fiscal Year 2023	32
Payments Due Thereafter	454
Payments Due, Total	728
Purification Solutions [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Remainder of Fiscal Year 2019	6
Payments Due by Fiscal Year 2020	6
Payments Due by Fiscal Year 2021	1
Payments Due, Total	13
Specialty Fluids [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Remainder of Fiscal Year 2019	15
Payments Due, Total	$ 15

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Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2018 USD ($) claimants	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($) claimants
Respirator Liabilities [Member]
Loss Contingencies [Line Items]
Number of claimants | claimants	35,000		35,000
Cash payments for respirator reserves	$ 1	$ 1
Respirator reserve	24		$ 25
Maximum [Member] | Respirator Liabilities [Member]
Loss Contingencies [Line Items]
Cash payments for respirator reserves	1	1
Environmental Matters [Member]
Loss Contingencies [Line Items]
Reserved for environmental matters	14		$ 15
Cash payments for environmental reserves	1	1
Environmental Matters [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Cash payments for environmental reserves	$ 1	$ 1

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Income Tax - Effective Tax Rate (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
(Provision) benefit for income taxes	$ 7	$ (205)
Effective tax rate	(10.00%)	224.00%

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Income Tax - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended				12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 30, 2018	Dec. 31, 2017	Dec. 30, 2017	Sep. 30, 2018
Income Taxes [Line Items]
Net discrete tax (benefits) charges related to tax settlements		$ (24)		$ 188
Net tax expense from impact of the Act		$ (17)		$ 185
Income tax rate	21.00%			35.00%		24.53%
Percentage of dividend received deduction for foreign dividends		100.00%
Income tax rate for aggregate cash position				15.50%
Income tax rate for exceeds aggregate cash position				8.00%
(Provision) benefit for income taxes for deemed repatriation		$ 17				$ (138)
Provisional tax expense		$ 121
Percentage of deduction for dividends from specified foreign corporations		100.00%
Provisional amount to tax expense			$ 8
Percentage of tax on foreign income in excess of a deemed return on tangible assets of foreign corporations		10.50%
Uncertain tax positions from expirations of statute of limitations			$ 7		$ 1
Earliest Tax Year [Member] | United States Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2014
Latest Tax Year [Member] | United States Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2017
State Tax Authorities [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2005
State Tax Authorities [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2017
Non-U.S. Jurisdictions [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2002
Non-U.S. Jurisdictions [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2017

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Earnings Per Share - Components of Basic and Diluted Earnings (Loss) Per Common Share (EPS) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Basic EPS:
Net income (loss) attributable to Cabot Corporation	$ 69	$ (122)
Earnings (loss) allocated to common shareholders (numerator)	$ 69	$ (122)
Weighted average common shares and participating securities outstanding	60.8	62.6
Less: Participating securities	0.9	0.7
Adjusted weighted average common shares (denominator)	59.9	61.9
Earnings (loss) per common share - basic:	$ 1.14	$ (1.98)
Diluted EPS:
Earnings (loss) allocated to common shareholders	$ 69	$ (122)
Plus: Earnings (loss) allocated to participating securities	1
Less: Adjusted earnings allocated to participating securities	1
Earnings (loss) allocated to common shareholders (numerator)	$ 69	$ (122)
Adjusted weighted average common shares outstanding	59.9	61.9
Common shares issuable	0.2
Adjusted weighted average common shares (denominator)	60.1	61.9
Earnings (loss) per common share - diluted:	$ 1.14	$ (1.98)

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Earnings Per Share - Calculation of Undistributed Earnings (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income (loss) attributable to Cabot Corporation	$ 69	$ (122)
Less: Dividends declared on common stock	20	20
Undistributed earnings (loss)	49	(142)
Undistributed earnings (loss) allocated to common shareholders	$ 49	$ (142)

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Earnings Per Share - Components of Basic and Diluted Earnings (Loss) Per Common Share (EPS) (Parenthetical) (Detail) - shares	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share	687,995	764,077

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Restructuring - Additional Information (Detail) $ in Millions		3 Months Ended			9 Months Ended
	Oct. 01, 2017 USD ($) ProductionUnit	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring Charges			$ 9
Scenario, Forecast
Restructuring Cost And Reserve [Line Items]
Accelerated depreciation charges		$ 1			$ 1
Restructuring Activities Other
Restructuring Cost And Reserve [Line Items]
Accrued environmental costs			5
Previous Actions and Sites Pending Sale [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs			1
Previous Actions and Sites Pending Sale [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs			1
Accelerated depreciation charges			1
Previous Actions and Sites Pending Sale [Member] | Restructuring Activities Other | Scenario, Forecast
Restructuring Cost And Reserve [Line Items]
Restructuring cash payments through the reminder of fiscal 2019 and thereafter					5
Purification Solutions Transformation Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Charges			8
Severance costs			7
Professional fees			1
Restructuring cash payments of fiscal year			1
Accrued severance charges			7
Purification Solutions Transformation Plan [Member] | Scenario, Forecast
Restructuring Cost And Reserve [Line Items]
Restructuring cash payments through the reminder of fiscal 2019 and thereafter					$ 7
Marshall, Texas Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	$ 1
Number of idled production units | ProductionUnit	3
Number of production units | ProductionUnit	7
Accelerated depreciation charges	$ 1
Marshall, Texas Plan [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs	$ 1
Operational Restructuring [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Charges			$ 1	$ 1

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Restructuring - Recorded Restructuring Activities (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Restructuring reserve, period expense	$ 9	$ 1
Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve, period expense	3	$ 1
Selling and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve, period expense	$ 6

XML

Restructuring - Restructuring Activities and Related Reserves (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Reserve balance	$ 5
Charges	9
Cash received (paid)	(2)
Reserve balance	12
Severance and Employee Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Reserve balance	1
Charges	7
Cash received (paid)	(1)
Reserve balance	7
Environmental Remediation [Member]
Restructuring Cost And Reserve [Line Items]
Reserve balance	4
Costs charged against assets / (liabilities)	1
Reserve balance	5
Asset Impairment and Accelerated Depreciation [Member]
Restructuring Cost And Reserve [Line Items]
Charges	1
Costs charged against assets / (liabilities)	(1)
Other [Member]
Restructuring Cost And Reserve [Line Items]
Charges	1
Cash received (paid)	$ (1)

XML

Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, liabilities, Level 2 to Level 1 transfers, amount	$ 0	$ 0
Fair value, assets, Level 2 to Level 1 transfers, amount	0	0
Fair value, liabilities, Level 1 to Level 2 transfers, amount	0	0
Fair value, assets, Level 1 to Level 2 transfers, amount	0	0
Fair value, assets, transfers into Level 3, amount	0	0
Fair value, assets, transfers out of Level 3, amount	0	0
Fair value, liabilities, transfers into Level 3, amount	0	0
Fair value, liabilities, transfers out of Level 3, amount	0	$ 0
Fair value of long-term debt	681,000,000,000		$ 742,000,000,000
Fixed Rate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of long-term debt	669,000,000,000		747,000,000,000
Significant Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets in the Consolidated Balance Sheets	11,000,000		11,000,000
Significant Observable Inputs (Level 2) [Member] | Foreign Currency Risks [Member] | Prepaid Expenses and Other Current Assets and Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair Value, net	$ (10,000,000)		$ (18,000,000)

XML

Derivatives - Details of Derivatives Held to Manage Foreign Currency Risk (Detail)		Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 EUR (€)
Net Investment Hedge [Member] | Cross Currency Swaps [Member]
Derivative [Line Items]
Notional Amount		$ 250,000,000
Net Investment Hedge [Member] | 3.4% Notes [Member] | Cross Currency Swaps [Member]
Derivative [Line Items]
Notional Amount		$ 250,000,000	€ 223,000,000	$ 250,000,000	€ 223,000,000
Net Investment Hedge [Member] | 3.4% Notes [Member] | Fixed Rate Debt [Member] | Cross Currency Swaps [Member]
Derivative [Line Items]
Interest rate on borrowing		3.40%	3.40%	3.40%	3.40%
Not Designated as Hedging Instrument [Member] | Forward Foreign Currency Contracts [Member]
Derivative [Line Items]
Notional Amount	[1]	$ 14,000,000		$ 18,000,000

[1] Cabot’s forward foreign exchange contracts are denominated in the Canadian dollar, Indonesian rupiah and Czech koruna.

XML

Derivatives - Additional Information (Detail) - Cross Currency Swaps [Member] - USD ($)	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018
Prepaid Expenses And Other Asset Current And Other Liabilities [Member]
Derivative [Line Items]
Fair value of swaps, net liability	$ 10,000,000	$ 18,000,000
Net Investment Hedge [Member]
Derivative [Line Items]
Notional Amount	250,000,000
Cumulative gain (loss) related to swaps	$ (7,000,000)	$ (14,000,000)
Net Investment Hedge [Member] | Fixed Rate Debt [Member]
Derivative [Line Items]
Derivative Instruments Frequency of Cash Settlements	semi-annually

XML

Derivatives - Summary Impact of Cross-currency Swaps to AOCI and Consolidated Statements of Operations (Detail) - Cross Currency Swaps [Member] - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments Gain Loss [Line Items]
Gain/(Loss) Recognized in AOCI	$ 8	$ (5)
(Gain)/Loss Reclassified from AOCI into Interest Expense in the Consolidated Statements of Operations	$ (1)	$ (1)

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Hyperinflationary Economies - Additional Information (Detail) Bs. / $ in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($) $ / $ Bs. / $	Dec. 31, 2017 USD ($)	Sep. 30, 2018 Bs. / $
Schedule Of Equity Method Investments [Line Items]
Other income (expense)	$ 6	$ 11
Argentina [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage of net revenue	2.00%
Other income (expense)	$ 1
Foreign currency exchange rate, translation | $ / $	37.70
Argentina [Member] | Maximum [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage of assets and liabilities current	2.00%		2.00%
Venezuela [Member]
Schedule Of Equity Method Investments [Line Items]
Operating affiliate investment	$ 12
Venezuela [Member] | Devaluation Of Venezuelan Bolivar [Member]
Schedule Of Equity Method Investments [Line Items]
Foreign currency exchange rate, translation | Bs. / $	56.4		6.2
Venezuela [Member] | Subsidiaries [Member]
Schedule Of Equity Method Investments [Line Items]
Cash dividends received from subsidiary	$ 1	$ 2
Venezuela [Member] | Carbon Black Affiliate [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Carbon Black Operating Entity [Member] | Argentina [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership percentage	100.00%

XML

Financial Information by Segment - Additional Information (Detail)	3 Months Ended
	Dec. 31, 2018 Segment
Segment Reporting Information [Line Items]
Number of business reportable segments	4
Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Number of business reportable segments	1

XML

Financial Information by Segment - Schedule of Performance Segment (Detail) - Performance Chemicals [Member] - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 231	$ 229
Performance Additives [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	167	159
Formulated Solutions [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	$ 64	$ 70

XML

Financial Information by Segment - Financial Information by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues from external customers	$ 821	$ 720
Income (loss) from continuing operations before income taxes	70	92
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	772	692
Income (loss) from continuing operations before income taxes	105	113
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	49	28
Income (loss) from continuing operations before income taxes	(35)	(21)
Reinforcement Materials [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	457	387
Income (loss) from continuing operations before income taxes	62	62
Performance Chemicals [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	231	229
Income (loss) from continuing operations before income taxes	36	47
Purification Solutions [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	65	70
Income (loss) from continuing operations before income taxes	(3)	6
Specialty Fluids [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	19	6
Income (loss) from continuing operations before income taxes	$ 10	$ (2)

XML

Financial Information by Segment - Financial Information by Reportable Segment (Parenthetical) (Detail)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Percentage of sale of an equity method affiliate	100.00%	100.00%

XML

Financial Information by Segment - Sales of Equity Method Affiliate and Discounting Charges for Certain Notes Receivable and By-product Revenue (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues from external customers	$ 821	$ 720
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	49	28
Unallocated and Other [Member] | Royalties, the Impact of Unearned Revenue, the Removal of 100% of the Sales of an Equity Method Affiliate and Discounting Charges for Certain Notes Receivable [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	(3)	1
Unallocated and Other [Member] | Shipping and Handling Costs [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	32	$ 27
Unallocated and Other [Member] | By-product Sales [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	$ 20

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Financial Information by Segment - Sales of Equity Method Affiliate and Discounting Charges for Certain Notes Receivable and By-product Revenue (Parenthetical) (Detail)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Percentage of sale of an equity method affiliate	100.00%	100.00%

XML

Financial Information by Segment - Schedule of Income (Loss) from Continuing Operations before Income Taxes and Equity in Earnings of Affiliated Companies for Unallocated and Other (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Interest expense	$ (15)	$ (13)
Global restructuring activities	(9)	(1)
Gains (losses) on sale of investments		10
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Interest expense	(15)	(13)
Unallocated corporate costs	(12)	(14)
General unallocated income (expense)	2
Less: Equity in earnings of affiliated companies, net of tax		1
Income from continuing operations before income taxes and equity in earnings of affiliated companies	(35)	(21)
Certain Item [Member]
Segment Reporting Information [Line Items]
Global restructuring activities	(9)	(1)
Legal and environmental matters and reserves		(1)
Gains (losses) on sale of investments		10
Acquisition and integration-related charges	(3)
Other	2	(1)
Total certain items, pre-tax	$ (10)	$ 7

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Financial Information by Segment - Revenue from External Customers by Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales and other operating revenues	$ 821	$ 720
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	772	692
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	49	28
Americas [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	270
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	297
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	205
Reinforcement Materials [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	457	387
Reinforcement Materials [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	167
Reinforcement Materials [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	202
Reinforcement Materials [Member] | Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	88
Performance Chemicals [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	231	229
Performance Chemicals [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	72
Performance Chemicals [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	85
Performance Chemicals [Member] | Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	74
Purification Solutions [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	65	70
Purification Solutions [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	29
Purification Solutions [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	9
Purification Solutions [Member] | Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	27
Specialty Fluids [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	19	$ 6
Specialty Fluids [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	2
Specialty Fluids [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	1
Specialty Fluids [Member] | Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	$ 16

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Subsequent Event - Additional Information (Detail) - Sinomine (Hong Kong) Rare Metals Resources Co. Limited [Member] - Specialty Fluids [Member] - USD ($) $ in Millions		3 Months Ended
	Jan. 30, 2019	Mar. 31, 2019
Scenario, Forecast
Subsequent Event [Line Items]
Non cash impairment charge		$ 25
Subsequent Event
Subsequent Event [Line Items]
Stock transaction value	$ 135
Purchase price	130
Additional cash royalties for lithium products	$ 5
Royalty payable term	10 years