Avaya (AVYA) 10-Q 13 Aug 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	AVAYA HOLDINGS CORP.
Entity Central Index Key	0001418100
Current Fiscal Year End Date	--09-30
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		111,016,298
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false

Consolidated Statements of Oper

Consolidated Statements of Operations shares in Millions, $ in Millions	2 Months Ended
	Dec. 15, 2017USD ($)$ / sharesshares
Predecessor
REVENUE
Revenue	$ 604
COSTS
TOTAL COST OF REVENUE	242
GROSS PROFIT	362
OPERATING EXPENSES
Selling, general and administrative	264
Research and development	38
Amortization of intangible assets	10
Asset Impairment Charges	0
Restructuring charges, net	14
TOTAL OPERATING EXPENSES	326
OPERATING (LOSS) INCOME	36
Interest expense	(14)
Other income (expense), net	(2)
Reorganization items, net	3,416
(LOSS) INCOME BEFORE INCOME TAXES	3,436
Benefit from (provision for) income taxes	(459)
NET INCOME (LOSS)	$ 2,977
(LOSS) EARNINGS PER SHARE
Net income (loss) per common share - basic (in usd per share) | $ / shares	$ 5.19
Net income (loss) per common share - diluted (in usd per share) | $ / shares	$ 5.19
Weighted average shares outstanding
Weighted average number of shares - basic (in shares) | shares	497.3
Weighted average number of shares - diluted (in shares) | shares	497.3
Predecessor | Products
REVENUE
Revenue	$ 253
COSTS
Total Cost of Goods and Services	84
Amortization of technology intangible assets	3
Predecessor | Services
REVENUE
Revenue	351
COSTS
Total Cost of Goods and Services	$ 155

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) Statement - USD ($) $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Net income (loss)		$ (633)	$ (88)	$ 19	$ (637)
Pension, post-retirement and postemployment benefit-related items, net of income taxes of $2 for the three and nine months ended June 30, 2019; and $(58) for the period from October 1, 2017 through December 15, 2017		(6)	0	0	(6)
Cumulative translation adjustment		(10)	(4)	(29)	9
Change in interest rate swaps, net of income taxes of $7 and $18 for the three and nine months ended June 30, 2019; and $3 for the three months ended June 30, 2018 and the period from December 16, 2017 through June 30, 2018		(22)	(12)	(12)	(53)
Other comprehensive (loss) income		(38)	(16)	(41)	(50)
Elimination of Predecessor Company accumulated other comprehensive loss		0	0	0	0
Total comprehensive (loss) income		$ (671)	$ (104)	$ (22)	$ (687)
Predecessor
Net income (loss)	$ 2,977
Pension, post-retirement and postemployment benefit-related items, net of income taxes of $2 for the three and nine months ended June 30, 2019; and $(58) for the period from October 1, 2017 through December 15, 2017	655
Cumulative translation adjustment	3
Change in interest rate swaps, net of income taxes of $7 and $18 for the three and nine months ended June 30, 2019; and $3 for the three months ended June 30, 2018 and the period from December 16, 2017 through June 30, 2018	0
Other comprehensive (loss) income	658
Elimination of Predecessor Company accumulated other comprehensive loss	790
Total comprehensive (loss) income	$ 4,425

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	2 Months Ended	3 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2019
Change in interest rate swaps, tax		$ 7	$ 18
Predecessor
Pension, post-retirement and postemployment benefit-related items, tax	$ (58)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2018
Statement of Financial Position [Abstract]
Temporary Equity, Carrying Amount, Attributable to Parent	$ 0	$ 0
Current assets:
Cash and cash equivalents	729	700
Accounts receivable, net	276	377
Inventory	71	81
Contract assets	178	0
Contract costs	128	0
Other current assets	149	170
TOTAL CURRENT ASSETS	1,531	1,328
Property, plant and equipment, net	243	250
Deferred income taxes, net	25	29
Intangible assets, net	2,978	3,234
Goodwill	2,105	2,764
Other assets	109	74
TOTAL ASSETS	6,991	7,679
Current liabilities:
Debt maturing within one year	29	29
Accounts payable	292	266
Payroll and benefit obligations	126	145
Contract liabilities	470	484
Business restructuring reserve, current portion	36	51
Other current liabilities	130	148
TOTAL CURRENT LIABILITIES	1,083	1,123
Non-current liabilities:
Long-term debt	3,091	3,097
Pension obligations	619	671
Other post-retirement obligations	181	176
Deferred income taxes, net	120	140
Business restructuring reserve, non-current portion	37	47
Other liabilities	390	374
TOTAL NON-CURRENT LIABILITIES	4,438	4,505
TOTAL LIABILITIES	5,521	5,628
STOCKHOLDER'S DEFICIENCY
Common stock	1	1
Additional paid-in capital	1,756	1,745
Accumulated deficit	(255)	287
Accumulated other comprehensive loss	(32)	18
TOTAL STOCKHOLDER'S DEFICIENCY	1,470	2,051
TOTAL LIABILITIES AND STOCKHOLDER'S DEFICIENCY	$ 6,991	$ 7,679

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2019	Sep. 30, 2018
Preferred Stock, Shares Outstanding	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	550,000,000	550,000,000
Common stock, shares issued	110,887,967	110,218,653
Common stock, shares outstanding	110,875,287	110,012,790
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred Stock, Shares Authorized	55,000,000
Preferred Stock, Shares Issued	0	0
Temporary Equity, Par or Stated Value Per Share	$ 0.01	$ 0.01
Temporary Equity, Shares Authorized	55,000,000	55,000,000

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Series A Preferred Stock	Series A Preferred StockAdditional Paid-in Capital	Series B Preferred Stock	Series B Preferred StockAdditional Paid-in Capital
Beginning Balance (in shares) (Predecessor) at Sep. 30, 2017		494.8
Beginning Balance (Predecessor) at Sep. 30, 2017	$ (5,013)		$ 2,389	$ (5,954)	$ (1,448)
Beginning Balance at Sep. 30, 2017		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of share-based compensation | Predecessor	3		3
Accrued dividends on Series A preferred stock | Predecessor						$ (2)	$ (2)	$ (4)	$ (4)
Reclassifications to equity awards on redeemable shares | Predecessor	1		1
Net income (loss) | Predecessor	2,977			2,977
Other comprehensive income (loss) | Predecessor	658				658
Cancellation of Predecessor equity (in shares) | Predecessor		(494.8)
Cancellation of Predecessor equity | Predecessor	(1,380)		(2,387)	(2,977)	(790)
Ending Balance (Predecessor) at Dec. 15, 2017	1,668	$ 1	1,667	0	0
Ending Balance at Dec. 15, 2017	1,668	$ 1	1,667	0	0
Ending Balance (in shares) (Predecessor) at Dec. 15, 2017		110
Ending Balance (in shares) at Dec. 15, 2017		110
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of December 15, 2017 (Predecessor) (in shares) | Predecessor		494.8
Balance as of December 15, 2017 (Predecessor) | Predecessor	(1,380)		2,387	(2,977)	(790)
Common stock issued for Predecessor debt (in shares) | Predecessor		103.9
Common stock issued for Predecessor debt | Predecessor	1,576	$ 1	1,575
Common stock issued for Pension Benefit Guaranty Corporation (in shares) | Predecessor		6.1
Common stock issued for Pension Benefit Guaranty Corporation | Predecessor	92		92
Net income (loss)	19
Other comprehensive income (loss)	(41)				(41)
Ending Balance at Jun. 30, 2018	1,718	$ 1	1,739	19	(41)
Ending Balance (in shares) at Jun. 30, 2018		110.2
Beginning Balance at Mar. 31, 2018					(25)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of shares redeemed and canceled, under employee stock option plan (in shares)		0.2
Amortization of share-based compensation	7		7
Net income (loss)	(88)			(88)
Other comprehensive income (loss)	(16)				(16)
Shares repurchased and retired for tax withholding on vesting of restricted stock units	(2)		(2)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	67		67
Adjustments To Additional Paid In Capital, Derivative Transactions Connected With Contingently Convertible Securities, Purchase Of Convertible Note Bond Hedge, Net	(64)		(64)
Adjustments to Additional Paid in Capital, Warrant Issued	58		58
Ending Balance at Jun. 30, 2018	1,718	$ 1	1,739	19	(41)
Ending Balance (in shares) at Jun. 30, 2018		110.2
Beginning Balance (in shares) at Sep. 30, 2018		110.2
Beginning Balance at Sep. 30, 2018	2,051	$ 1	1,745	287	18
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of shares redeemed and canceled, under employee stock option plan (in shares)		0.8
Issuance of common stock, net of shares redeemed and canceled, under employee stock option plan	0
Stock Repurchased During Period, Shares		(0.3)
Amortization of share-based compensation	6		6
Net income (loss)	9
Other comprehensive income (loss)	(20)				(20)
Shares repurchased and retired for tax withholding on vesting of restricted stock units	(6)		(6)
Ending Balance at Dec. 31, 2018	2,132	$ 1	1,745	388	(2)
Ending Balance (in shares) at Dec. 31, 2018		110.7
Beginning Balance (in shares) at Sep. 30, 2018		110.2
Beginning Balance at Sep. 30, 2018	2,051	$ 1	1,745	287	18
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(637)
Net income (loss) | Accounting Standards Update 2014-09 [Member]	(746)
Other comprehensive income (loss)	(50)				(50)
Ending Balance at Jun. 30, 2019	1,470	$ 1	1,756	(255)	(32)
Ending Balance (in shares) at Jun. 30, 2019		110.9
Beginning Balance (in shares) at Dec. 31, 2018		110.7
Beginning Balance at Dec. 31, 2018	2,132	$ 1	1,745	388	(2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of share-based compensation	5		5
Net income (loss)	(13)
Other comprehensive income (loss)	8				8
Ending Balance at Mar. 31, 2019	2,135	$ 1	1,750	378	6
Ending Balance (in shares) at Mar. 31, 2019		110.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | Accounting Standards Update 2014-09 [Member]	3			3
Issuance of common stock, net of shares redeemed and canceled, under employee stock option plan (in shares)		0.3
Issuance of common stock, net of shares redeemed and canceled, under employee stock option plan	0
Stock Repurchased During Period, Shares		(0.1)
Amortization of share-based compensation	8		8
Net income (loss)	(633)
Net income (loss) | Accounting Standards Update 2014-09 [Member]	(703)
Other comprehensive income (loss)	(38)				(38)
Shares repurchased and retired for tax withholding on vesting of restricted stock units	(2)		(2)
Ending Balance at Jun. 30, 2019	$ 1,470	$ 1	$ 1,756	(255)	$ (32)
Ending Balance (in shares) at Jun. 30, 2019		110.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | Accounting Standards Update 2014-09 [Member]				$ 3

Consolidated Statements of Cash

Consolidated Statements of Cash Flows $ in Millions	2 Months Ended	7 Months Ended	9 Months Ended
	Dec. 15, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)
OPERATING ACTIVITIES:
Net income (loss)		$ 19	$ (637)
Adjustments to reconcile loss from continuing operations to net cash provided by operating activities:
Depreciation and amortization		264	335
Share-based compensation		13	19
Amortization of debt issuance costs		1	12
Accretion of debt discount		2	4
Deferred income taxes, net		(207)	(27)
Asset Impairment Charges		0	659
Change in fair value of emergence date warrants		9	(28)
Unrealized loss (gain) on foreign currency transactions		(33)	9
Other non-cash charges, net		3	7
Reorganization items:
Net gain on settlement of Liabilities subject to compromise		0	0
Payment to Pension Benefit Guaranty Corporation		0	0
Payment to pension trust		0	0
Payment of unsecured claims		0	0
Fresh start adjustments, net		0	0
Non-cash and financing related reorganization items, net		0	0
Increase (Decrease) in Receivables		(23)	(100)
Changes in operating assets and liabilities:
Inventory		24	(14)
Contract assets		0	(99)
Increase (Decrease) In Capitalized Contract Costs, Net		0	(26)
Accounts payable		42	27
Payroll and benefit obligations		(73)	(66)
Business restructuring reserve		39	(23)
Contract liabilities		149	26
Other assets and liabilities		(98)	(103)
NET CASH PROVIDED BY OPERATING ACTIVITIES		177	175
INVESTING ACTIVITIES:
Capital expenditures		(36)	(84)
Payments to Acquire Businesses, Net of Cash Acquired		(157)	0
Payments to Acquire Investments		0	(10)
Other investing activities, net		1	(1)
NET CASH (USED FOR) PROVIDED BY INVESTING ACTIVITIES		(192)	(95)
FINANCING ACTIVITIES:
Proceeds from Issuance of Warrants		58	0
Payments for Hedge, Financing Activities		(84)	0
Repayment of debtor-in-possession financing		0	0
Repayment of first lien debt		0	0
Repayment of long-term debt		(15)	(22)
Debt issuance costs		(10)	0
Payment for Contingent Consideration Liability, Financing Activities		0	(9)
Payments related to sale-leaseback transactions		(7)	(10)
Other financing activities, net		(1)	(10)
NET CASH USED FOR FINANCING ACTIVITIES		284	(51)
Effect of exchange rate changes on cash and cash equivalents		(5)	1
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		264	30
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 435	699	734
Term Loan Credit Agreement due December 15, 2024
FINANCING ACTIVITIES:
Proceeds from Term Loan Credit Agreement		0	0
Term Loan Credit Agreement Due To Refinancing [Member]
FINANCING ACTIVITIES:
Proceeds from Term Loan Credit Agreement		2,911	0
Repayment of long-term debt		(2,918)	0
Convertible Notes [Member]
FINANCING ACTIVITIES:
Proceeds from Term Loan Credit Agreement		350	$ 0
Predecessor
OPERATING ACTIVITIES:
Net income (loss)	2,977
Adjustments to reconcile loss from continuing operations to net cash provided by operating activities:
Depreciation and amortization	31
Share-based compensation	0
Amortization of debt issuance costs	0
Accretion of debt discount	0
Deferred income taxes, net	455
Asset Impairment Charges	0
Change in fair value of emergence date warrants	0
Unrealized loss (gain) on foreign currency transactions	0
Other non-cash charges, net	0
Reorganization items:
Net gain on settlement of Liabilities subject to compromise	(1,778)
Payment to Pension Benefit Guaranty Corporation	(340)
Payment to pension trust	(49)
Payment of unsecured claims	(58)
Fresh start adjustments, net	(1,697)
Non-cash and financing related reorganization items, net	26
Increase (Decrease) in Receivables	(40)
Changes in operating assets and liabilities:
Inventory	(2)
Contract assets	0
Increase (Decrease) In Capitalized Contract Costs, Net	0
Accounts payable	(40)
Payroll and benefit obligations	16
Business restructuring reserve	(7)
Contract liabilities	28
Other assets and liabilities	(16)
NET CASH PROVIDED BY OPERATING ACTIVITIES	(414)
INVESTING ACTIVITIES:
Capital expenditures	(13)
Payments to Acquire Businesses, Net of Cash Acquired	0
Payments to Acquire Investments		$ 0
Other investing activities, net	0
NET CASH (USED FOR) PROVIDED BY INVESTING ACTIVITIES	(13)
FINANCING ACTIVITIES:
Proceeds from Issuance of Warrants	0
Payments for Hedge, Financing Activities	0
Repayment of debtor-in-possession financing	(725)
Repayment of first lien debt	(2,061)
Repayment of long-term debt	(111)
Debt issuance costs	(97)
Payment for Contingent Consideration Liability, Financing Activities	0
Payments related to sale-leaseback transactions	(4)
Other financing activities, net	0
NET CASH USED FOR FINANCING ACTIVITIES	(102)
Effect of exchange rate changes on cash and cash equivalents	(2)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(531)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	435
Predecessor | Term Loan Credit Agreement due December 15, 2024
FINANCING ACTIVITIES:
Proceeds from Term Loan Credit Agreement	2,896
Predecessor | Term Loan Credit Agreement Due To Refinancing [Member]
FINANCING ACTIVITIES:
Proceeds from Term Loan Credit Agreement	0
Repayment of long-term debt	0
Predecessor | Convertible Notes [Member]
FINANCING ACTIVITIES:
Proceeds from Term Loan Credit Agreement	$ 0

Background and Basis of Present

Background and Basis of Presentation	9 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background and Basis of Presentation	Background and Basis of Presentation Background Avaya Holdings Corp. (the "Parent" or "Avaya Holdings"), together with its consolidated subsidiaries (collectively, the "Company" or "Avaya"), is a global leader in digital communications products, solutions and services for businesses of all sizes. Avaya builds open, converged and innovative solutions to enhance and simplify communications and collaboration in the cloud, on-premises or a hybrid of both. The Company's global team of professionals delivers services from initial planning and design, to implementation and integration, to ongoing managed operations, optimization, training and support. Currently, the Company manages its business operations in two segments, Products & Solutions and Services. The Company sells directly through its worldwide sales force and indirectly through its global network of channel partners, including distributors, service providers, dealers, value-added resellers, system integrators and business partners that provide sales and services support. Basis of Presentation Avaya Holdings has no material assets or standalone operations other than its ownership of Avaya Inc. and its subsidiaries. The accompanying unaudited interim Condensed Consolidated Financial Statements as of June 30, 2019 and for the nine months ended June 30, 2019 , the period from December 16, 2017 through June 30, 2018 , and the period from October 1, 2017 through December 15, 2017 , reflect the operating results of Avaya Holdings and its consolidated subsidiaries, have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") and the rules and regulations of the U.S. Securities and Exchange Commission ("SEC") for interim financial statements, and should be read in conjunction with the audited Consolidated Financial Statements and other financial information for the fiscal year ended September 30, 2018 , included in the Company's Annual Report on Form 10-K filed with the SEC on December 21, 2018. In management's opinion, these unaudited interim Condensed Consolidated Financial Statements reflect all adjustments, consisting of normal and recurring adjustments, necessary to state fairly the results of operations, financial position and cash flows for the periods indicated. The condensed consolidated results of operations for the interim periods reported are not necessarily indicative of the results for the entire fiscal year. Management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and revenue and expenses during the periods reported. These estimates include assessing the collectability of accounts receivable, sales returns and allowances, the use and recoverability of inventory, the realization of deferred tax assets, business restructuring reserves, pension and post-retirement benefit costs, the fair value of equity compensation, the fair value of assets and liabilities in connection with fresh start accounting as well as those acquired in business combinations, the recoverability of long-lived assets, useful lives and impairment of tangible and intangible assets including goodwill, the amount of exposure from potential loss contingencies, and fair value measurements, among others. The markets for the Company's products are characterized by intense competition, rapid technological development and frequent new product introductions, all of which could affect the future recoverability of the Company's assets. Estimates and assumptions are reviewed periodically, and the effects of revisions are reflected in the consolidated financial statements in the period they are determined to be necessary. Actual results may differ from these estimates. During the nine months ended June 30, 2019 , the Company recorded out-of-period adjustments to correct Selling, general and administrative expense. The impact resulted in a $6 million increase to Selling, general and administrative expense and a decrease to net income of $4 million for the nine months ended June 30, 2019 . Management concluded that the correction was not material to any previously issued consolidated financial statements or to the nine months ended June 30, 2019 . The accompanying Condensed Consolidated Financial Statements of the Company have been prepared on a basis that assumes that the Company will continue as a going concern and contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. On January 19, 2017 (the "Petition Date"), Avaya Holdings, together with certain of its affiliates, namely Avaya CALA Inc., Avaya EMEA Ltd., Avaya Federal Solutions, Inc., Avaya Holdings LLC, Avaya Holdings Two, LLC, Avaya Inc., Avaya Integrated Cabinet Solutions Inc. (n/k/a Avaya Integrated Cabinet Solutions LLC), Avaya Management Services Inc., Avaya Services Inc., Avaya World Services Inc., Octel Communications LLC, Sierra Asia Pacific Inc., Sierra Communication International LLC, Technology Corporation of America, Inc., Ubiquity Software Corporation, VPNet Technologies, Inc. and Zang, Inc. (n/k/a Avaya Cloud Inc.) (the "Debtors"), filed voluntary petitions for relief (the "Bankruptcy Filing") under Chapter 11 of the United States Bankruptcy Code (the "Bankruptcy Code") in the United States Bankruptcy Court for the Southern District of New York (the "Bankruptcy Court"). The cases were jointly administered as Case No. 17-10089 (SMB). The Bankruptcy Court confirmed the Company's Second Amended Joint Chapter 11 Plan of Reorganization of Avaya Inc. and its Debtor Affiliates filed on October 24, 2017 (the "Plan of Reorganization") on November 28, 2017. Confirmation of the Plan of Reorganization resulted in the discharge of certain claims against the Company that arose before the Petition Date and terminated all rights and interests of equity security holders as provided for in the Plan of Reorganization. The Debtors operated their businesses as "debtors-in-possession" under the jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of Chapter 11 of the Bankruptcy Code and the orders of the Bankruptcy Court until the Plan of Reorganization was substantially consummated and they emerged from bankruptcy on December 15, 2017 (the "Emergence Date"). On the Emergence Date, the Company applied fresh start accounting, which resulted in a new basis of accounting and the Company becoming a new entity for financial reporting purposes. As a result of the application of fresh start accounting and the effects of the implementation of the Plan of Reorganization, the Condensed Consolidated Financial Statements after the Emergence Date are not comparable with the Condensed Consolidated Financial Statements on or before that date. References to "Successor" or "Successor Company" relate to the financial position and results of operations of the reorganized Avaya Holdings after the Emergence Date. References to "Predecessor" or "Predecessor Company" refer to the financial position and results of operations of Avaya Holdings on or before the Emergence Date.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Jun. 30, 2019
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business." This standard clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted this standard as of October 1, 2018 on a prospective basis. The adoption of this standard did not have an impact on the Company's Condensed Consolidated Financial Statements, however, the future impact of the standard will depend on the nature of any future acquisitions or dispositions made by the Company. In November 2016, the FASB issued ASU No. 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash." This standard requires the statement of cash flows to explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this standard as of October 1, 2018 applying the retrospective transition method to each period presented. The adoption resulted in an increase of Net cash used for investing activities of $55 million and $21 million for the period from December 16, 2017 through June 30, 2018 (Successor) and the period from October 1, 2017 through December 15, 2017 (Predecessor), respectively. In August 2016, the FASB issued ASU No. 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments." This standard addresses the appropriate classification of certain cash flows as operating, investing, or financing. The Company adopted this standard as of October 1, 2018 applying the retrospective transition method to each accounting period presented. The adoption of the standard did not have a material impact on the Company's Condensed Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers (Topic 606)" ("ASC 606"). This standard superseded most of the previous revenue recognition guidance under GAAP and is intended to improve and converge with international standards the financial reporting requirements for revenue recognition. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of control of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. New disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers are also required. The Company adopted ASC 606 as of October 1, 2018 using the modified retrospective transition method applied to all open contracts with customers that were not completed as of September 30, 2018 . Upon adoption of ASC 606, sales that include professional services, are generally recognized as the services are performed as opposed to upon completion and acceptance of the project. When such arrangements include products, products revenue is generally recognized when the products are delivered as opposed to upon completion and acceptance of the project. Additionally, for cloud and managed services arrangements pursuant to which the customer purchases and owns the solution and Avaya provides the software as a service ("SaaS"), control of the software generally transfers to the customer and the related revenue is recognized, at the point-in-time the SaaS commences. Revenue recognition related to stand-alone product shipments, maintenance services, and certain cloud offerings remains substantially unchanged. In addition to the impacts on revenue recognition, the standard requires incremental contract acquisition costs (primarily sales commissions) to be capitalized and amortized on a systematic basis that is consistent with the transfer of goods or services to which the asset relates. These costs were formerly expensed as incurred. The impact of adopting ASC 606 is dependent upon contract-specific terms and the Company has chosen to use the allowed practical expedient, whereby incremental contract acquisition costs with an amortization period of one year or less are expensed as incurred. On October 1, 2018 , the beginning of the Company's fiscal 2019 , the Company recorded a net increase to the opening Retained earnings balance of $92 million , net of tax, due to the cumulative impact of adopting ASC 606. During the nine months ended June 30, 2019 , the Company recorded a $3 million adjustment to correct the ASC 606 impact that was recorded to Retained earnings on October 1, 2018 . In connection with this adjustment, the Company also recorded an out-of-period adjustment during the nine months ended June 30, 2019 to correct goodwill recognized upon the application of fresh start accounting, which resulted in a $2 million decrease to Contract liabilities and a $2 million decrease to Goodwill. Management concluded that these corrections were not material to previously issued consolidated financial statements and to the three and nine months ended June 30, 2019 . The revised net increase to Retained earnings due to the cumulative impact of adopting ASC 606 was $95 million , net of tax. The increase to Retained earnings included $97 million for the portion of the transaction price that would have been recognized as revenue under prior guidance (ASC "605"). These amounts will not be recognized as revenue in future periods and are primarily attributable to open contracts that contained professional services, both on a stand-alone basis and when sold together with hardware and software, for which revenue recognition was deferred until project completion under ASC 605. The impact of the adoption of ASC 606 on the September 30, 2018 Condensed Consolidated Balance Sheet was as follows: (In millions) September 30, 2018 As Reported Adjustments Upon Adoption of ASC 606 ASSETS Accounts receivable, net $ 377 $ (1 ) $ 376 Inventory 81 (24 ) 57 Contract assets — 78 78 Contract costs — 109 109 Other current assets 170 (66 ) 104 Property, plant and equipment, net 250 (1 ) 249 Deferred income taxes, net 29 (2 ) 27 Other assets 74 16 90 LIABILITIES Contract liabilities 484 (17 ) 467 Other current liabilities 148 4 152 Deferred income taxes, net 140 29 169 Other liabilities 374 (2 ) 372 STOCKHOLDERS' EQUITY Retained earnings 287 95 382 For additional information refer to Note 3, "Revenue Recognition," for disclosures related to the adoption of ASC 606 and an updated accounting policy related to revenue recognition and contract costs. Recent Standards Not Yet Effective In August 2018, the FASB issued ASU 2018-15, "Intangibles - Goodwill and Other Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract." This standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The standard is effective for the Company in the first quarter of fiscal 2021, with early adoption permitted. The Company is currently assessing the impact the new guidance will have on its Condensed Consolidated Financial Statements. In August 2018, the FASB issued ASU No. 2018-14, "Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans." This standard modifies the disclosure requirements for employers that sponsor defined benefit pension or other post-retirement plans. This update removes disclosures that are not considered cost beneficial, clarifies certain required disclosures and adds additional disclosures. This standard is effective for the Company beginning in fiscal 2021, with early adoption permitted. The amendments in the standard need to be applied on a retrospective basis. The Company is currently assessing the impact of the standard on its disclosures. In August 2018, the FASB issued ASU No. 2018-13, "Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement." This standard modifies the disclosure requirements on fair value measurements by removing certain disclosures, modifying certain disclosures and adding additional disclosures. This standard is effective for the Company beginning in the first quarter of fiscal 2021. Certain disclosures in the standard need to be applied on a retrospective basis and others on a prospective basis. The Company is currently assessing the impact of the standard on its disclosures. In February 2018, the FASB issued ASU No. 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income." This standard allows companies to reclassify from accumulated other comprehensive income to retained earnings any stranded tax benefits resulting from the enactment of the Tax Cuts and Jobs Act. This standard is effective for the Company beginning in the first quarter of fiscal 2020. The Company is currently evaluating the impact that the adoption of this standard may have on its Condensed Consolidated Financial Statements. In June 2016, the FASB issued ASU No. 2016-13, "Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments." This standard, along with other guidance subsequently issued by the FASB, requires entities to estimate all expected credit losses for certain types of financial instruments, including trade receivables, held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The standard also expands the disclosure requirements to enable users of financial statements to understand the entity’s assumptions, models and methods for estimating expected credit losses. This standard is effective for the Company in the first quarter of fiscal 2021 on a prospective basis. The Company is currently evaluating the impact that the adoption of this standard may have on its Condensed Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)." This standard, along with other guidance subsequently issued by the FASB, requires lessees to recognize lease assets and liabilities for all leases with lease terms of more than 12 months. The standard makes similar changes to lessor accounting and aligns key aspects of the lessor accounting model with the revenue recognition standard. Presentation of leases within the statements of operations and statements of cash flows will primarily depend on its classification as a finance or operating lease. This standard is effective for the Company in the first quarter of fiscal 2020 with early adoption permitted. The Company expects to adopt this standard on October 1, 2019 using a modified retrospective transition method as of the beginning of the period of adoption and is continuing to evaluate the impact of this standard on its Condensed Consolidated Financial Statements.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition On October 1, 2018 , the Company adopted ASC 606 using the modified retrospective transition method. Accordingly, the impact of adoption was recorded as an adjustment to Retained earnings as of October 1, 2018 and represents the difference between ASC 606 and ASC 605 applied to all open contracts with customers that were not completed as of September 30, 2018 . Under the modified retrospective method, results for reporting periods beginning after September 30, 2018 are presented under ASC 606 while prior period financial information is not adjusted and continues to be reported in accordance with ASC 605. The Company elected to use the contract modification practical expedient, whereby all contract modifications for each contract before October 1, 2018 are aggregated and evaluated at the adoption date. Impact of ASC 606 on Financial Statement Line Items The impact of the adoption of ASC 606 by financial statement line item within the Condensed Consolidated Balance Sheet as of June 30, 2019 is as follows: June 30, 2019 (In millions) As Reported Adjustments Without Adoption of ASC 606 ASSETS Inventory $ 71 $ 33 $ 104 Contract assets 178 (178 ) — Contract costs 128 (128 ) — Other current assets 149 100 249 Property, plant and equipment, net 243 1 244 Deferred income taxes, net 25 2 27 Other assets 109 (10 ) 99 LIABILITIES Accounts payable 292 (1 ) 291 Contract liabilities 470 48 518 Other current liabilities 130 4 134 Deferred income taxes, net 120 (29 ) 91 Other liabilities 390 2 392 STOCKHOLDERS' EQUITY Retained earnings (255 ) (204 ) (459 ) The impact of the adoption of ASC 606 by financial statement line item within the Condensed Consolidated Statements of Operations for the three and nine months ended June 30, 2019 is as follows: Three months ended June 30, 2019 Nine months ended June 30, 2019 (In millions) As Reported Adjustments Without Adoption of ASC 606 As Reported Adjustments Without Adoption of ASC 606 REVENUE Products $ 297 $ (26 ) $ 271 $ 908 $ (71 ) $ 837 Services 420 (19 ) 401 1,256 (60 ) 1,196 717 (45 ) 672 2,164 (131 ) 2,033 COSTS Products: Costs 109 (4 ) 105 329 (13 ) 316 Amortization of technology intangible assets 43 — 43 130 — 130 Services 175 (7 ) 168 522 (20 ) 502 327 (11 ) 316 981 (33 ) 948 GROSS PROFIT 390 (34 ) 356 1,183 (98 ) 1,085 OPERATING EXPENSES Selling, general and administrative 253 (1 ) 252 761 3 764 Research and development 49 — 49 154 — 154 Amortization of intangible assets 41 — 41 122 — 122 Impairment charges 659 — 659 659 — 659 Restructuring charges, net 1 — 1 12 — 12 1,003 (1 ) 1,002 1,708 3 1,711 OPERATING LOSS (613 ) (33 ) (646 ) (525 ) (101 ) (626 ) Interest expense (59 ) — (59 ) (177 ) — (177 ) Other income, net 12 — 12 35 — 35 LOSS BEFORE INCOME TAXES (660 ) (33 ) (693 ) (667 ) (101 ) (768 ) Benefit from (provision for) income taxes 27 (37 ) (10 ) 30 (8 ) 22 NET LOSS $ (633 ) $ (70 ) $ (703 ) $ (637 ) $ (109 ) $ (746 ) The adoption of ASC 606 did not impact net cash provided by or used for operating, investing, or financing activities within the Condensed Consolidated Statement of Cash Flows for the nine months ended June 30, 2019 . Revenue Recognition Policy The Company derives revenue primarily from the sale of products and services for communications systems and applications. The Company sells directly through its worldwide sales force and indirectly through its global network of channel partners, including distributors, service providers, dealers, value-added resellers, systems integrators and business partners that provide sales and services support. In accordance with ASC 606, the Company accounts for a customer contract when both parties have approved the contract and are committed to perform their respective obligations, each party’s rights can be identified, payment terms can be identified, the contract has commercial substance and it is at least probable that the Company will collect the consideration to which it is entitled. Revenue is recognized upon the transfer of control of the promised products and services to customers. Judgment is required in instances where the Company’s contracts include multiple products and services to determine whether each should be accounted for as a separate performance obligation. The Company enters into contracts that include various combinations of products and services, each of which is generally capable of being distinct as well as distinct within the context of the contracts. Customer contracts are typically made pursuant to purchase orders and statements of work based on master purchase or partner agreements. Invoicing typically occurs upon customer acceptance or monthly for a series of services. Payment is due based on the Company’s standard payment terms which are typically within 30 to 60 days of invoice issuance. The Company does not typically provide financing arrangements to customers. For certain services and customer types, customers will remit payment before the services are provided. In instances where the timing of revenue recognition differs from the timing of invoicing, the Company determined that contracts do not include a significant financing component. The primary purpose of the invoicing terms is to provide customers with simplified and predictable ways of purchasing products and services, not to receive financing from or to provide financing to customers. Certain contracts include performance obligations accounted for as a series which also include variable consideration (primarily usage-based fees). For these arrangements, variable consideration is not estimated and allocated to the entire performance obligation, rather the variable fees are recognized in the period in which the usage occurs in accordance with the "right to invoice" practical expedient. The total transaction price for each contract is determined based on the total consideration specified in the contract, including variable consideration such as sales incentives and other discounts. The expected value method is generally used when estimating variable consideration, which typically reduces the total transaction price due to the nature of the elements to which the variable consideration relates. These estimates reflect the Company’s historical experience, current contractual and statutory requirements, specific known market events and trends, industry data and forecasted customer buying patterns. The Company excludes from the transaction price all taxes assessed by governmental authorities that are both (i) imposed on and concurrent with a specific revenue-producing transaction and (ii) collected from customers. Accordingly, such tax amounts are not included as a component of net sales or cost of sales. The expected value method requires judgment and considers multiple factors that may vary over time depending upon the unique facts and circumstances related to each performance obligation. Depending on the facts and circumstances, a change in variable consideration estimate will either be accounted for at the contract level or using the portfolio method, in accordance with the prescribed practical expedient. Reserves for contractual stock rotation rights to channel partners to support the management of inventory and certain other sales incentives are determined using the portfolio method. The Company also considers the customers’ rights of return in determining the transaction price where applicable. The Company allocates the transaction price to each performance obligation based on its relative standalone selling price and recognizes revenue as each performance obligation is satisfied. Judgment is required to determine the standalone selling price for each distinct performance obligation. The Company uses a range of selling prices to estimate standalone selling price when each of the products and services is sold separately. The Company typically has more than one standalone selling price for individual products and services due to the stratification of those products and services by customers and circumstances. In these instances, the Company may use information such as the size of the customer and geographic region in determining the standalone selling price. In instances where standalone selling price is not directly observable, such as when we do not sell the product or service separately, the Company determines the standalone selling price using information that may include market conditions and other observable inputs. Amounts billed to customers for shipping and handling activities are considered contract fulfillment activities and not a separate performance obligation of the contract. Shipping and handling fees are recorded as revenue and the related cost is a cost to fulfill the contract. Contract modifications are accounted for as separate contracts if the additional products and services are distinct and priced at standalone selling prices. If the additional products and services are distinct, but not priced at standalone selling prices, the modification is treated as a termination of the existing contract and the creation of a new contract. Lastly, if the additional products and services are not distinct within the context of the contract, the modification is combined with the original contract and either an increase or decrease in revenue is recognized on the modification date. During the three and nine months ended June 30, 2019 , the Company recognized revenue of $5 million for contracts modified during the period that had performance obligations satisfied in prior periods. Software The Company’s software licenses provide users with access to capabilities such as voice, video, conferencing, messaging and collaboration. Software licenses also add functionality to the Company’s hardware. The Company’s software licenses for on-premise customer software provide the customer with a right to use the software as it exists when it is made available to the customer and are accounted for as distinct performance obligations. The Company’s software licenses are sold through both direct and indirect channels with terms that are either perpetual or time based, both of which provide the end-user with the same functionality. The main difference between perpetual and term licenses is the duration over which the customer benefits from the software. Revenue from on-premise customer software licenses is generally recognized at the point-in-time the software is made available to the customer, via direct sale to the end-user or indirect sale to a channel partner, based on the fixed minimum revenue commitment under the arrangement. However, revenue cannot be recognized before the beginning of the period during which the customer can use and benefit from the license. In instances where the Company’s software licenses include a usage-based fee, revenue associated with the incremental usage is recognized at the point-in-time the incremental usage occurs. Hardware The Company’s hardware, phones, gateways, and servers, each of which has a stand-alone functionality, are generally considered distinct performance obligations. Hardware is sold through both direct and indirect channels and revenue is recognized at the point-in-time at which control of the product is transferred to the customer, via direct sale to the end-user or indirect sale to a channel partner, generally upon delivery, as defined in the contract. Global Support Services The Company’s global support services provide supplemental maintenance options to end-users in support of the Company’s products and solutions, including when and if available upgrade rights and maintenance for hardware. These services are typically accounted for as distinct performance obligations. Given that global support services consist of a series of distinct promises that are satisfied over time in the form of a single performance obligation comprised of a stand-ready obligation, these services are generally recognized ratably over the period during which the services are performed as customers simultaneously consume and receive benefits. Maintenance contracts typically have terms that range from one to five years. Professional Services The Company’s professional services include the design, implementation and development of communication solutions. Professional services are sold through the Company’s direct and indirect channels either on a stand-alone basis or with other hardware, software and services and are generally accounted for as distinct performance obligations. Revenue for professional services is generally recognized over time based on the cost of effort incurred to date relative to the total cost of effort expected to be incurred as customers simultaneously consume and receive benefits. Effort incurred generally represents work performed, which corresponds with, and thereby best depicts, the transfer of control to the customer. Contracts for professional services typically have terms that range from four to six weeks for simple engagements and from six months to one year for more complex engagements. Cloud and Managed Services The Company’s managed services provide additional support options to end-users on top of the Company’s supplemental maintenance services, including hardware support, help-desk routing and system monitoring services. The Company’s managed services are sold either on a stand-alone basis or together with the Company’s hardware, software and other services, and are generally accounted for as distinct performance obligations. The Company’s managed services are provided through both direct and indirect channels. Managed services consist of a series of distinct promises that are satisfied over time in the form of a single performance obligation comprised of a stand-ready obligation. Contracts for managed services typically have terms that range from one to five years. The Company’s cloud offerings enable customers to take advantage of our technology via the cloud, on-premises, or a hybrid of both. The software that enables the core communications functionality is offered both as a sale of perpetual or time based licenses or through a SaaS. Cloud offerings can include supplemental maintenance and managed services and are sold through the Company’s direct and indirect channels. Cloud and managed services offerings often include multiple performance obligations. Each performance obligation can itself include a series of distinct promises that are satisfied over time. Total consideration for a project is allocated to each performance obligation, with revenue recognized ratably over the period during which the services are performed as customers simultaneously consume and receive benefits. Variable consideration from incremental usage above a fixed fee is recognized at the point-in-time at which the usage occurs. Warranties The Company offers standard limited warranties that provide the customer with assurance that its products will function in accordance with contract specifications. The Company’s standard limited warranties are not sold separately but are included with each customer purchase. Warranties are not considered separate performance obligations, and therefore, warranty expense is accrued at the time the related revenue is recognized. Disaggregation of Revenue The following tables provide the Company's disaggregated revenue for the three and nine months ended June 30, 2019 : (In millions) Three months ended June 30, 2019 Nine months ended June 30, 2019 REVENUE Products & Solutions $ 298 $ 913 Services 422 1,269 Unallocated Amounts (3 ) (18 ) $ 717 $ 2,164 Three months ended June 30, 2019 (In millions) Products & Solutions Services Unallocated Total Revenue: U.S. $ 149 $ 245 $ (2 ) $ 392 International: Europe, Middle East and Africa 91 93 (1 ) 183 Asia Pacific 38 47 — 85 Americas International - Canada and Latin America 20 37 — 57 Total International 149 177 (1 ) 325 Total revenue $ 298 $ 422 $ (3 ) $ 717 Nine months ended June 30, 2019 (In millions) Products & Solutions Services Unallocated Total Revenue: U.S. $ 429 $ 744 $ (12 ) $ 1,161 International: Europe, Middle East and Africa 290 283 (3 ) 570 Asia Pacific 113 131 (2 ) 242 Americas International - Canada and Latin America 81 111 (1 ) 191 Total International 484 525 (6 ) 1,003 Total revenue $ 913 $ 1,269 $ (18 ) $ 2,164 Unallocated amounts represent the fair value adjustment to deferred revenue recognized upon emergence from bankruptcy and excluded from segment revenue. Transaction Price Allocated to the Remaining Performance Obligations Transaction price allocated to remaining performance obligations that are wholly or partially unsatisfied as of June 30, 2019 is $2.7 billion , of which 57% and 27% is expected to be recognized within 12 months and 13-24 months, respectively, with the remaining balance recognized thereafter. This excludes amounts for remaining performance obligations that are (1) for contracts recognized over time using the "right to invoice" practical expedient, (2) related to sales or usage based royalties promised in exchange for a license of intellectual property, and (3) related to variable consideration allocated entirely to a wholly unsatisfied performance obligation. Contract Balances The Company records a contract asset when revenue is recognized in advance of the right to bill, pursuant to customer contract terms. The contract asset decreases when the Company has the right to bill the customer which is generally triggered by the satisfaction of additional performance obligations or contract milestones. The Company records a contract liability when payment is received from the customer in advance of the Company satisfying a performance obligation and the contract liability is reduced as performance obligations are satisfied and revenue is recognized. The Company records the net contract asset or liability position for each customer contract. The following table provides information about accounts receivable, contract assets and contract liabilities for the periods presented: (In millions) June 30, 2019 October 1, 2018 Increase (Decrease) Accounts receivable, net $ 276 $ 376 $ (100 ) Contract assets: Current $ 178 $ 78 $ 100 Non-current (Other assets) 3 3 — $ 181 $ 81 $ 100 Cost of obtaining a contract: Current (Contract costs) $ 88 $ 64 $ 24 Non-current (Other assets) 44 36 8 $ 132 $ 100 $ 32 Cost to fulfill a contract: Current (Contract costs) $ 40 $ 45 $ (5 ) Contract liabilities: Current $ 470 $ 467 $ 3 Non-current (Other liabilities) 76 52 24 $ 546 $ 519 $ 27 The change in contract assets and contract liabilities primarily results from the timing difference between the Company’s satisfaction of a performance obligation and the timing of the payment from the customer. Accounts receivable are recorded when the customer has been billed or the right to consideration is unconditional. The Company recognizes a contract asset when it transfers products and services to a customer in advance of scheduled billings. Contract assets decrease when the Company invoices the customer or the right to receive consideration is unconditional. The Company did not record any asset impairment charges related to contract assets during the nine months ended June 30, 2019 . Contract liabilities are recorded when the Company receives payment from the customer in advance of the Company’s completion of performance obligation(s). During the three and nine months ended June 30, 2019 , the Company recognized revenue of $109 million and $505 million , respectively, that had been recorded as a Contract liability at October 1, 2018 . Contract Costs The Company capitalizes direct and incremental costs incurred to obtain and to fulfill a contract, such as sales commissions and products and services, respectively. These costs are recognized as an asset if the Company expects to recover them and are amortized consistent with the transfer to the customer of the underlying performance obligations. Costs to obtain a contract are amortized using the portfolio approach over the average term of the customer contracts, which corresponds to the period of benefit. Costs incurred to obtain a contract with an amortization period of one year or less are expensed as incurred, in accordance with the prescribed practical expedient. For the three months ended June 30, 2019 , the Company recognized $27 million for amortization of costs to obtain customer contracts, which was included in Selling, general and administrative expense. For the nine months ended June 30, 2019 , the Company recognized $73 million for amortization of costs to obtain customer contracts, of which $70 million was included in Selling, general and administrative expense and the remaining $3 million was a reduction to Revenue. Contract fulfillment costs are recognized consistent with the transfer to the customer of the underlying performance obligations based on the specific contracts to which they relate. For the three and nine months ended June 30, 2019 , the Company recognized $11 million and $31 million of contract fulfillment costs within Costs, respectively.

Business Combinations

Business Combinations	9 Months Ended
	Jun. 30, 2019
Business Acquisition [Line Items]
Investment [Text Block]	Strategic Investments On May 20, 2019, the Company made a $10 million investment in a unified communications as a service (“UCaaS”) provider delivering public sector Federal Risk and Authorization Management Program ("FedRAMP") security requirements (the “Strategic Investment”) through the acquisition of a 3-year convertible note (“Promissory Note”). The Strategic Investment offers hosted, cloud-based Voice over Internet Protocol infrastructure services and a FedRAMP authorized hosting platform. The Strategic Investment will use the proceeds from the issuance of the Promissory Note to help fund its working capital. The Promissory Note has a principal amount of $10 million , bears interest at a rate of 8% per annum and has a maturity date of May 20, 2022. Under the terms of the Promissory Note, the Company may, at its sole discretion, convert its interest in the Promissory Note into newly issued Class D units of the Strategic Investment representing no less than 27.3% of the Strategic Investment's fully diluted capitalization at the time of the conversion. On or after the Promissory Note’s maturity date, the Company shall have the option, at its sole discretion, to demand payment from the Strategic Investment for the unpaid principal and accrued interest on the Promissory Note. In conjunction with the Promissory Note, the Company entered into a separate agreement with the Strategic Investment and its equity holders which provides the Company with an option to purchase from such equity holders any or all of the outstanding LLC units of the Strategic Investment for prices specified in the relevant agreement. The option is exercisable upon the earlier of December 31, 2021 or the Strategic Investment reaching specified milestones. The option does not currently convey power to the Company as it is not currently exercisable and requires significant economic outlay. The Promissory Note is classified as an available-for-sale security as of June 30, 2019 with a carrying value and fair value of $10 million and is recorded within Other Assets in the Condensed Consolidated Balance Sheets. Although the Company maintains a variable interest in the Strategic Investment, it is not the primary beneficiary as it does not direct the activities that most significantly impact the economic performance of the Strategic Investment through the rights maintained with the Promissory Note or separate agreement. As of June 30, 2019 , the Company's maximum exposure to loss as a result of its involvement with the Strategic Investment is limited to the initial investment in the Promissory Note of $10 million .
Business Combination Disclosure [Text Block]	Business Combinations On March 9, 2018 (the "Acquisition Date"), the Company acquired Intellisist, Inc. ("Spoken"), a United States-based private technology company, which provides cloud-based Contact Center as a Service solutions and customer experience management and automation applications. The total purchase price was $172 million , consisting of $157 million in cash, $14 million in contingent consideration and a $1 million settlement of Spoken’s net payable to the Company which mainly related to services provided by the Company to Spoken under a co-development partnership prior to the acquisition. Upon the achievement of three specified performance targets ("Earn-outs"), the Company is required to pay up to $16 million of contingent consideration to Spoken's former owners and employees and up to $4 million in discretionary earn-out bonuses ("Earn-out Bonuses") to Spoken employees who have contributed to the achievement of the Earn-outs. The fair value of the Earn-outs at the Acquisition Date was $14 million , which was calculated using a probability-weighted discounted cash flow model and is remeasured to fair value at each subsequent reporting period. The Earn-out Bonuses, which are intended to incentivize continuing employees to assist in achieving the Earn-outs, are excluded from the acquisition consideration and are recognized as compensation expense in the Company's Condensed Consolidated Financial Statements ratably over the estimated Earn-out periods. During the nine months ended June 30, 2019 , the Company paid $11 million and $2 million for Earn-outs and Earn-out Bonuses, respectively, related to the achievement of two of the three Earn-out targets. The third Earn-out target was completed during the three months ended June 30, 2019 and the corresponding Earn-out and Earn-out Bonuses are expected to be paid by the Company during the remainder of fiscal 2019. As of June 30, 2019 , the fair value of the Earn-out liability was $5 million . In connection with this acquisition, the Company recorded goodwill of $117 million , which was assigned to the Products & Solutions segment, identifiable intangible assets with a fair value of $64 million , and other net liabilities of $9 million . The goodwill recognized is attributable primarily to the potential that the Spoken technology, cloud platform and assembled workforce will accelerate the Company's growth in cloud-based solutions. The Company determined that the goodwill is not deductible for tax purposes. The acquired intangible assets of $64 million included technology and patents of $56 million with a weighted average useful life of 4.9 years , $5 million of in-process research and development ("IPR&D") activities, which are considered indefinite lived until projects are completed or abandoned, and customer relationships of $3 million with a weighted average useful life of 7.5 years . During the nine months ended June 30, 2019 , $3 million of the acquired IPR&D activities have been completed and are being amortized over a weighted average useful life of 5.0 years and $2 million were abandoned and written off (see Note 5 ). Spoken became a wholly-owned subsidiary of the Company on March 9, 2018. The Company's Condensed Consolidated Financial Statements reflect the financial results of the operations of Spoken beginning on March 9, 2018. Spoken’s revenue and operating loss included in the Company’s results for the nine months ended June 30, 2019 , was $8 million and $21 million , respectively. The Company has finalized its purchase accounting for the Spoken acquisition.
Business Combinations	Business Combinations and Strategic Investments Business Combinations On March 9, 2018 (the "Acquisition Date"), the Company acquired Intellisist, Inc. ("Spoken"), a United States-based private technology company, which provides cloud-based Contact Center as a Service solutions and customer experience management and automation applications. The total purchase price was $172 million , consisting of $157 million in cash, $14 million in contingent consideration and a $1 million settlement of Spoken’s net payable to the Company which mainly related to services provided by the Company to Spoken under a co-development partnership prior to the acquisition. Upon the achievement of three specified performance targets ("Earn-outs"), the Company is required to pay up to $16 million of contingent consideration to Spoken's former owners and employees and up to $4 million in discretionary earn-out bonuses ("Earn-out Bonuses") to Spoken employees who have contributed to the achievement of the Earn-outs. The fair value of the Earn-outs at the Acquisition Date was $14 million , which was calculated using a probability-weighted discounted cash flow model and is remeasured to fair value at each subsequent reporting period. The Earn-out Bonuses, which are intended to incentivize continuing employees to assist in achieving the Earn-outs, are excluded from the acquisition consideration and are recognized as compensation expense in the Company's Condensed Consolidated Financial Statements ratably over the estimated Earn-out periods. During the nine months ended June 30, 2019 , the Company paid $11 million and $2 million for Earn-outs and Earn-out Bonuses, respectively, related to the achievement of two of the three Earn-out targets. The third Earn-out target was completed during the three months ended June 30, 2019 and the corresponding Earn-out and Earn-out Bonuses are expected to be paid by the Company during the remainder of fiscal 2019. As of June 30, 2019 , the fair value of the Earn-out liability was $5 million . In connection with this acquisition, the Company recorded goodwill of $117 million , which was assigned to the Products & Solutions segment, identifiable intangible assets with a fair value of $64 million , and other net liabilities of $9 million . The goodwill recognized is attributable primarily to the potential that the Spoken technology, cloud platform and assembled workforce will accelerate the Company's growth in cloud-based solutions. The Company determined that the goodwill is not deductible for tax purposes. The acquired intangible assets of $64 million included technology and patents of $56 million with a weighted average useful life of 4.9 years , $5 million of in-process research and development ("IPR&D") activities, which are considered indefinite lived until projects are completed or abandoned, and customer relationships of $3 million with a weighted average useful life of 7.5 years . During the nine months ended June 30, 2019 , $3 million of the acquired IPR&D activities have been completed and are being amortized over a weighted average useful life of 5.0 years and $2 million were abandoned and written off (see Note 5 ). Spoken became a wholly-owned subsidiary of the Company on March 9, 2018. The Company's Condensed Consolidated Financial Statements reflect the financial results of the operations of Spoken beginning on March 9, 2018. Spoken’s revenue and operating loss included in the Company’s results for the nine months ended June 30, 2019 , was $8 million and $21 million , respectively. The Company has finalized its purchase accounting for the Spoken acquisition. Strategic Investments On May 20, 2019, the Company made a $10 million investment in a unified communications as a service (“UCaaS”) provider delivering public sector Federal Risk and Authorization Management Program ("FedRAMP") security requirements (the “Strategic Investment”) through the acquisition of a 3-year convertible note (“Promissory Note”). The Strategic Investment offers hosted, cloud-based Voice over Internet Protocol infrastructure services and a FedRAMP authorized hosting platform. The Strategic Investment will use the proceeds from the issuance of the Promissory Note to help fund its working capital. The Promissory Note has a principal amount of $10 million , bears interest at a rate of 8% per annum and has a maturity date of May 20, 2022. Under the terms of the Promissory Note, the Company may, at its sole discretion, convert its interest in the Promissory Note into newly issued Class D units of the Strategic Investment representing no less than 27.3% of the Strategic Investment's fully diluted capitalization at the time of the conversion. On or after the Promissory Note’s maturity date, the Company shall have the option, at its sole discretion, to demand payment from the Strategic Investment for the unpaid principal and accrued interest on the Promissory Note. In conjunction with the Promissory Note, the Company entered into a separate agreement with the Strategic Investment and its equity holders which provides the Company with an option to purchase from such equity holders any or all of the outstanding LLC units of the Strategic Investment for prices specified in the relevant agreement. The option is exercisable upon the earlier of December 31, 2021 or the Strategic Investment reaching specified milestones. The option does not currently convey power to the Company as it is not currently exercisable and requires significant economic outlay. The Promissory Note is classified as an available-for-sale security as of June 30, 2019 with a carrying value and fair value of $10 million and is recorded within Other Assets in the Condensed Consolidated Balance Sheets. Although the Company maintains a variable interest in the Strategic Investment, it is not the primary beneficiary as it does not direct the activities that most significantly impact the economic performance of the Strategic Investment through the rights maintained with the Promissory Note or separate agreement. As of June 30, 2019 , the Company's maximum exposure to loss as a result of its involvement with the Strategic Investment is limited to the initial investment in the Promissory Note of $10 million .

Supplementary Financial Informa

Supplementary Financial Information	9 Months Ended
	Jun. 30, 2019
Supplementary Financial Information [Abstract]
Supplementary Financial Information	Supplementary Financial Information Condensed Consolidated Statements of Operations Information The following table presents a summary of Other income (expense), net for the periods indicated: Successor Predecessor (In millions) Three months ended Three months ended Nine months ended Period from December 16, 2017 Period from OTHER INCOME (EXPENSE), NET Interest income $ 4 $ 1 $ 11 $ 2 $ 2 Foreign currency (losses) gains, net (1 ) 25 (8 ) 24 — Income from transition services agreement, net — 1 — 5 3 Other pension and post-retirement benefit credits (costs), net 1 4 5 9 (8 ) Change in fair value of emergence date warrants 7 6 28 (9 ) — Other, net 1 — (1 ) 1 1 Total other income (expense), net $ 12 $ 37 $ 35 $ 32 $ (2 ) A summary of Reorganization items, net for the periods indicated is presented in the following table: Predecessor (In millions) Period from REORGANIZATION ITEMS, NET Net gain on settlement of Liabilities subject to compromise $ 1,778 Net gain on fresh start adjustments 1,697 Bankruptcy-related professional fees (56 ) Other items, net (3 ) Reorganization items, net $ 3,416 Cash payments for reorganization items $ 2,524 Costs directly attributable to the implementation of the Plan of Reorganization were reported as Reorganization items, net. The cash payments for reorganization items for the period from October 1, 2017 through December 15, 2017 (Predecessor) included $2,468 million of claims paid related to Liabilities subject to compromise and $56 million for bankruptcy-related professional fees, including emergence and success fees paid on the Emergence Date. Supplemental Cash Flow Information Successor Predecessor (In millions) Three months ended Three months ended Nine months ended Period from December 16, 2017 Period from OTHER PAYMENTS Interest payments $ 61 $ 52 $ 160 $ 99 $ 15 Income tax payments 13 8 48 17 7 NON-CASH INVESTING ACTIVITIES (Decrease) increase in Accounts payable for Capital expenditures $ (6 ) $ 5 $ (1 ) $ 5 $ — The following table presents a reconciliation of cash, cash equivalents, and restricted cash that sum to the total of the same such amounts shown in the Condensed Consolidated Statements of Cash Flows for the periods presented: Successor Predecessor (In millions) June 30, September 30, 2018 June 30, 2018 December 15, 2017 September 30, 2017 CASH, CASH EQUIVALENTS, AND RESTRICTED CASH Cash and cash equivalents $ 729 $ 700 $ 685 $ 366 $ 876 Restricted cash included in other current assets — — 10 65 85 Restricted cash included in other assets 5 4 4 4 5 Total cash, cash equivalents, and restricted cash $ 734 $ 704 $ 699 $ 435 $ 966 As of June 30, 2018 (Successor), restricted cash in other current assets consisted primarily of funds held related to the sale of the Company's Networking business in July 2017. As of December 15, 2017 (Predecessor), restricted cash in other current assets consisted primarily of funds held for bankruptcy-related professional fees. As of September 30, 2017 (Predecessor), restricted cash in other current assets consisted primarily of cash that was drawn from term loans under the Debtor-in-Possession credit agreement to cash collateralize existing letters of credit.

Business Restructuring Reserves

Business Restructuring Reserves and Programs	9 Months Ended
	Jun. 30, 2019
Restructuring Reserve [Abstract]
Business Restructuring Reserves and Programs	Business Restructuring Reserves and Programs For the three months ended June 30, 2019 and 2018 (Successor), the Company recognized restructuring charges of $1 million and $30 million , respectively. For the nine months ended June 30, 2019 (Successor), the period from December 16, 2017 through June 30, 2018 (Successor) and the period from October 1, 2017 through December 15, 2017 (Predecessor), the Company recognized restructuring charges of $12 million , $80 million and $14 million , respectively. The restructuring charges include changes in estimates for increases and decreases in costs or changes in the timing of payments related to the restructuring programs of prior fiscal years. The Company's restructuring charges generally include separation charges which include, but are not limited to, termination payments, pension fund payments, and health care and unemployment insurance costs to be paid to, or on behalf of, the affected employees; and lease obligation charges. As the Company continues to evaluate opportunities to streamline its operations, it may identify cost savings globally and take additional restructuring actions in the future and the costs of those actions could be material. The Company does not allocate restructuring reserves to its operating segments. Fiscal 2019 Restructuring Program Recognized restructuring charges for the fiscal 2019 restructuring program included employee separation costs associated with employee severance actions primarily in the U.S., Europe, Middle East and Africa ("EMEA") and Canada, for which the related payments are expected to be completed by fiscal 2021 . The following table summarizes the components of the fiscal 2019 restructuring program for the nine months ended June 30, 2019 : (In millions) Employee Separation Costs Lease Obligations Total Restructuring charges $ 10 $ 2 $ 12 Cash payments (5 ) — (5 ) Impact of foreign currency fluctuations (1 ) — (1 ) Accrual balance as of June 30, 2019 $ 4 $ 2 $ 6 Fiscal 2018 Restructuring Program Fiscal 2018 restructuring obligations include employee separation costs associated with employee severance actions primarily in EMEA, for which the related payments are expected to be completed by fiscal 2026 . The following table summarizes the components of the fiscal 2018 restructuring program for the nine months ended June 30, 2019 : (In millions) Employee Separation Costs Lease Obligations Total Accrual balance as of September 30, 2018 $ 54 $ — $ 54 Adjustments (1) (1 ) — (1 ) Cash payments (15 ) — (15 ) Impact of foreign currency fluctuations (1 ) — (1 ) Accrual balance as of June 30, 2019 $ 37 $ — $ 37 (1) Includes changes in estimates for increases and decreases in costs related to the fiscal 2018 restructuring program, which are recorded in Restructuring charges, net in the Consolidated Statements of Operations in the period of the adjustment. Fiscal 2008 through 2017 Restructuring Programs These obligations are primarily for costs associated with eliminating employee positions and exiting facilities. The payments related to the headcount reductions identified in these programs are expected to be substantially completed by fiscal 2026 . Future rental payments, net of estimated sublease income, related to operating lease obligations for unused space in connection with the closing or consolidation of facilities are expected to continue through fiscal 2021 . The following table aggregates the remaining components of the fiscal 2008 through 2017 restructuring programs for the nine months ended June 30, 2019 : (In millions) Employee Separation Costs Lease Obligations Total Accrual balance as of September 30, 2018 $ 38 $ 6 $ 44 Adjustments (1) 1 — 1 Cash payments (12 ) (2 ) (14 ) Impact of foreign currency fluctuations (1 ) — (1 ) Accrual balance as of June 30, 2019 $ 26 $ 4 $ 30 (1) Includes changes in estimates for increases and decreases in costs related to the fiscal 2008 through 2017 restructuring programs, which are recorded in Restructuring charges, net in the Consolidated Statements of Operations in the period of the adjustment.

Financing Arrangements

Financing Arrangements	9 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Financing Arrangements	Financing Arrangements The following table reflects principal amounts of debt and debt net of discounts and issuance costs for the periods presented: June 30, 2019 September 30, 2018 (In millions) Principal amount Net of discounts and issuance costs Principal amount Net of discounts and issuance costs Term Loan Credit Agreement due December 15, 2024 $ 2,881 $ 2,852 $ 2,903 $ 2,870 Convertible 2.25% senior notes due June 15, 2023 350 268 350 256 Total debt $ 3,231 3,120 $ 3,253 3,126 Debt maturing within one year (29 ) (29 ) Long-term debt, net of current portion $ 3,091 $ 3,097 Term Loan and ABL Credit Agreements On December 15, 2017 , Avaya Inc. entered into (i) the Term Loan Credit Agreement among Avaya Inc., as borrower, Avaya Holdings, the lending institutions from time to time party thereto, and Goldman Sachs Bank USA, as administrative agent and collateral agent, which provided a $2,925 million term loan facility maturing on December 15, 2024 (the "Term Loan Credit Agreement") and (ii) the ABL Credit Agreement maturing on December 15, 2022 , among Avaya Inc., as borrower, Avaya Holdings, the several other borrowers party thereto, the several lenders from time to time party thereto, and Citibank, N.A., as administrative agent and collateral agent, which provided a revolving credit facility consisting of a U.S. tranche and a foreign tranche allowing for borrowings of up to an aggregate principal amount of $300 million from time to time, subject to borrowing base availability (the "ABL Credit Agreement" and, together with the Term Loan Credit Agreement, the "Credit Agreements"). On June 18, 2018, the Company amended the Term Loan Credit Agreement to reduce interest rates and to reduce the London Inter-bank Offered Rate ("LIBOR") floor that existed under the original agreement from 1.00% to 0.00% . For the three months ended June 30, 2019 and 2018 , the nine months ended June 30, 2019 and the period from December 16, 2017 through June 30, 2018 , the Company recognized interest expense of $51 million , $50 million , $151 million and $106 million , respectively, related to the Term Loan Credit Agreement, including the amortization of discounts and issuance costs. Under the terms of the ABL Credit Agreement, the Company can issue letters of credit up to $150 million . At June 30, 2019 , the Company had issued and outstanding letters of credit and guarantees of $45 million under the ABL Credit Agreement. As of June 30, 2019 , the Company had no borrowings outstanding under the ABL. The aggregate additional principal amount that may be borrowed under the ABL Credit Agreement, based on the borrowing base less $45 million of outstanding letters of credit and guarantees, was $139 million at June 30, 2019 . For the nine months ended June 30, 2019, the Company recognized interest expense of $1 million related to the ABL Credit Agreement resulting from the unused commitment fee. For the three months ended June 30, 2019 , the three months ended June 30, 2018 , and the period from December 16, 2017 through June 30, 2018 , interest expense recognized related to the ABL Credit Agreement was not material. Convertible Notes On June 11, 2018, the Company issued its 2.25% Convertible Notes in an aggregate principal amount of $350 million (including the underwriters’ exercise in full of an over-allotment option of $50 million ), which mature on June 15, 2023 (the "Convertible Notes"). The Convertible Notes were issued under an indenture, by and between the Company and the Bank of New York Mellon Trust Company N.A., as Trustee. For the three and nine months ended June 30, 2019 , the Company recognized interest expense of $6 million and $18 million related to the Convertible Notes, which includes $4 million and $12 million of amortization of the underwriting discount and issuance costs, respectively. For the three months ended June 30, 2018 and the period from December 16, 2017 through June 30, 2018 , the Company recognized interest expense of $1 million related to the Convertible Notes, which mainly consisted of amortization of the underwriting discount. The net carrying amount of the Convertible Notes for the periods indicated was as follows: (In millions) June 30, 2019 September 30, 2018 Principal $ 350 $ 350 Less: Unamortized debt discount (76 ) (87 ) Unamortized issuance costs (6 ) (7 ) Net carrying amount $ 268 $ 256 The weighted average contractual interest rate of the Company’s outstanding debt as of June 30, 2019 and September 30, 2018 was 6.5% and 6.4% , respectively. The effective interest rate for the Term Loan Credit Agreement as of June 30, 2019 was not materially different than its contractual interest rate including adjustments related to hedging. The effective interest rate for the Convertible Notes as of June 30, 2019 was 9.2% reflecting the separation of the conversion feature in equity. The effective interest rates include interest on the debt and amortization of discounts and issuance costs. For the period from October 1, 2017 through December 15, 2017 (Predecessor), contractual interest expense of $94 million was not recorded as interest expense, as it was not an allowed claim under the Bankruptcy Filing. As of June 30, 2019 , the Company was not in default under any of its debt agreements. Capital Lease Obligations Included in Other liabilities is $20 million and $31 million of capital lease obligations, net of imputed interest as of June 30, 2019 and September 30, 2018 , respectively. The Company outsources certain delivery services associated with its Enterprise Cloud and Managed Services, which include the sale of specified assets owned by the Company that are leased-back by the Company and accounted for as a capital lease. As of June 30, 2019 and September 30, 2018 , capital lease obligations associated with this agreement were $16 million and $26 million , respectively.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	9 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	The Company accounts for derivative financial instruments in accordance with FASB ASC Topic 815, "Derivatives and Hedging," ("ASC 815") and does not enter into derivatives for trading or speculative purposes. Interest Rate Contracts The Company, from time-to-time, enters into interest rate swap contracts as a hedge against changes in interest rates on its variable rate loans outstanding. On May 16, 2018, the Company entered into interest rate swap agreements with six counterparties, which fixed a portion of the variable interest due under its Term Loan Credit Agreement (the "Swap Agreements"). Under the terms of the Swap Agreements, which mature on December 15, 2022 , the Company pays a fixed rate of 2.935% and receives a variable rate of interest based on one-month LIBOR. As of June 30, 2019 , the total notional amount of the six Swap Agreements was $1,800 million . The Swap Agreements are designated as cash flow hedges as they are deemed highly effective as defined under ASC 815. As a result, the unrealized gains or losses on these contracts are initially recorded in Accumulated other comprehensive (loss) income in the Condensed Consolidated Balance Sheets. As interest expense is recognized on the Term Loan Credit Agreement, the corresponding deferred gain or loss on the Swap Agreements is reclassified from Accumulated other comprehensive (loss) income to Interest expense in the Condensed Consolidated Statements of Operations. Based on the amount in Accumulated other comprehensive (loss) income at June 30, 2019 , approximately $20 million would be reclassified into net income in the next twelve months as interest expense. It is management's intention that the notional amount of interest rate swaps be less than the variable rate loans outstanding during the life of the derivatives. Foreign Currency Forward Contracts The Company, from time-to-time, utilizes foreign currency forward contracts primarily to hedge fluctuations associated with certain monetary assets and liabilities including receivables, payables and certain intercompany obligations. These foreign currency forward contracts are not designated for hedge accounting treatment. As a result, changes in the fair value of these contracts are recorded as a component of Other income (expense), net to offset the change in the value of the hedged assets and liabilities. As of June 30, 2019 , the Company maintained open foreign currency forward contracts with a total notional value of $355 million , hedging the British Pound Sterling, Indian Rupee, Czech Koruna, Australian Dollar and Mexican Peso. The Company did not maintain any foreign currency forward contracts as of June 30, 2018 . Emergence Date Warrants In accordance with the Plan of Reorganization, the Company issued warrants to purchase 5,645,200 shares of Company common stock to the holders of the Predecessor second lien obligations pursuant to a warrant agreement ("Emergence Date Warrants"). Each Emergence Date Warrant has an exercise price of $25.55 per share and expires December 15, 2022 . The Emergence Date Warrants contain certain derivative features that require them to be classified as a liability and for changes in the fair value of the liability to be recognized in earnings each reporting period. On November 14, 2018, the Company's Board of Directors approved a warrant repurchase program, authorizing the Company to repurchase up to $15 million worth of the Emergence Date Warrants. None of the Emergence Date Warrants have been exercised or repurchased as of June 30, 2019 . The fair value of the Emergence Date Warrants was determined using a probability weighted Black-Scholes option pricing model. This model requires certain input assumptions including risk-free interest rates, volatility, expected life and dividend rates. Selection of these inputs involves significant judgment. The fair value of the Emergence Date Warrants as of June 30, 2019 and September 30, 2018 was determined using the input assumptions summarized below: June 30, 2019 September 30, 2018 Expected volatility 57.56 % 50.14 % Risk-free interest rates 1.71 % 2.90 % Contractual remaining life (in years) 3.46 4.21 Price per share of common stock $11.91 $22.14 In determining the fair value of the Emergence Date Warrants, the dividend yield was assumed to be zero as the Company does not anticipate paying dividends. The following table summarizes the fair value of the Company's derivatives on a gross basis segregated between those that are designated as hedging instruments and those that are not designated as hedging instruments: June 30, 2019 September 30, 2018 (In millions) Balance Sheet Caption Asset Liability Asset Liability Derivatives Designated as Hedging Instruments: Interest rate contracts Other assets $ — $ — $ 3 $ — Interest rate contracts Other current liabilities — 19 — 7 Interest rate contracts Other liabilities — 56 — — — 75 3 7 Derivatives Not Designated as Hedging Instruments: Foreign exchange contracts Other current assets 2 — — — Emergence Date Warrants Other liabilities — 6 — 34 2 6 — 34 Total derivative fair value $ 2 $ 81 $ 3 $ 41 The following tables provide information regarding the location and amount of pre-tax losses for derivatives designated as cash flow hedges: Three months ended Three months ended (In millions) Interest Expense Other Comprehensive (Loss) Income Interest Expense Other Comprehensive (Loss) Income Financial Statement Line Item in which Cash Flow Hedges are Recorded $ (59 ) $ (38 ) $ (56 ) $ (16 ) Impact of cash flow hedging relationships: Loss recognized in AOCI - on interest rate swaps — (31 ) — (17 ) Interest expense from AOCI reclassified (2 ) 2 (2 ) 2 Successor Predecessor Nine months ended June 30, 2019 Period from December 16, 2017 Period from (In millions) Interest Expense Other Comprehensive (Loss) Income Interest Expense Other Comprehensive (Loss) Income Interest Expense Other Comprehensive (Loss) Income Financial Statement Line Item in which Cash Flow Hedges are Recorded $ (177 ) $ (50 ) $ (112 ) $ (41 ) $ (14 ) $ 658 Impact of cash flow hedging relationships: Loss recognized in AOCI - on interest rate swaps — (78 ) — (17 ) $ — $ — Interest expense from AOCI reclassified (7 ) 7 (2 ) 2 $ — $ — The following table provides information regarding the pre-tax gains (losses) for derivatives not designated as hedging instruments on the Condensed Consolidated Statements of Operations: Successor Predecessor Three months ended Three months ended Nine months ended June 30, 2019 Period from December 16, 2017 Period from (In millions) Location of Derivative Pre-tax Gain (Loss) Emergence Date Warrants Other income (expense), net $ 7 $ 6 $ 28 $ (9 ) $ — Foreign exchange contracts Other income (expense), net (1 ) — (1 ) — — The Company records its derivatives on a gross basis in the Condensed Consolidated Balance Sheets. The Company has master netting agreements with several of its financial institution counterparties. The following table provides information on the Company's derivative positions as if those subject to master netting arrangements were presented on a net basis, allowing for the right to offset by counterparty per the master netting agreements: June 30, 2019 September 30, 2018 (In millions) Asset Liability Asset Liability Gross amounts recognized in the Condensed Consolidated Balance Sheet $ 2 $ 81 $ 3 $ 41 Gross amount subject to offset in master netting arrangements not offset in the Condensed Consolidated Balance Sheet (2 ) (2 ) (3 ) (3 ) Net amounts $ — $ 79 $ — $ 38

Intangible Assets

Intangible Assets	9 Months Ended
	Jun. 30, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible Assets	5 . Goodwill, net and Intangible Assets, net Goodwill, net The changes in the carrying amount of goodwill by segment during fiscal 2019 were as follows: (In millions) Products & Solutions Services Total Balance as of September 30, 2018 $ 1,283 $ 1,481 $ 2,764 Impairment charges (657 ) — (657 ) Other — (2 ) (2 ) Balance as of June 30, 2019 $ 626 $ 1,479 $ 2,105 Goodwill is not amortized but is subject to periodic testing for impairment in accordance with GAAP at the reporting unit level, which is one level below the Company’s operating segments. The Company has five reporting units, all of which are subject to impairment testing annually or more frequently if events occur or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company's goodwill was primarily recorded upon emergence from bankruptcy as a result of applying fresh start accounting. The Company concluded that triggering events occurred for all of its reporting units as of June 30, 2019 due to a sustained decrease in the Company’s stock price and lower than planned financial results which led to revisions to the Company's long-term forecast during the third quarter of fiscal 2019. As a result, the Company performed an interim quantitative goodwill impairment test as of June 30, 2019 to compare the fair values of its reporting units to their respective carrying amounts, including the goodwill allocated to each reporting unit. The Company estimated the fair value of each reporting unit using a weighting of fair values derived from an income and a market approach. Under the income approach, the fair value of a reporting unit is based on the future cash flows expected from that reporting unit. Future cash flows are based on forward-looking information regarding revenue and costs for each reporting unit and are discounted using an appropriate discount rate in a discounted cash flows model. The discounted cash flows model relies on assumptions regarding revenue growth rates, gross profit, projected working capital needs, selling, general and administrative expenses, research and development expenses, business restructuring costs, capital expenditures, income tax rates, discount rates and terminal growth rates. The discount rates the Company used represent the estimated weighted average cost of capital, which reflects the overall level of inherent risk involved in its reporting unit operations and the rate of return an outside investor would expect to earn. To estimate cash flows beyond the final year of its model, the Company used a terminal value approach. Under this approach, the Company applied a perpetuity growth assumption to determine the terminal value. The Company incorporated the present value of the resulting terminal value into its estimate of fair value. Forecasted cash flows for each reporting unit consider current economic conditions and trends, estimated future operating results, the Company’s view of growth rates and anticipated future economic conditions. Revenue growth rates inherent in this forecast are based on input from internal and external market intelligence research sources that compare factors such as growth in global economies, regional trends in the telecommunications industry and product evolution from a technological segment basis. Macroeconomic factors such as changes in economies, product evolutions, industry consolidations and other changes beyond the Company’s control could have a positive or negative impact on achieving its targets. The market approach estimates the fair value of a reporting unit by applying multiples of operating performance measures to the reporting unit's operating performance (the "Guideline Public Company Method"). These multiples were derived from comparable publicly-traded companies with similar investment characteristics to the reporting unit. The key estimates and assumptions that were used to determine the fair value under this market approach include current and forward 12-month operating performance results, as applicable, and the selection of the relevant multiples that were applied. The results of the Company’s interim goodwill impairment test as of June 30, 2019 indicated that the estimated fair values of the Company’s Unified Communications (“UC”), Global Support Services (“GSS”), Avaya Professional Services (“APS”) and Enterprise Cloud and Managed Solutions (“ECMS”) reporting units were greater than their carrying amounts, however, the carrying amount of the Company’s Contact Center ("CC") reporting unit within the Products & Solutions segment exceeded its estimated fair value primarily due to a reduction in the Company's long-term forecast. As a result, the Company recorded a goodwill impairment charge of $657 million , representing the amount by which the carrying amount of the CC reporting unit exceeded its fair value. As of June 30, 2019 , the remaining carrying amount of goodwill for the CC reporting unit was $197 million . As of June 30, 2019 , the fair value of the UC, APS and ECMS reporting units exceeded their carrying amounts by more than 10%, however, the GSS reporting unit had an excess fair value over its carrying value of 7% . The goodwill assigned to GSS is $1,446 million . An increase in the GSS discount rate of 65 basis points or a decrease in the GSS long-term growth rate of 95 basis points used in the interim goodwill impairment test as of June 30, 2019 would result in an estimated fair value below its carrying value. To the extent that business conditions deteriorate further or if changes in key assumptions and estimates differ significantly from management’s expectations, it may be necessary to record additional impairment charges in the future. Intangible Assets, net The Company's intangible assets consist of the following for the periods indicated: (In millions) Customer Trademarks Total Balance as of June 30, 2019 Finite-lived intangible assets: Cost $ 961 $ 2,156 $ 42 $ 3,159 Accumulated amortization (265 ) (240 ) (9 ) (514 ) Finite-lived intangible assets, net 696 1,916 33 2,645 Indefinite-lived intangible assets: Cost 2 — 333 335 Accumulated impairment (2 ) — — (2 ) Indefinite-lived intangible assets, net — — 333 333 Intangible assets, net $ 696 $ 1,916 $ 366 $ 2,978 Balance as of September 30, 2018 Finite-lived intangible assets: Cost $ 959 $ 2,157 $ 43 $ 3,159 Accumulated amortization (135 ) (124 ) (3 ) (262 ) Finite-lived intangible assets, net 824 2,033 40 2,897 Indefinite-lived intangible assets 5 — 332 337 Intangible assets, net $ 829 $ 2,033 $ 372 $ 3,234 Intangible assets include technology and patents, customer relationships, and trademarks and trade names. Intangible assets with finite lives are amortized using the straight-line method over the estimated economic lives of the assets. Intangible assets with finite lives are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Intangible assets determined to have indefinite useful lives are not amortized but are tested for impairment annually and more frequently if events occur or circumstances change that indicate an asset may be impaired. During the three months ended June 30, 2019 , the Company elected to abandon an in-process research and development project acquired with Spoken (see Note 4 ) since it no longer aligned with the Company’s technology roadmap. As a result, the Company recorded an impairment charge of $2 million to write down the full carrying amount. As a result of the goodwill triggering events described above, the Company performed a recoverability test on all of its finite-lived asset groups as of June 30, 2019 before proceeding to the goodwill impairment review and concluded that no impairment charge was necessary. The recoverability test of finite-lived assets was based on forecasts of undiscounted cash flows for each asset group. The Company also performed an interim quantitative impairment test for its indefinite-lived intangible asset, the Avaya Trade Name, as of June 30, 2019. The Avaya Trade Name was evaluated for impairment using the relief-from-royalty method. Under this methodology, the fair value of the trade name was determined by applying a royalty rate to forecasted net revenues and discounted using a risk-adjusted rate of capital. Revenue growth rates inherent in the forecast were based on input from internal and external market intelligence research sources that compare factors such as growth in global economies, regional trends in the telecommunications industry and product evolution from a technological segment basis. The royalty rate was determined using a set of observed market royalty rates. The result of the impairment test as of June 30, 2019 indicated that the estimated fair value of the trade name exceeded its carrying amount by more than 10% and no impairment existed. To the extent that business conditions deteriorate further or if changes in key assumptions and estimates differ significantly from management’s expectations, it may be necessary to record additional impairment charges in the future. The total goodwill and intangible asset impairment charges described above of $659 million are presented in the Impairment charges line item in the Condensed Consolidated Statement of Operations.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Pursuant to the accounting guidance for fair value measurements, fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and it considers assumptions that market participants would use when pricing the asset or liability. Fair Value Hierarchy The accounting guidance for fair value measurements also requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The inputs are prioritized into three levels that may be used to measure fair value: Level 1: Inputs that reflect quoted prices for identical assets or liabilities in active markets that are observable. Level 2: Inputs that reflect quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or model-derived valuations in which significant inputs are observable or can be derived principally from, or corroborated by, observable market data. Level 3: Inputs that are unobservable to the extent that observable inputs are not available for the asset or liability at the measurement date. Assets and Liabilities Measured at Fair Value on a Recurring Basis Assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and September 30, 2018 were as follows: June 30, 2019 September 30, 2018 Fair Value Measurements Using Fair Value Measurements Using (In millions) Total Level 1 Level 2 Level 3 Total Level 2 Level 3 Assets: Strategic investments $ 10 $ — $ — $ 10 $ — $ — $ — $ — Other investments — — — — 2 2 — — Interest rate contracts — — — — 3 — 3 — Foreign exchange contracts 2 — 2 — — — — — Total assets $ 12 $ — $ 2 $ 10 $ 5 $ 2 $ 3 $ — Liabilities: Interest rate contracts $ 75 $ — $ 75 $ — $ 7 $ — $ 7 $ — Spoken acquisition Earn-outs 5 — — 5 15 — — 15 Emergence Date Warrants 6 — — 6 34 — — 34 Total liabilities $ 86 $ — $ 75 $ 11 $ 56 $ — $ 7 $ 49 Strategic investments The Strategic Investment is valued using a discounted cash flow model which includes various unobservable inputs including cash flow projections, long-term growth rates, discount rates, and market comparable companies. The Strategic Investment is recorded in Other assets in the Condensed Consolidated Balance Sheets. Other investments Other investments classified as Level 1 assets are priced using quoted market prices for identical assets in active markets that are observable. Other investments are recorded in Other assets in the Condensed Consolidated Balance Sheets. Interest rate and foreign exchange contracts Interest rate and foreign exchange contracts classified as Level 2 assets and liabilities are not actively traded and are valued using pricing models that use observable inputs. Spoken acquisition Earn-outs The Spoken acquisition Earn-outs classified as Level 3 liabilities are measured using a probability-weighted discounted cash flow model. Significant unobservable inputs, which included probability of the achievement of the earn out targets and discount rate assumption, reflected the assumptions market participants would use in valuing these liabilities. Emergence Date Warrants Emergence Date Warrants classified as Level 3 liabilities are priced using the Black-Scholes option pricing model. During the three months ended June 30, 2019 and 2018 (Successor), the nine months ended June 30, 2019 (Successor), the period from December 16, 2017 through June 30, 2018 (Successor) and the period from October 1, 2017 through December 15, 2017 (Predecessor), there were no transfers between Level 1 and Level 2, or into and out of Level 3. The following table summarizes the activity for the Company's Level 3 liabilities measured at fair value on a recurring basis: (In millions) Emergence Date Warrants Spoken Acquisition Earn-outs Strategic Investments Total Balance as of September 30, 2018 $ 34 $ 15 $ — $ 49 Strategic investments — — 10 10 Change in fair value (1) (28 ) 1 — (27 ) Settlement — (11 ) — (11 ) Balance as of June 30, 2019 $ 6 $ 5 $ 10 $ 21 (1) Changes in fair value of the Emergence Date Warrants are included in Other income (expense), net. Changes in fair value of the Spoken acquisition Earn-outs are included in Selling, general and administrative expense. Fair Value of Financial Instruments The fair values of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses, to the extent the underlying liability will be settled in cash, approximate their carrying values because of the short-term nature of these instruments. As of June 30, 2019 and September 30, 2018 , the estimated fair value of the Convertible Notes was determined based on the quoted price of the Convertible Notes in an inactive market on the last trading day of the reporting period and has been classified as Level 2. The estimated fair values of amounts borrowed under the Company's other financing arrangements at June 30, 2019 and September 30, 2018 were estimated based on a Level 2 input based on a market approach utilizing market-clearing data on the valuation date in addition to bid/ask prices. The estimated fair values of the amounts borrowed under the Company’s financing agreements at June 30, 2019 and September 30, 2018 are as follows: June 30, 2019 September 30, 2018 (In millions) Principal amount Fair value Principal amount Fair value Term Loan Credit Agreement due December 15, 2024 $ 2,881 $ 2,764 $ 2,903 $ 2,932 Convertible 2.25% senior notes due June 15, 2023 350 305 350 357 Total debt $ 3,231 $ 3,069 $ 3,253 $ 3,289

Income Taxes

Income Taxes	9 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Income Taxes	Income Taxes The Company's effective income tax rate for the three and nine months ended June 30, 2019 differed from the U.S. federal tax rate primarily due to: (1) income and losses taxed at different foreign tax rates, (2) losses generated within certain foreign jurisdictions for which no benefit was recorded because it is more likely than not that the tax benefits would not be realized, (3) non-U.S. withholding taxes on foreign earnings, (4) current period changes to unrecognized tax positions, (5) U.S. state and local income taxes, (6) the impact of the Tax Cuts and Jobs Act ("the Act"), (7) the goodwill impairment charges recorded in the third quarter of fiscal 2019, (8) current period elections taken in submitted tax filings, and (9) foreign tax credits. The Company's effective income tax rate for the three months ended June 30, 2018 differed from the U.S. federal tax rate primarily due to: (1) income and losses taxed at different foreign tax rates, (2) losses generated within certain foreign jurisdictions for which no benefit was recorded because it is more likely than not that the tax benefits would not be realized, (3) non-U.S. withholding taxes on foreign earnings, (4) current period changes to unrecognized tax positions, (5) U.S. state and local income taxes, (6) the impact of the Act, and (7) foreign tax credits. The Company's effective income tax rate for the period from December 16, 2017 through June 30, 2018 (Successor) differed from the U.S. federal tax rate primarily due to: (1) income and losses taxed at different foreign tax rates, (2) losses generated within certain foreign jurisdictions for which no benefit was recorded because it is more likely than not that the tax benefits would not be realized, (3) non-U.S. withholding taxes on foreign earnings, (4) current period changes to unrecognized tax positions, (5) U.S. state and local income taxes, (6) an increase in estimated current year tax loss, which is eliminated as part of the attribute reduction related to the cancellation of indebtedness income ("CODI"), and (7) the impact of the Act. The Company's effective income tax rate for the period from October 1, 2017 through December 15, 2017 (Predecessor) differed from the U.S. federal tax rate primarily due to: (1) income and losses taxed at different foreign tax rates, (2) losses generated within certain foreign jurisdictions for which no benefit was recorded because it is more likely than not that the tax benefits would not be realized, (3) non-U.S. withholding taxes on foreign earnings, (4) current period changes to unrecognized tax positions, (5) U.S. state and local taxes, and (6) the impact of reorganization and fresh start adjustments. During fiscal 2018 , the Company centralized the management and ownership of certain intellectual property in a U.S. limited partnership, some of which was previously managed and owned by a Bermuda tax resident corporation. This action resulted in the utilization and recognition of previously unrecognized NOLs, the reversal of deferred tax liabilities established as part of fresh start accounting and the recognition of a deferred tax asset, cumulatively in the amount of $366 million . The Company's U.S. federal net operating loss ("NOL") and tax credits have been eliminated due to the recognition of CODI in fiscal 2018. On December 22, 2017, the Act was signed into law. The Act lowered the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018. The Company has a September 30th tax year-end and therefore many of the tax law changes became effective in the first quarter of fiscal 2019 . The Company has made a policy decision to treat Global Intangible Low-Taxed Income (“GILTI”) as a period cost. The Company benefits from the deduction attributable to Foreign Derived Intangible Income (“FDII”) and has taxable income attributable to GILTI, both of which impact the effective tax rate. During the three months ended December 31, 2018, Avaya completed its analysis of the impact of the Act as required by Staff Accounting Bulletin No. 118 issued by the SEC on December 22, 2017.

Benefit Obligations

Benefit Obligations	9 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Benefit Obligations	Benefit Obligations The Company sponsors non-contributory defined benefit pension plans covering a portion of its U.S. employees and retirees, and post-retirement benefit plans covering a portion of its U.S. employees and retirees that include healthcare benefits and life insurance coverage. Certain non-U.S. operations have various retirement benefit programs covering substantially all of their employees. Some of these programs are considered to be defined benefit pension plans for accounting purposes. The components of the pension and post-retirement net periodic benefit (credit) cost for the periods indicated are provided in the table below: Successor Predecessor (1) (In millions) Three months ended June 30, 2019 Three months ended June 30, 2018 Nine months ended June 30, 2019 Period from December 16, 2017 Period from Pension Benefits - U.S. Components of net periodic benefit (credit) cost Service cost $ 1 $ 1 $ 3 $ 2 $ 1 Interest cost 10 9 29 19 22 Expected return on plan assets (15 ) (17 ) (45 ) (35 ) (38 ) Amortization of actuarial loss — — — — 20 Net periodic benefit (credit) cost $ (4 ) $ (7 ) $ (13 ) $ (14 ) $ 5 Pension Benefits - Non-U.S. Components of net periodic benefit cost Service cost $ 2 $ 1 $ 5 $ 3 $ 2 Interest cost 2 3 7 5 3 Expected return on plan assets — — — — (1 ) Amortization of actuarial loss — — — — 2 Net periodic benefit cost $ 4 $ 4 $ 12 $ 8 $ 6 Post-retirement Benefits - U.S. Components of net periodic benefit cost Service cost $ — $ 1 $ 1 $ 1 $ — Interest cost 4 4 11 7 3 Expected return on plan assets (2 ) (3 ) (7 ) (5 ) (2 ) Amortization of prior service cost — — — — (3 ) Amortization of actuarial loss (1 ) — (1 ) — 2 Net periodic benefit cost $ 1 $ 2 $ 4 $ 3 $ — (1 ) Excludes Plan of Reorganization related settlements that were recorded in Reorganization items, net in the Condensed Consolidated Statements of Operations. The service components of net periodic benefit (credit) cost were recorded similar to compensation expense, while all other components were recorded in Other income (expense), net. The Company's general funding policy with respect to its U.S. qualified pension plans is to contribute amounts at least sufficient to satisfy the minimum amount required by applicable law and regulations, or to directly pay benefits where appropriate. Contributions to U.S. pension plans were $22 million for the nine months ended June 30, 2019 , which represented the amounts required to satisfy the minimum statutory funding requirements in the U.S. For the remainder of fiscal 2019 , the Company estimates that it will make contributions totaling $5 million to satisfy the minimum statutory funding requirements in the U.S. Contributions to the non-U.S. pension plans were $19 million for the nine months ended June 30, 2019 . For the remainder of fiscal 2019 , the Company estimates that it will make contributions totaling $6 million for its non-U.S. plans. In June 2019, the Company announced a change in medical benefits under the post-retirement medical plan for represented retirees as of April 30, 2019 and their eligible dependents. Effective January 1, 2020 the post-retirement medical plan coverage provided through the Company’s group plan will be replaced with medical coverage provided through the private and public insurance marketplace for the identified retirees. As a result, the U.S. represented retiree post-retirement plan was remeasured as of June 30, 2019, which resulted in the recognition of an $8 million increase to the accumulated benefit obligation with an offset to Accumulated other comprehensive (loss) income within the Condensed Consolidated Balance Sheets. The increase was mainly driven by changes in actuarial assumptions, partially offset by the impact of the change in medical coverage. Most post-retirement medical benefits are not pre-funded. Consequently, the Company makes payments directly to the claims administrator as retiree medical benefit claims are disbursed. These payments are funded by the Company up to the maximum contribution amounts specified in the plan documents and contract with the Communications Workers of America and the International Brotherhood of Electrical Workers, and contributions from the participants, if required. During the nine months ended June 30, 2019 , the Company made payments for retiree medical and dental benefits of $11 million and received a $3 million reimbursement from the represented employees' post-retirement health trust related to payments in prior periods. The Company estimates it will make contributions for retiree medical and dental benefits totaling $3 million for the remainder of fiscal 2019 .

Share-based Compensation

Share-based Compensation	9 Months Ended
	Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation	Share-based Compensation Successor The Company has a share-based compensation plan under which non-employee directors, employees of the Company or any of its affiliates, and certain consultants and advisors may be granted stock options, restricted stock, restricted stock units ("RSUs"), performance awards ("PRSUs") and other forms of awards granted or denominated in shares of the Company's common stock, as well as certain cash-based awards. Stock options and RSUs granted to employees generally vest ratably over a period of three years . PRSUs granted to certain senior executive employees vest at the end of the service period of three years. Awards granted to non-employee directors during fiscal 2019 vest immediately, while those granted during fiscal 2018 vested ratably over one year . As of the Emergence Date, forfeitures are accounted for as incurred. Pre-tax share-based compensation expense for the three months ended June 30, 2019 and 2018 was $8 million and $7 million , respectively. Pre-tax share-based compensation expense for the nine months ended June 30, 2019 and the period from December 16, 2017 through June 30, 2018 was $19 million and $13 million , respectively. During the nine months ended June 30, 2019 , the Company granted 1,686,004 RSUs with a weighted average grant date fair value of $15.46 per RSU. During the nine months ended June 30, 2019 , there were 1,484,659 RSUs that vested with a weighted average grant date fair value of $15.49 . In February 2019, the Company granted 274,223 PRSUs with a grant date fair value of $11.18 per PRSU. These PRSUs will become eligible to vest if, prior to the vesting date of February 11, 2022, the average closing price of one share of the Company’s Common Stock for sixty consecutive days equals or exceeds $23.50 . The grant date fair value of the award was estimated using a Monte Carlo simulation model that incorporated multiple valuation assumptions, including the probability of achieving the specified market condition. Additional assumptions used in the valuation included an expected volatility of 53.76% based on a blend of Company and peer group company historical data adjusted for the Company’s leverage, and a risk-free interest rate of 2.45% based on U.S. Treasury yields with a term equal to the vesting period. The grant date fair value of these PRSUs will be recognized as expense ratably over the vesting period and will not be adjusted in future periods for the success or failure to achieve the specified market condition. In February 2019, the Company also granted 182,020 PRSUs which will vest based on the attainment of specified performance metrics for each of the next three separate fiscal years (collectively the "Performance Period"), and the Company's total shareholder return over the Performance Period as compared to the total shareholder return for a specified index of companies over the same period. The grant date fair value of the awards was estimated using a Monte Carlo simulation model that incorporated multiple valuation assumptions, including the probability of achieving the total shareholder return market condition. Other key assumptions used in the valuation included an expected volatility of 53.00% based on a blend of Company and peer group company historical data adjusted for the Company’s leverage, and a risk free interest rate of 2.46% based on U.S. Treasury yields with a term equal to the remaining Performance Period as of the grant date. During the Performance Period, the Company will adjust compensation expense for the awards based on its best estimate of attainment of the specified annual performance metrics. The cumulative effect on current and prior periods of a change in the estimated number of PRSUs that are expected to be earned during the Performance Period will be recognized as an adjustment to earnings in the period of the revision. Predecessor Prior to the Emergence Date, the Predecessor Company had granted share-based awards that were canceled upon emergence from bankruptcy. In conjunction with the cancellation, the Predecessor Company accelerated the unrecognized share-based compensation expense and recorded $3 million of compensation expense in the period from October 1, 2017 through December 15, 2017 , principally reflected in Reorganization costs, net.

Capital Stock

Capital Stock	9 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Capital Stock	Capital Stock Preferred Stock The Company's certificate of incorporation authorizes it to issue up to 55,000,000 shares of preferred stock with a par value of $0.01 per share. As of June 30, 2019 and September 30, 2018 , there were no preferred shares issued or outstanding. Common Stock The Company's certificate of incorporation authorizes it to issue up to 550,000,000 shares of common stock with a par value of $0.01 per share. As of June 30, 2019 , there were 110,887,967 shares issued and 110,875,287 shares outstanding with the remaining 12,680 shares distributable in accordance with the Plan of Reorganization. As of September 30, 2018 , there were 110,218,653 shares issued and 110,012,790 shares outstanding with the remaining 205,863 shares distributable in accordance with the Plan of Reorganization. On November 14, 2018, the Company's Board of Directors approved a warrant repurchase program, authorizing the Company to repurchase Emergence Date Warrants for an aggregate expenditure of up to $15 million . The repurchases may be made from time to time in the open market, through block trades or in privately negotiated transactions. The Company may adopt one or more purchase plans pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, in order to implement the warrant repurchase program. The warrant repurchase program does not obligate the Company to purchase any warrants and may be terminated, increased or decreased by the Board of Directors in its discretion at any time. As of June 30, 2019 , there were no warrant repurchases under the program.

Net Income (Loss) Per Common Sh

Net Income (Loss) Per Common Share	9 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Net Income (Loss) Per Common Share	Per Common Share Basic (loss) earnings per share is calculated by dividing net (loss) income attributable to common stockholders by the weighted average number of common shares outstanding. Diluted earnings per share reflects the potential dilution that would occur if equity awards granted under the Company's various share-based compensation plans were vested or exercised; if the Company's Convertible Notes or the warrants the Company sold to purchase up to 12.6 million shares of its common stock in connection with the issuance of the Convertible Notes ("Call Spread Warrants") were exercised; and/or if the Emergence Date Warrants were exercised, resulting in the issuance of common shares that would participate in the earnings of the Company. The following table sets forth the calculation of net (loss) income attributable to common shareholders and the computation of basic and diluted (loss) earnings per share for the periods indicated: Successor Predecessor (In millions, except per share amounts) Three months ended June 30, 2019 Three months ended June 30, 2018 Nine months ended June 30, 2019 Period from December 16, 2017 Period from (Loss) earnings per share: Numerator Net (loss) income $ (633 ) $ (88 ) $ (637 ) $ 19 $ 2,977 Dividends and accretion to preferred stockholders — — — — (6 ) Undistributed (loss) income (633 ) (88 ) (637 ) 19 2,971 Percentage allocated to common stockholders (1) 100.0 % 100.0 % 100.0 % 100.0 % 86.9 % Numerator for basic and diluted (loss) earnings per common share $ (633 ) $ (88 ) $ (637 ) $ 19 $ 2,582 Denominator Denominator for basic (loss) earnings per weighted average common shares 111.0 109.8 110.7 109.8 497.3 Effect of dilutive securities Restricted stock units — — — 1.2 — Denominator for diluted (loss) earnings per weighted average common shares 111.0 109.8 110.7 111.0 497.3 (Loss) earnings per common share Basic $ (5.70 ) $ (0.80 ) $ (5.75 ) $ 0.17 $ 5.19 Diluted $ (5.70 ) $ (0.80 ) $ (5.75 ) $ 0.17 $ 5.19 (1) Basic weighted average common stock outstanding 111.0 109.8 110.7 109.8 497.3 Basic weighted average common stock and common stock equivalents (preferred shares) 111.0 109.8 110.7 109.8 572.4 Percentage allocated to common stockholders 100.0 % 100.0 % 100.0 % 100.0 % 86.9 % For the three and nine months ended June 30, 2019 , the Company excluded 1.0 million stock options, 3.6 million RSUs and 5.6 million Emergence Date Warrants from the diluted loss per share calculation as their effect would have been anti-dilutive. The Company also excluded 0.5 million PRSUs from the diluted loss per share calculation as their performance metrics have not yet been attained. The Company’s Convertible Notes and Call Spread Warrants were also excluded for the three and nine months ended June 30, 2019 as discussed in more detail below. For the three months ended June 30, 2018 , the Company excluded 1.1 million stock options, 3.3 million restricted stock units and 5.6 million Emergence Date Warrants from the diluted loss per share calculation as their effect would have been anti-dilutive. For the period from December 16, 2017 through June 30, 2018 , the Company excluded 1.1 million stock options and 5.6 million Emergence Date Warrants from the diluted earnings per share calculation as their effect would have been anti-dilutive. For purposes of considering the Convertible Notes in determining diluted (loss) earnings per share, the Company has the ability and current intent to settle conversions of the Convertible Notes through combination settlement by repaying the principal portion in cash and any excess of the conversion value over the principal amount (the "Conversion Premium") in shares of the Company's common stock. Therefore, only the impact of the Conversion Premium will be included in diluted weighted average shares outstanding using the treasury stock method. Since the Convertible Notes were out of the money and anti-dilutive as of June 30, 2019 and 2018, they were excluded from the diluted loss per share calculation for the three months ended June 30, 2019 and 2018 , the nine months ended June 30, 2019 and the period from December 16, 2017 through June 30, 2018 . The Call Spread Warrants will not be considered in calculating diluted weighted average shares outstanding until the price per share of the Company’s common stock exceeds the strike price of $37.3625 per share. When the price per share of the Company’s common stock exceeds the strike price per share of the Call Spread Warrants, the effect of the additional shares that may be issued upon exercise of the Call Spread Warrants will be included in diluted weighted average shares outstanding using the treasury stock method.

Operating Segments

Operating Segments	9 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Operating Segments	Segments The Products & Solutions segment primarily develops, markets, and sells unified communications and contact center solutions, offered on premises, in the cloud, or as a hybrid solution. These integrate multiple forms of communications, including telephony, email, instant messaging and video. The Services segment develops, markets and sells comprehensive end-to-end global service offerings that enable customers to evaluate, plan, design, implement, monitor, manage and optimize complex enterprise communications networks. The Company’s chief operating decision maker makes financial decisions and allocates resources based on segment profit information obtained from the Company’s internal management systems. Management does not include in its segment measures of profitability selling, general and administrative expenses, research and development expenses, amortization of intangible assets, and certain discrete items, such as fair value adjustments recognized upon emergence from bankruptcy, charges relating to restructuring actions, impairment charges, and merger-related costs as these costs are not core to the measurement of segment performance, but rather are controlled at the corporate level. Summarized financial information relating to the Company's operating segments is shown in the following table for the periods indicated: Successor Predecessor (In millions) Three months ended Three months ended Nine months ended Period from December 16, 2017 Period from REVENUE Products & Solutions $ 298 $ 322 $ 913 $ 716 $ 253 Services 422 433 1,269 967 351 Unallocated Amounts (1) (3 ) (63 ) (18 ) (171 ) — $ 717 $ 692 $ 2,164 $ 1,512 $ 604 GROSS PROFIT Products & Solutions $ 189 $ 210 $ 587 $ 473 $ 169 Services 249 257 759 582 196 Unallocated Amounts (2) (48 ) (115 ) (163 ) (302 ) (3 ) 390 352 1,183 753 362 OPERATING EXPENSES Selling, general and administrative 253 281 761 613 264 Research and development 49 51 154 110 38 Amortization of intangible assets 41 39 122 86 10 Impairment charges 659 — 659 — — Restructuring charges, net 1 30 12 80 14 1,003 401 1,708 889 326 OPERATING (LOSS) INCOME (613 ) (49 ) (525 ) (136 ) 36 INTEREST EXPENSE, OTHER INCOME (EXPENSE), NET AND REORGANIZATION ITEMS, NET (47 ) (19 ) (142 ) (80 ) 3,400 (LOSS) INCOME BEFORE INCOME TAXES $ (660 ) $ (68 ) $ (667 ) $ (216 ) $ 3,436 (1) Unallocated amounts in Revenue represent the fair value adjustment to deferred revenue recognized upon emergence from bankruptcy and excluded from segment revenue. (2) Unallocated amounts in Gross Profit include the fair value adjustments recognized upon emergence from bankruptcy and excluded from segment gross profit; the effect of the amortization of technology intangibles; and costs that are not core to the measurement of segment management’s performance, but rather are controlled at the corporate level.

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	9 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income The components of Accumulated other comprehensive (loss) income for the periods indicated were as follows: (In millions) Change in Unamortized Pension, Post-retirement and Postemployment Benefit-related Items Foreign Currency Translation Unrealized Loss on Term Loan Interest Rate Swap Other Accumulated Other Comprehensive Income (Loss) Balance as of March 31, 2019 (Successor) $ 51 $ (12 ) $ (33 ) $ — $ 6 Other comprehensive loss before reclassifications (8 ) (10 ) (31 ) — (49 ) Amounts reclassified to earnings — — 2 — 2 Benefit from income taxes 2 — 7 — 9 Balance as of June 30, 2019 (Successor) $ 45 $ (22 ) $ (55 ) $ — $ (32 ) (In millions) Change in Unamortized Pension, Post-retirement and Postemployment Benefit-related Items Foreign Currency Translation Unrealized Loss on Term Loan Interest Rate Swap Other Accumulated Other Comprehensive Income (Loss) Balance as of September 30, 2018 (Successor) $ 51 $ (31 ) $ (2 ) $ — $ 18 Other comprehensive (loss) income before reclassifications (8 ) 9 (78 ) — (77 ) Amounts reclassified to earnings — — 7 — 7 Benefit from income taxes 2 — 18 — 20 Balance as of June 30, 2019 (Successor) $ 45 $ (22 ) $ (55 ) $ — $ (32 ) (In millions) Change in Unamortized Pension, Post-retirement and Postemployment Benefit-related Items Foreign Currency Translation Unrealized Loss on Term Loan Interest Rate Swap Other Accumulated Other Comprehensive Loss Balance as of March 31, 2018 (Successor) $ — $ (25 ) $ — $ — $ (25 ) Other comprehensive loss before reclassifications — (4 ) (17 ) — (21 ) Amounts reclassified to earnings — — 2 — 2 Benefit from income taxes — — 3 — 3 Balance as of June 30, 2018 (Successor) $ — $ (29 ) $ (12 ) $ — $ (41 ) (In millions) Change in Unamortized Pension, Post-retirement and Postemployment Benefit-related Items Foreign Currency Translation Unrealized Loss on Term Loan Interest Rate Swap Other Accumulated Other Comprehensive (Loss) Income Balance as of September 30, 2017 (Predecessor) $ (1,375 ) $ (72 ) $ — $ (1 ) $ (1,448 ) Other comprehensive (loss) income before reclassifications (24 ) 3 — — (21 ) Amounts reclassified to earnings 16 — — — 16 Pension settlement 721 — — — 721 Provision for income taxes (58 ) — — — (58 ) Balance as of December 15, 2017 (Predecessor) (720 ) (69 ) — (1 ) (790 ) Elimination of Predecessor Company Accumulated other comprehensive loss 720 69 — 1 790 Balance as of December 15, 2017 (Predecessor) $ — $ — $ — $ — $ — Balance as of December 16, 2017 (Successor) $ — $ — $ — $ — $ — Other comprehensive loss before reclassifications — (29 ) (17 ) — (46 ) Amounts reclassified to earnings — — 2 — 2 Benefit from income taxes — — 3 — 3 Balance as of June 30, 2018 (Successor) $ — $ (29 ) $ (12 ) $ — $ (41 ) The amounts reclassified out of Accumulated other comprehensive (loss) income for the unamortized pension, post-retirement and postemployment benefit-related items are recorded in Other income (expense), net in the Condensed Consolidated Statement of Operations. The amounts reclassified out of Accumulated other comprehensive (loss) income for the interest rate swaps are recorded in Interest expense in the Condensed Consolidated Statement of Operations.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Jun. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company's Board of Directors is comprised of seven directors, including the Company's Chief Executive Officer and six non-employee directors. On March 18, 2019, Jacqueline E. Yeaney joined the Company's Board of Directors, filling the previous vacancy on the Company's Board of Directors caused by the resignation of Ronald A. Rittenmeyer effective as of April 30, 2018. Specific Arrangements Involving the Successor Company’s Current Directors and Executive Officers William D. Watkins is a Director and Chair of the Board of Directors of Avaya Holdings and serves on the board of directors of Flex Ltd., an electronics design manufacturer. For the nine months ended June 30, 2019 (Successor), the period from December 16, 2017 through June 30, 2018 (Successor), and the period from October 1, 2017 through December 15, 2017 (Predecessor), the Company purchased goods and services from subsidiaries of Flex Ltd. of $22 million , $13 million , and $6 million , respectively. As of June 30, 2019 (Successor) and September 30, 2018 (Successor), the Company had outstanding accounts payable due to Flex Ltd. of $18 million and $4 million , respectively.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings General The Company records accruals for legal contingencies to the extent that it has concluded that it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. No estimate of the possible loss or range of loss in excess of amounts accrued, if any, can be made at this time regarding the matters specifically described below because the inherently unpredictable nature of legal proceedings may be exacerbated by various factors, including: (i) the damages sought in the proceedings are unsubstantiated or indeterminate; (ii) discovery is not complete; (iii) the proceeding is in its early stages; (iv) the matters present legal uncertainties; (v) there are significant facts in dispute; (vi) there are a large number of parties (including where it is uncertain how liability, if any, will be shared among multiple defendants); or (vii) there is a wide range of potential outcomes. In the ordinary course of business, the Company is involved in litigation, claims, government inquiries, investigations and proceedings, including, but not limited to, those identified below, relating to intellectual property, commercial, employment, environmental and regulatory matters. Based on the Company's experience, management believes that the damages amounts claimed in a case are not a meaningful indicator of the potential liability. Claims, suits, investigations and proceedings are inherently uncertain and it is not possible to predict the ultimate outcome of cases. The Company believes that it has meritorious defenses in connection with its current lawsuits and material claims and disputes. In the opinion of the Company's management based upon information currently available to the Company, while the outcome of these lawsuits, claims and disputes is uncertain, the likely results of these lawsuits, claims and disputes are not expected, either individually or in the aggregate, to have a material adverse effect on the Company's financial position, results of operations or cash flows, although the effect could be material to the Company's consolidated results of operations or consolidated cash flows for any interim reporting period. During the three months ended June 30, 2019 and 2018 (Successor), the nine months ended June 30, 2019 (Successor), and the period from December 16, 2017 through June 30, 2018 (Successor), there were no costs incurred in connection with the resolution of legal matters other than those incurred in the ordinary course of business. During the period from October 1, 2017 through December 15, 2017 (Predecessor), costs incurred in connection with the resolution of certain legal matters was $37 million . Intellectual Property and Commercial Disputes In January 2010, SAE Power Incorporated and SAE Power Company (collectively, "SAE") filed a complaint in the New Jersey Superior Court asserting various claims including breach of contract, unjust enrichment, promissory estoppel and breach of the covenant of good faith and fair dealing arising out of Avaya’s relationship with SAE as a supplier of various power supply products. SAE has since asserted additional claims against Avaya for fraud, negligent misrepresentation, misappropriation of trade secrets and civil conspiracy. SAE sought to recover for alleged losses stemming from Avaya’s termination of its power supply purchases from SAE, including for Avaya’s alleged disclosure of SAE’s alleged trade secret and/or confidential information to another power supply vendor. On July 19, 2016, the Court entered an order granting Avaya’s motion for partial summary judgment, dismissing certain of SAE’s claims regarding the alleged disclosure of trade secrets. In January 2017, the Company filed a Notice of Suggestion of Pendency of Bankruptcy, which informed the Court of the Company’s voluntary bankruptcy petition filing and stay of proceedings. SAE filed a proof of claim in the Bankruptcy Court. On September 28, 2017, the Company filed a motion in the Bankruptcy Court seeking to estimate SAE’s claim, and the estimation hearing took place on February 15, 2018. On June 12, 2018, the Bankruptcy Court entered an Order estimating SAE’s pre-petition misappropriation claim in the amount of $1.21 million plus interest, its fraud claim at $0 million and declined to estimate SAE’s breach of contract claim, leaving it to be resolved through the bankruptcy claims allowance process. Once the stay of proceedings is lifted, SAE may pursue its liability claims against Avaya in the New Jersey state court action, subject to the estimation Order of the Bankruptcy Court. On June 22, 2018, SAE filed a Notice of Appeal challenging the estimation Order, which was denied by the United States District Court on May 6, 2019. In July 2019, the Company and SAE reached a settlement of the dispute. SAE will receive an allowed unsecured claim and distribution in accordance with the general unsecured claims procedure in the Company's Plan of Reorganization, and Avaya will be dismissed from the state court action. In the ordinary course of business, the Company is involved in litigation alleging it has infringed upon third parties’ intellectual property rights, including patents and copyrights; some litigation may involve claims for infringement against customers, distributors and resellers by third parties relating to the use of Avaya’s products, as to which the Company may provide indemnifications of varying scope to certain parties. The Company is also involved in litigation pertaining to general commercial disputes with customers, suppliers, vendors and other third parties including royalty disputes. These matters are ongoing and the outcomes are subject to inherent uncertainties. As a result, the Company cannot be assured that any such matter will not have a material adverse effect on its financial position, results of operations or cash flows. Product Warranties The Company recognizes a liability for the estimated costs that may be incurred to remedy certain deficiencies of quality or performance of the Company’s products. These product warranties extend over a specified period of time, generally ranging up to two years from the date of sale depending upon the product subject to the warranty. The Company accrues a provision for estimated future warranty costs based upon the historical relationship of warranty claims to sales. The Company periodically reviews the adequacy of its product warranties and adjusts, if necessary, the warranty percentage and accrued warranty reserve, which is included in other current and non-current liabilities in the Condensed Consolidated Balance Sheets, for actual experience. As of June 30, 2019 and September 30, 2018 , the amount reserved was $1 million and $2 million , respectively. Guarantees of Indebtedness and Other Off-Balance Sheet Arrangements Letters of Credit and Guarantees The Company provides guarantees, letters of credit and surety bonds to various parties as required for certain transactions initiated during the ordinary course of business to guarantee the Company's performance in accordance with contractual or legal obligations. As of June 30, 2019 , the maximum potential payment obligation with regards to letters of credit, guarantees and surety bonds was $70 million . The outstanding letters of credit are collateralized by restricted cash of $4 million included in Other assets on the Condensed Consolidated Balance Sheets as of June 30, 2019 . Purchase Commitments and Termination Fees The Company purchases components from a variety of suppliers and uses several contract manufacturers to provide manufacturing services for its products. During the normal course of business, to manage manufacturing lead times and to help assure adequate component supply, the Company enters into agreements with contract manufacturers and suppliers that allow them to produce and procure inventory based upon forecasted requirements provided by the Company. If the Company does not meet these specified purchase commitments, it could be required to purchase the inventory, or in the case of certain agreements, pay an early termination fee. Historically, the Company has not been required to pay a charge for not meeting its designated purchase commitments with these suppliers, but has been obligated to purchase certain excess inventory levels from its outsourced manufacturers due to actual sales of product varying from forecast and due to transition of manufacturing from one vendor to another. The Company’s outsourcing agreements with its most significant contract manufacturers automatically renew in July and September for successive periods of twelve months each, subject to specific termination rights for the Company and the contract manufacturers. All manufacturing of the Company’s products is performed in accordance with either detailed requirements or specifications and product designs furnished by the Company, and is subject to rigorous quality control standards. Transactions with Nokia Pursuant to the Contribution and Distribution Agreement effective October 1, 2000 (the "Contribution and Distribution Agreement"), Lucent Technologies, Inc. (now Nokia) contributed to the Company substantially all of the assets, liabilities and operations associated with its enterprise networking businesses (the "Company’s Businesses") and distributed the Company’s stock pro-rata to the shareholders of Lucent ("distribution"). The Contribution and Distribution Agreement, among other things, provides that, in general, the Company will indemnify Nokia for all liabilities including certain pre-distribution tax obligations of Nokia relating to the Company’s Businesses and all contingent liabilities primarily relating to the Company’s Businesses or otherwise assigned to the Company. In addition, the Contribution and Distribution Agreement provides that certain contingent liabilities not allocated to one of the parties will be shared by Nokia and the Company in prescribed percentages. The Contribution and Distribution Agreement also provides that each party will share specified portions of contingent liabilities based upon agreed percentages related to the business of the other party that exceed $50 million . The Company is unable to determine the maximum potential amount of other future payments, if any, that it could be required to make under this agreement. In addition, in connection with the distribution, the Company and Lucent entered into a Tax Sharing Agreement effective October 1, 2000 (the "Tax Sharing Agreement") that governs Nokia’s and the Company’s respective rights, responsibilities and obligations after the distribution with respect to taxes for the periods ending on or before the distribution. Generally, pre-distribution taxes or benefits that are clearly attributable to the business of one party will be borne solely by that party and other pre-distribution taxes or benefits will be shared by the parties based on a formula set forth in the Tax Sharing Agreement. The Company may be subject to additional taxes or benefits pursuant to the Tax Sharing Agreement related to future settlements of audits by state and local and foreign taxing authorities for the periods prior to the Company’s separation from Nokia.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Impact of Adoption	The impact of the adoption of ASC 606 by financial statement line item within the Condensed Consolidated Balance Sheet as of June 30, 2019 is as follows: June 30, 2019 (In millions) As Reported Adjustments Without Adoption of ASC 606 ASSETS Inventory $ 71 $ 33 $ 104 Contract assets 178 (178 ) — Contract costs 128 (128 ) — Other current assets 149 100 249 Property, plant and equipment, net 243 1 244 Deferred income taxes, net 25 2 27 Other assets 109 (10 ) 99 LIABILITIES Accounts payable 292 (1 ) 291 Contract liabilities 470 48 518 Other current liabilities 130 4 134 Deferred income taxes, net 120 (29 ) 91 Other liabilities 390 2 392 STOCKHOLDERS' EQUITY Retained earnings (255 ) (204 ) (459 ) The impact of the adoption of ASC 606 by financial statement line item within the Condensed Consolidated Balance Sheet as of June 30, 2019 is as follows: June 30, 2019 (In millions) As Reported Adjustments Without Adoption of ASC 606 ASSETS Inventory $ 71 $ 33 $ 104 Contract assets 178 (178 ) — Contract costs 128 (128 ) — Other current assets 149 100 249 Property, plant and equipment, net 243 1 244 Deferred income taxes, net 25 2 27 Other assets 109 (10 ) 99 LIABILITIES Accounts payable 292 (1 ) 291 Contract liabilities 470 48 518 Other current liabilities 130 4 134 Deferred income taxes, net 120 (29 ) 91 Other liabilities 390 2 392 STOCKHOLDERS' EQUITY Retained earnings (255 ) (204 ) (459 ) The impact of the adoption of ASC 606 by financial statement line item within the Condensed Consolidated Statements of Operations for the three and nine months ended June 30, 2019 is as follows: Three months ended June 30, 2019 Nine months ended June 30, 2019 (In millions) As Reported Adjustments Without Adoption of ASC 606 As Reported Adjustments Without Adoption of ASC 606 REVENUE Products $ 297 $ (26 ) $ 271 $ 908 $ (71 ) $ 837 Services 420 (19 ) 401 1,256 (60 ) 1,196 717 (45 ) 672 2,164 (131 ) 2,033 COSTS Products: Costs 109 (4 ) 105 329 (13 ) 316 Amortization of technology intangible assets 43 — 43 130 — 130 Services 175 (7 ) 168 522 (20 ) 502 327 (11 ) 316 981 (33 ) 948 GROSS PROFIT 390 (34 ) 356 1,183 (98 ) 1,085 OPERATING EXPENSES Selling, general and administrative 253 (1 ) 252 761 3 764 Research and development 49 — 49 154 — 154 Amortization of intangible assets 41 — 41 122 — 122 Impairment charges 659 — 659 659 — 659 Restructuring charges, net 1 — 1 12 — 12 1,003 (1 ) 1,002 1,708 3 1,711 OPERATING LOSS (613 ) (33 ) (646 ) (525 ) (101 ) (626 ) Interest expense (59 ) — (59 ) (177 ) — (177 ) Other income, net 12 — 12 35 — 35 LOSS BEFORE INCOME TAXES (660 ) (33 ) (693 ) (667 ) (101 ) (768 ) Benefit from (provision for) income taxes 27 (37 ) (10 ) 30 (8 ) 22 NET LOSS $ (633 ) $ (70 ) $ (703 ) $ (637 ) $ (109 ) $ (746 )
Disaggregation of Revenue	Disaggregation of Revenue The following tables provide the Company's disaggregated revenue for the three and nine months ended June 30, 2019 : (In millions) Three months ended June 30, 2019 Nine months ended June 30, 2019 REVENUE Products & Solutions $ 298 $ 913 Services 422 1,269 Unallocated Amounts (3 ) (18 ) $ 717 $ 2,164 Three months ended June 30, 2019 (In millions) Products & Solutions Services Unallocated Total Revenue: U.S. $ 149 $ 245 $ (2 ) $ 392 International: Europe, Middle East and Africa 91 93 (1 ) 183 Asia Pacific 38 47 — 85 Americas International - Canada and Latin America 20 37 — 57 Total International 149 177 (1 ) 325 Total revenue $ 298 $ 422 $ (3 ) $ 717 Nine months ended June 30, 2019 (In millions) Products & Solutions Services Unallocated Total Revenue: U.S. $ 429 $ 744 $ (12 ) $ 1,161 International: Europe, Middle East and Africa 290 283 (3 ) 570 Asia Pacific 113 131 (2 ) 242 Americas International - Canada and Latin America 81 111 (1 ) 191 Total International 484 525 (6 ) 1,003 Total revenue $ 913 $ 1,269 $ (18 ) $ 2,164
Contract with Customer, Asset and Liability	The following table provides information about accounts receivable, contract assets and contract liabilities for the periods presented: (In millions) June 30, 2019 October 1, 2018 Increase (Decrease) Accounts receivable, net $ 276 $ 376 $ (100 ) Contract assets: Current $ 178 $ 78 $ 100 Non-current (Other assets) 3 3 — $ 181 $ 81 $ 100 Cost of obtaining a contract: Current (Contract costs) $ 88 $ 64 $ 24 Non-current (Other assets) 44 36 8 $ 132 $ 100 $ 32 Cost to fulfill a contract: Current (Contract costs) $ 40 $ 45 $ (5 ) Contract liabilities: Current $ 470 $ 467 $ 3 Non-current (Other liabilities) 76 52 24 $ 546 $ 519 $ 27

Goodwill (Tables)

Goodwill (Tables)	9 Months Ended
	Jun. 30, 2019
Goodwill [Line Items]
Schedule of Goodwill	The changes in the carrying amount of goodwill by segment during fiscal 2019 were as follows: (In millions) Products & Solutions Services Total Balance as of September 30, 2018 $ 1,283 $ 1,481 $ 2,764 Impairment charges (657 ) — (657 ) Other — (2 ) (2 ) Balance as of June 30, 2019 $ 626 $ 1,479 $ 2,105

Supplementary Financial Infor_2

Supplementary Financial Information (Tables)	9 Months Ended
	Jun. 30, 2019
Supplementary Financial Information [Abstract]
Consolidated Statements of Operations Information	The following table presents a summary of Other income (expense), net for the periods indicated: Successor Predecessor (In millions) Three months ended Three months ended Nine months ended Period from December 16, 2017 Period from OTHER INCOME (EXPENSE), NET Interest income $ 4 $ 1 $ 11 $ 2 $ 2 Foreign currency (losses) gains, net (1 ) 25 (8 ) 24 — Income from transition services agreement, net — 1 — 5 3 Other pension and post-retirement benefit credits (costs), net 1 4 5 9 (8 ) Change in fair value of emergence date warrants 7 6 28 (9 ) — Other, net 1 — (1 ) 1 1 Total other income (expense), net $ 12 $ 37 $ 35 $ 32 $ (2 )
Summary of Reorganization Items	A summary of Reorganization items, net for the periods indicated is presented in the following table: Predecessor (In millions) Period from REORGANIZATION ITEMS, NET Net gain on settlement of Liabilities subject to compromise $ 1,778 Net gain on fresh start adjustments 1,697 Bankruptcy-related professional fees (56 ) Other items, net (3 ) Reorganization items, net $ 3,416 Cash payments for reorganization items $ 2,524
Supplemental Cash Flow Information	Successor Predecessor (In millions) June 30, September 30, 2018 June 30, 2018 December 15, 2017 September 30, 2017 CASH, CASH EQUIVALENTS, AND RESTRICTED CASH Cash and cash equivalents $ 729 $ 700 $ 685 $ 366 $ 876 Restricted cash included in other current assets — — 10 65 85 Restricted cash included in other assets 5 4 4 4 5 Total cash, cash equivalents, and restricted cash $ 734 $ 704 $ 699 $ 435 $ 966 As of June 30, 2018 (Successor), restricted cash in other current assets consisted primarily of funds held related to the sale of the Company's Networking business in July 2017. As of December 15, 2017 (Predecessor), restricted cash in other current assets consisted primarily of funds held for bankruptcy-related professional fees. As of September 30, 2017 (Predecessor), restricted cash in other current assets consisted primarily of cash that was drawn from term loans under the Debtor-in-Possession credit agreement to cash collateralize existing letters of credit. Successor Predecessor (In millions) Three months ended Three months ended Nine months ended Period from December 16, 2017 Period from OTHER PAYMENTS Interest payments $ 61 $ 52 $ 160 $ 99 $ 15 Income tax payments 13 8 48 17 7 NON-CASH INVESTING ACTIVITIES (Decrease) increase in Accounts payable for Capital expenditures $ (6 ) $ 5 $ (1 ) $ 5 $ — The following table presents a reconciliation of cash, cash equivalents, and restricted cash that sum to the total of the same such amounts shown in the Condensed Consolidated Statements of Cash Flows for the periods presented: Successor Predecessor (In millions) June 30, September 30, 2018 June 30, 2018 December 15, 2017 September 30, 2017 CASH, CASH EQUIVALENTS, AND RESTRICTED CASH Cash and cash equivalents $ 729 $ 700 $ 685 $ 366 $ 876 Restricted cash included in other current assets — — 10 65 85 Restricted cash included in other assets 5 4 4 4 5 Total cash, cash equivalents, and restricted cash $ 734 $ 704 $ 699 $ 435 $ 966

Business Restructuring Reserv_2

Business Restructuring Reserves and Programs (Tables)	9 Months Ended
	Jun. 30, 2019
Restructuring Reserve [Abstract]
Schedule of Restructuring and Related Costs	The following table summarizes the components of the fiscal 2019 restructuring program for the nine months ended June 30, 2019 : (In millions) Employee Separation Costs Lease Obligations Total Restructuring charges $ 10 $ 2 $ 12 Cash payments (5 ) — (5 ) Impact of foreign currency fluctuations (1 ) — (1 ) Accrual balance as of June 30, 2019 $ 4 $ 2 $ 6 The following table aggregates the remaining components of the fiscal 2008 through 2017 restructuring programs for the nine months ended June 30, 2019 : (In millions) Employee Separation Costs Lease Obligations Total Accrual balance as of September 30, 2018 $ 38 $ 6 $ 44 Adjustments (1) 1 — 1 Cash payments (12 ) (2 ) (14 ) Impact of foreign currency fluctuations (1 ) — (1 ) Accrual balance as of June 30, 2019 $ 26 $ 4 $ 30 The following table summarizes the components of the fiscal 2018 restructuring program for the nine months ended June 30, 2019 : (In millions) Employee Separation Costs Lease Obligations Total Accrual balance as of September 30, 2018 $ 54 $ — $ 54 Adjustments (1) (1 ) — (1 ) Cash payments (15 ) — (15 ) Impact of foreign currency fluctuations (1 ) — (1 ) Accrual balance as of June 30, 2019 $ 37 $ — $ 37

Financing Arrangements (Tables)

Financing Arrangements (Tables)	9 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The following table reflects principal amounts of debt and debt net of discounts and issuance costs for the periods presented: June 30, 2019 September 30, 2018 (In millions) Principal amount Net of discounts and issuance costs Principal amount Net of discounts and issuance costs Term Loan Credit Agreement due December 15, 2024 $ 2,881 $ 2,852 $ 2,903 $ 2,870 Convertible 2.25% senior notes due June 15, 2023 350 268 350 256 Total debt $ 3,231 3,120 $ 3,253 3,126 Debt maturing within one year (29 ) (29 ) Long-term debt, net of current portion $ 3,091 $ 3,097
Convertible Debt	The net carrying amount of the Convertible Notes for the periods indicated was as follows: (In millions) June 30, 2019 September 30, 2018 Principal $ 350 $ 350 Less: Unamortized debt discount (76 ) (87 ) Unamortized issuance costs (6 ) (7 ) Net carrying amount $ 268 $ 256

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Assumptions Used	The fair value of the Emergence Date Warrants as of June 30, 2019 and September 30, 2018 was determined using the input assumptions summarized below: June 30, 2019 September 30, 2018 Expected volatility 57.56 % 50.14 % Risk-free interest rates 1.71 % 2.90 % Contractual remaining life (in years) 3.46 4.21 Price per share of common stock $11.91 $22.14
Schedule of Derivative Instruments in Balance Sheet	The following table summarizes the fair value of the Company's derivatives on a gross basis segregated between those that are designated as hedging instruments and those that are not designated as hedging instruments: June 30, 2019 September 30, 2018 (In millions) Balance Sheet Caption Asset Liability Asset Liability Derivatives Designated as Hedging Instruments: Interest rate contracts Other assets $ — $ — $ 3 $ — Interest rate contracts Other current liabilities — 19 — 7 Interest rate contracts Other liabilities — 56 — — — 75 3 7 Derivatives Not Designated as Hedging Instruments: Foreign exchange contracts Other current assets 2 — — — Emergence Date Warrants Other liabilities — 6 — 34 2 6 — 34 Total derivative fair value $ 2 $ 81 $ 3 $ 41
Derivatives Designated as Cash Flow Hedges	The following tables provide information regarding the location and amount of pre-tax losses for derivatives designated as cash flow hedges: Three months ended Three months ended (In millions) Interest Expense Other Comprehensive (Loss) Income Interest Expense Other Comprehensive (Loss) Income Financial Statement Line Item in which Cash Flow Hedges are Recorded $ (59 ) $ (38 ) $ (56 ) $ (16 ) Impact of cash flow hedging relationships: Loss recognized in AOCI - on interest rate swaps — (31 ) — (17 ) Interest expense from AOCI reclassified (2 ) 2 (2 ) 2 Successor Predecessor Nine months ended June 30, 2019 Period from December 16, 2017 Period from (In millions) Interest Expense Other Comprehensive (Loss) Income Interest Expense Other Comprehensive (Loss) Income Interest Expense Other Comprehensive (Loss) Income Financial Statement Line Item in which Cash Flow Hedges are Recorded $ (177 ) $ (50 ) $ (112 ) $ (41 ) $ (14 ) $ 658 Impact of cash flow hedging relationships: Loss recognized in AOCI - on interest rate swaps — (78 ) — (17 ) $ — $ — Interest expense from AOCI reclassified (7 ) 7 (2 ) 2 $ — $ —
Derivatives Not Designated As Hedging Instruments	The following table provides information regarding the pre-tax gains (losses) for derivatives not designated as hedging instruments on the Condensed Consolidated Statements of Operations: Successor Predecessor Three months ended Three months ended Nine months ended June 30, 2019 Period from December 16, 2017 Period from (In millions) Location of Derivative Pre-tax Gain (Loss) Emergence Date Warrants Other income (expense), net $ 7 $ 6 $ 28 $ (9 ) $ — Foreign exchange contracts Other income (expense), net (1 ) — (1 ) — —
Schedule of Outstanding Derivative Positions Presented on a Net Basis	The following table provides information on the Company's derivative positions as if those subject to master netting arrangements were presented on a net basis, allowing for the right to offset by counterparty per the master netting agreements: June 30, 2019 September 30, 2018 (In millions) Asset Liability Asset Liability Gross amounts recognized in the Condensed Consolidated Balance Sheet $ 2 $ 81 $ 3 $ 41 Gross amount subject to offset in master netting arrangements not offset in the Condensed Consolidated Balance Sheet (2 ) (2 ) (3 ) (3 ) Net amounts $ — $ 79 $ — $ 38

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Jun. 30, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class	The Company's intangible assets consist of the following for the periods indicated: (In millions) Customer Trademarks Total Balance as of June 30, 2019 Finite-lived intangible assets: Cost $ 961 $ 2,156 $ 42 $ 3,159 Accumulated amortization (265 ) (240 ) (9 ) (514 ) Finite-lived intangible assets, net 696 1,916 33 2,645 Indefinite-lived intangible assets: Cost 2 — 333 335 Accumulated impairment (2 ) — — (2 ) Indefinite-lived intangible assets, net — — 333 333 Intangible assets, net $ 696 $ 1,916 $ 366 $ 2,978 Balance as of September 30, 2018 Finite-lived intangible assets: Cost $ 959 $ 2,157 $ 43 $ 3,159 Accumulated amortization (135 ) (124 ) (3 ) (262 ) Finite-lived intangible assets, net 824 2,033 40 2,897 Indefinite-lived intangible assets 5 — 332 337 Intangible assets, net $ 829 $ 2,033 $ 372 $ 3,234

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring	Assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and September 30, 2018 were as follows: June 30, 2019 September 30, 2018 Fair Value Measurements Using Fair Value Measurements Using (In millions) Total Level 1 Level 2 Level 3 Total Level 2 Level 3 Assets: Strategic investments $ 10 $ — $ — $ 10 $ — $ — $ — $ — Other investments — — — — 2 2 — — Interest rate contracts — — — — 3 — 3 — Foreign exchange contracts 2 — 2 — — — — — Total assets $ 12 $ — $ 2 $ 10 $ 5 $ 2 $ 3 $ — Liabilities: Interest rate contracts $ 75 $ — $ 75 $ — $ 7 $ — $ 7 $ — Spoken acquisition Earn-outs 5 — — 5 15 — — 15 Emergence Date Warrants 6 — — 6 34 — — 34 Total liabilities $ 86 $ — $ 75 $ 11 $ 56 $ — $ 7 $ 49
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table summarizes the activity for the Company's Level 3 liabilities measured at fair value on a recurring basis: (In millions) Emergence Date Warrants Spoken Acquisition Earn-outs Strategic Investments Total Balance as of September 30, 2018 $ 34 $ 15 $ — $ 49 Strategic investments — — 10 10 Change in fair value (1) (28 ) 1 — (27 ) Settlement — (11 ) — (11 ) Balance as of June 30, 2019 $ 6 $ 5 $ 10 $ 21 (1) Changes in fair value of the Emergence Date Warrants are included in Other income (expense), net.
Fair Value, by Balance Sheet Grouping	The estimated fair values of the amounts borrowed under the Company’s financing agreements at June 30, 2019 and September 30, 2018 are as follows: June 30, 2019 September 30, 2018 (In millions) Principal amount Fair value Principal amount Fair value Term Loan Credit Agreement due December 15, 2024 $ 2,881 $ 2,764 $ 2,903 $ 2,932 Convertible 2.25% senior notes due June 15, 2023 350 305 350 357 Total debt $ 3,231 $ 3,069 $ 3,253 $ 3,289

Benefit Obligations (Tables)

Benefit Obligations (Tables)	9 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs	The components of the pension and post-retirement net periodic benefit (credit) cost for the periods indicated are provided in the table below: Successor Predecessor (1) (In millions) Three months ended June 30, 2019 Three months ended June 30, 2018 Nine months ended June 30, 2019 Period from December 16, 2017 Period from Pension Benefits - U.S. Components of net periodic benefit (credit) cost Service cost $ 1 $ 1 $ 3 $ 2 $ 1 Interest cost 10 9 29 19 22 Expected return on plan assets (15 ) (17 ) (45 ) (35 ) (38 ) Amortization of actuarial loss — — — — 20 Net periodic benefit (credit) cost $ (4 ) $ (7 ) $ (13 ) $ (14 ) $ 5 Pension Benefits - Non-U.S. Components of net periodic benefit cost Service cost $ 2 $ 1 $ 5 $ 3 $ 2 Interest cost 2 3 7 5 3 Expected return on plan assets — — — — (1 ) Amortization of actuarial loss — — — — 2 Net periodic benefit cost $ 4 $ 4 $ 12 $ 8 $ 6 Post-retirement Benefits - U.S. Components of net periodic benefit cost Service cost $ — $ 1 $ 1 $ 1 $ — Interest cost 4 4 11 7 3 Expected return on plan assets (2 ) (3 ) (7 ) (5 ) (2 ) Amortization of prior service cost — — — — (3 ) Amortization of actuarial loss (1 ) — (1 ) — 2 Net periodic benefit cost $ 1 $ 2 $ 4 $ 3 $ — (1 ) Excludes Plan of Reorganization related settlements that were recorded in Reorganization items, net in the Condensed Consolidated Statements of Operations.

Net Income (Loss) Per Common _2

Net Income (Loss) Per Common Share (Tables)	9 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Schedule of Earnings (Loss) Per Share	The following table sets forth the calculation of net (loss) income attributable to common shareholders and the computation of basic and diluted (loss) earnings per share for the periods indicated: Successor Predecessor (In millions, except per share amounts) Three months ended June 30, 2019 Three months ended June 30, 2018 Nine months ended June 30, 2019 Period from December 16, 2017 Period from (Loss) earnings per share: Numerator Net (loss) income $ (633 ) $ (88 ) $ (637 ) $ 19 $ 2,977 Dividends and accretion to preferred stockholders — — — — (6 ) Undistributed (loss) income (633 ) (88 ) (637 ) 19 2,971 Percentage allocated to common stockholders (1) 100.0 % 100.0 % 100.0 % 100.0 % 86.9 % Numerator for basic and diluted (loss) earnings per common share $ (633 ) $ (88 ) $ (637 ) $ 19 $ 2,582 Denominator Denominator for basic (loss) earnings per weighted average common shares 111.0 109.8 110.7 109.8 497.3 Effect of dilutive securities Restricted stock units — — — 1.2 — Denominator for diluted (loss) earnings per weighted average common shares 111.0 109.8 110.7 111.0 497.3 (Loss) earnings per common share Basic $ (5.70 ) $ (0.80 ) $ (5.75 ) $ 0.17 $ 5.19 Diluted $ (5.70 ) $ (0.80 ) $ (5.75 ) $ 0.17 $ 5.19 (1) Basic weighted average common stock outstanding 111.0 109.8 110.7 109.8 497.3 Basic weighted average common stock and common stock equivalents (preferred shares) 111.0 109.8 110.7 109.8 572.4 Percentage allocated to common stockholders 100.0 % 100.0 % 100.0 % 100.0 % 86.9 %

Operating Segments (Tables)

Operating Segments (Tables)	9 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Summarized Financial Information of Operating Segments	Summarized financial information relating to the Company's operating segments is shown in the following table for the periods indicated: Successor Predecessor (In millions) Three months ended Three months ended Nine months ended Period from December 16, 2017 Period from REVENUE Products & Solutions $ 298 $ 322 $ 913 $ 716 $ 253 Services 422 433 1,269 967 351 Unallocated Amounts (1) (3 ) (63 ) (18 ) (171 ) — $ 717 $ 692 $ 2,164 $ 1,512 $ 604 GROSS PROFIT Products & Solutions $ 189 $ 210 $ 587 $ 473 $ 169 Services 249 257 759 582 196 Unallocated Amounts (2) (48 ) (115 ) (163 ) (302 ) (3 ) 390 352 1,183 753 362 OPERATING EXPENSES Selling, general and administrative 253 281 761 613 264 Research and development 49 51 154 110 38 Amortization of intangible assets 41 39 122 86 10 Impairment charges 659 — 659 — — Restructuring charges, net 1 30 12 80 14 1,003 401 1,708 889 326 OPERATING (LOSS) INCOME (613 ) (49 ) (525 ) (136 ) 36 INTEREST EXPENSE, OTHER INCOME (EXPENSE), NET AND REORGANIZATION ITEMS, NET (47 ) (19 ) (142 ) (80 ) 3,400 (LOSS) INCOME BEFORE INCOME TAXES $ (660 ) $ (68 ) $ (667 ) $ (216 ) $ 3,436 (1) Unallocated amounts in Revenue represent the fair value adjustment to deferred revenue recognized upon emergence from bankruptcy and excluded from segment revenue. (2) Unallocated amounts in Gross Profit include the fair value adjustments recognized upon emergence from bankruptcy and excluded from segment gross profit; the effect of the amortization of technology intangibles; and costs that are not core to the measurement of segment management’s performance, but rather are controlled at the corporate level.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive (Loss) Income (Tables)	9 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of Accumulated other comprehensive (loss) income for the periods indicated were as follows: (In millions) Change in Unamortized Pension, Post-retirement and Postemployment Benefit-related Items Foreign Currency Translation Unrealized Loss on Term Loan Interest Rate Swap Other Accumulated Other Comprehensive Income (Loss) Balance as of March 31, 2019 (Successor) $ 51 $ (12 ) $ (33 ) $ — $ 6 Other comprehensive loss before reclassifications (8 ) (10 ) (31 ) — (49 ) Amounts reclassified to earnings — — 2 — 2 Benefit from income taxes 2 — 7 — 9 Balance as of June 30, 2019 (Successor) $ 45 $ (22 ) $ (55 ) $ — $ (32 ) (In millions) Change in Unamortized Pension, Post-retirement and Postemployment Benefit-related Items Foreign Currency Translation Unrealized Loss on Term Loan Interest Rate Swap Other Accumulated Other Comprehensive Income (Loss) Balance as of September 30, 2018 (Successor) $ 51 $ (31 ) $ (2 ) $ — $ 18 Other comprehensive (loss) income before reclassifications (8 ) 9 (78 ) — (77 ) Amounts reclassified to earnings — — 7 — 7 Benefit from income taxes 2 — 18 — 20 Balance as of June 30, 2019 (Successor) $ 45 $ (22 ) $ (55 ) $ — $ (32 ) (In millions) Change in Unamortized Pension, Post-retirement and Postemployment Benefit-related Items Foreign Currency Translation Unrealized Loss on Term Loan Interest Rate Swap Other Accumulated Other Comprehensive Loss Balance as of March 31, 2018 (Successor) $ — $ (25 ) $ — $ — $ (25 ) Other comprehensive loss before reclassifications — (4 ) (17 ) — (21 ) Amounts reclassified to earnings — — 2 — 2 Benefit from income taxes — — 3 — 3 Balance as of June 30, 2018 (Successor) $ — $ (29 ) $ (12 ) $ — $ (41 ) (In millions) Change in Unamortized Pension, Post-retirement and Postemployment Benefit-related Items Foreign Currency Translation Unrealized Loss on Term Loan Interest Rate Swap Other Accumulated Other Comprehensive (Loss) Income Balance as of September 30, 2017 (Predecessor) $ (1,375 ) $ (72 ) $ — $ (1 ) $ (1,448 ) Other comprehensive (loss) income before reclassifications (24 ) 3 — — (21 ) Amounts reclassified to earnings 16 — — — 16 Pension settlement 721 — — — 721 Provision for income taxes (58 ) — — — (58 ) Balance as of December 15, 2017 (Predecessor) (720 ) (69 ) — (1 ) (790 ) Elimination of Predecessor Company Accumulated other comprehensive loss 720 69 — 1 790 Balance as of December 15, 2017 (Predecessor) $ — $ — $ — $ — $ — Balance as of December 16, 2017 (Successor) $ — $ — $ — $ — $ — Other comprehensive loss before reclassifications — (29 ) (17 ) — (46 ) Amounts reclassified to earnings — — 2 — 2 Benefit from income taxes — — 3 — 3 Balance as of June 30, 2018 (Successor) $ — $ (29 ) $ (12 ) $ — $ (41 )

Background and Basis of Prese_2

Background and Basis of Presentation - Narrative (Details) $ in Millions	3 Months Ended				7 Months Ended	9 Months Ended
	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)segment
Quantifying Misstatement in Current Year Financial Statements, Amount						$ 4
Number of segments | segment						2
Quantifying Misstatement in Current Year Financial Statements, Amount	$ (633)	$ (13)	$ 9	$ (88)	$ 19	$ (637)
Selling, General and Administrative Expenses [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount						$ 6

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Millions	2 Months Ended	7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2018	Jun. 30, 2019	Mar. 31, 2019	Oct. 01, 2018	Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase of net cash used in investing activities		$ (192)	$ (95)
Accounts receivable, net			276		$ 376	$ 377
Inventory			71		57	81
Contract assets			178		78	0
Contract costs			128		109	0
Other current assets			149		104	170
Property, Plant and Equipment, Net			243		249	250
Deferred income taxes, net			25		27	29
Other assets			109		90	74
Contract liabilities			470		467	484
Goodwill			2,105			2,764
Other current liabilities			130		152	148
Deferred income taxes, net			120		169	140
Other Liabilities, Noncurrent			390		372	374
Retained Earnings (Accumulated Deficit)			(255)		382	$ 287
Accounting Standards Update 2016-18 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase of net cash used in investing activities		$ (55)
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net					(1)
Inventory					(24)
Contract assets					78
Contract costs					109
Other current assets					(66)
Property, Plant and Equipment, Net					(1)
Deferred income taxes, net					(2)
Other assets					16
Contract liabilities					(17)
Other current liabilities					4
Deferred income taxes, net					29
Other Liabilities, Noncurrent					(2)
Retained Earnings (Accumulated Deficit)				$ 3
Predecessor
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase of net cash used in investing activities	$ (13)
Predecessor | Accounting Standards Update 2016-18 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase of net cash used in investing activities	$ (21)
Accumulated Deficit | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)			3	$ 3	95
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventory			33
Contract assets			(178)
Contract costs			(128)
Other current assets			100
Property, Plant and Equipment, Net			1
Deferred income taxes, net			2
Other assets			(10)
Contract liabilities			48
Other current liabilities			4
Deferred income taxes, net			(29)
Other Liabilities, Noncurrent			2
Retained Earnings (Accumulated Deficit)			(204)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accumulated Deficit | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)					97
Previously Reported [Member] | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)					92
Previously Reported [Member] | Accumulated Deficit | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)					$ 92
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract liabilities			2
Goodwill			$ 2

Revenue Recognition - Impact of

Revenue Recognition - Impact of Adoption (Details) - USD ($) $ in Millions	3 Months Ended				7 Months Ended	9 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Oct. 01, 2018	Sep. 30, 2018
ASSETS
Accounts receivable, net	$ 276					$ 276	$ 376	$ 377
Inventory	71					71	57	81
Contract assets	178					178	78	0
Contract costs	128					128	109	0
Other current assets	149					149	104	170
Property, plant and equipment, net	243					243	249	250
Deferred income taxes, net	25					25	27	29
Other assets	109					109	90	74
Accounts Payable, Current	292					292		266
LIABILITIES
Contract liabilities	470					470	467	484
Other current liabilities	130					130	152	148
Deferred income taxes, net	120					120	169	140
Other liabilities	390					390	372	374
STOCKHOLDERS' EQUITY
Retained Earnings (Accumulated Deficit)	(255)					(255)	382	$ 287
REVENUE
Revenue	(717)			$ (692)	$ (1,512)	(2,164)
Contract with Customer, Liability, Revenue Recognized	109					505
COSTS
Cost of Revenue	327			340	759	981
GROSS PROFIT	(390)			(352)	(753)	(1,183)
OPERATING EXPENSES
Selling, general and administrative	(253)			(281)	(613)	(761)
Research and development	(49)			(51)	(110)	(154)
Amortization of intangible assets	(41)			(39)	(86)	(122)
Asset Impairment Charges	659			0	0	659
Restructuring charges, net	(1)			(30)	(80)	(12)
Total operating Expenses	(1,003)			(401)	(889)	(1,708)
Operating Income (Loss) [Abstract]
OPERATING LOSS	613			49	136	525
Interest expense	(59)			(56)	(112)	(177)
Other income (expense), net	(12)			(37)	(32)	(35)
LOSS BEFORE INCOME TAXES	(660)			(68)	(216)	(667)
(Provision for) benefit from income taxes	(27)			20	(235)	(30)
Net income (loss)	(633)	$ (13)	$ 9	(88)	19	(637)
Accounting Standards Update 2014-09
ASSETS
Accounts receivable, net							(1)
Inventory							(24)
Contract assets							78
Contract costs							109
Other current assets							(66)
Property, plant and equipment, net							(1)
Deferred income taxes, net							(2)
Other assets							16
LIABILITIES
Contract liabilities							(17)
Other current liabilities							4
Deferred income taxes, net							29
Other liabilities							$ (2)
REVENUE
Revenue	(672)					(2,033)
COSTS
Total Cost of Goods and Services	(316)					(948)
GROSS PROFIT	(356)					(1,085)
OPERATING EXPENSES
Selling, general and administrative	(252)					(764)
Research and development	(49)					(154)
Amortization of intangible assets	(41)					(122)
Asset Impairment Charges	659					659
Restructuring charges, net	(1)					(12)
Total operating Expenses	(1,002)					(1,711)
Operating Income (Loss) [Abstract]
OPERATING LOSS	646					626
Interest expense	(59)					(177)
Other income (expense), net	(12)					(35)
LOSS BEFORE INCOME TAXES	(693)					(768)
(Provision for) benefit from income taxes	10					(22)
Net income (loss)	(703)					(746)
Adjustments | Accounting Standards Update 2014-09
ASSETS
Inventory	33					33
Contract assets	(178)					(178)
Contract costs	(128)					(128)
Other current assets	100					100
Property, plant and equipment, net	1					1
Deferred income taxes, net	2					2
Other assets	(10)					(10)
Accounts Payable, Current	(1)					(1)
LIABILITIES
Contract liabilities	48					48
Other current liabilities	4					4
Deferred income taxes, net	(29)					(29)
Other liabilities	2					2
STOCKHOLDERS' EQUITY
Retained Earnings (Accumulated Deficit)	(204)					(204)
Without Adoption of ASC 606
ASSETS
Inventory	104					104
Contract assets	0					0
Contract costs	0					0
Other current assets	249					249
Property, plant and equipment, net	244					244
Deferred income taxes, net	27					27
Other assets	99					99
Accounts Payable, Current	291					291
LIABILITIES
Contract liabilities	518					518
Other current liabilities	134					134
Deferred income taxes, net	91					91
Other liabilities	392					392
STOCKHOLDERS' EQUITY
Retained Earnings (Accumulated Deficit)	(459)					(459)
Products
REVENUE
Revenue	(297)			(300)	(664)	(908)
COSTS
Total Cost of Goods and Services	(109)			(114)	(257)	(329)
Amortization of technology intangible assets	(43)			(44)	(92)	(130)
Products | Accounting Standards Update 2014-09
REVENUE
Revenue	(271)					(837)
COSTS
Total Cost of Goods and Services	(105)					(316)
Amortization of technology intangible assets	(43)					(130)
Services
REVENUE
Revenue	(420)			(392)	(848)	(1,256)
COSTS
Total Cost of Goods and Services	(175)			$ (182)	$ (410)	(522)
Services | Accounting Standards Update 2014-09
REVENUE
Revenue	(401)					(1,196)
COSTS
Total Cost of Goods and Services	(168)					(502)
Adjustments
LIABILITIES
Contract liabilities	2					2
Adjustments | Accounting Standards Update 2014-09
REVENUE
Revenue	(45)					131
COSTS
Total Cost of Goods and Services	(11)					33
GROSS PROFIT	(34)					98
OPERATING EXPENSES
Selling, general and administrative	(1)					(3)
Research and development	0					0
Amortization of intangible assets	0					0
Asset Impairment Charges	0					0
Restructuring charges, net	0					0
Total operating Expenses	(1)					(3)
Operating Income (Loss) [Abstract]
OPERATING LOSS	(33)					101
Interest expense	0					0
Other income (expense), net	0					0
LOSS BEFORE INCOME TAXES	33					(101)
(Provision for) benefit from income taxes	(37)					8
Net income (loss)	70					(109)
Adjustments | Products | Accounting Standards Update 2014-09
REVENUE
Revenue	(26)					71
COSTS
Total Cost of Goods and Services	(4)					13
Amortization of technology intangible assets	0					0
Adjustments | Services | Accounting Standards Update 2014-09
REVENUE
Revenue	(19)					60
COSTS
Total Cost of Goods and Services	$ (7)					$ 20

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost to Obtain a Contract, Amortization	$ 27	$ 73
Capitalized Contract Cost to Fulfill, Amortization	11	31
Revenue recognized that was previously recorded as a contract liability	109	505
Revenue, Remaining Performance Obligation, Amount	$ 2,700	2,700
Selling, General and Administrative Expenses
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost to Obtain a Contract, Amortization		70
Cost of Sales [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost to Obtain a Contract, Amortization		$ 3

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		7 Months Ended	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period				$ 5
Revenue	$ 717	$ 692	$ 1,512	2,164
U.S.
Disaggregation of Revenue [Line Items]
Revenue	392			1,161
International
Disaggregation of Revenue [Line Items]
Revenue	325			1,003
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenue	183			570
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	85			242
Americas International - Canada and Latin America
Disaggregation of Revenue [Line Items]
Revenue	57			191
Products & Solutions
Disaggregation of Revenue [Line Items]
Revenue	298			913
Products & Solutions | U.S.
Disaggregation of Revenue [Line Items]
Revenue	149			429
Products & Solutions | International
Disaggregation of Revenue [Line Items]
Revenue	149			484
Products & Solutions | Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenue	91			290
Products & Solutions | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	38			113
Products & Solutions | Americas International - Canada and Latin America
Disaggregation of Revenue [Line Items]
Revenue	20			81
Services
Disaggregation of Revenue [Line Items]
Revenue	422			1,269
Services | U.S.
Disaggregation of Revenue [Line Items]
Revenue	245			744
Services | International
Disaggregation of Revenue [Line Items]
Revenue	177			525
Services | Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenue	93			283
Services | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	47			131
Services | Americas International - Canada and Latin America
Disaggregation of Revenue [Line Items]
Revenue	37			111
Unallocated
Disaggregation of Revenue [Line Items]
Revenue	(3)	$ (63)	$ (171)	(18)
Unallocated | U.S.
Disaggregation of Revenue [Line Items]
Revenue	(2)			(12)
Unallocated | International
Disaggregation of Revenue [Line Items]
Revenue	(1)			(6)
Unallocated | Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenue	(1)			(3)
Unallocated | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	0			(2)
Unallocated | Americas International - Canada and Latin America
Disaggregation of Revenue [Line Items]
Revenue	$ 0			$ (1)
Minimum | Professional Services, simple contracts
Disaggregation of Revenue [Line Items]
Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment				P28D
Minimum | Global Support Services
Disaggregation of Revenue [Line Items]
Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment				P1Y
Minimum | Professional Services, complex contracts
Disaggregation of Revenue [Line Items]
Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment				P6M
Minimum | Cloud and Managed Services
Disaggregation of Revenue [Line Items]
Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment				P1Y
Maximum | Professional Services, simple contracts
Disaggregation of Revenue [Line Items]
Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment				P42D
Maximum | Global Support Services
Disaggregation of Revenue [Line Items]
Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment				P5Y
Maximum | Professional Services, complex contracts
Disaggregation of Revenue [Line Items]
Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment				P1Y
Maximum | Cloud and Managed Services
Disaggregation of Revenue [Line Items]
Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment				P5Y

Revenue Recognition - Transacti

Revenue Recognition - Transaction Price Allocated to the Remaining Performance Obligations (Details) $ in Millions	Jun. 30, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 2,700
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	1 year
Remaining performance obligation, amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	1 year
Remaining performance obligation, amount	$ 0

Revenue Recognition - Contract

Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2019	Oct. 01, 2018	Sep. 30, 2018
Accounts receivable, net
Accounts receivable, net	$ 276	$ 376	$ 377
Increase (decrease) in accounts receivable, net	(100)
Contract assets:
Contract assets, current	178	78	0
Increase (decrease) in contract assets, current	100
Contract assets, non-current	3	3
Increase (decrease) in contract assets, non-current	0
Total contract assets	181	81
Increase (decrease) in total contract assets	100
Cost of obtaining a contract:
Cost of obtaining a contract, current	88	64
Increase (decrease) in cost of obtaining a contract, current	24
Cost of obtaining a contract, non-current	44	36
Increase (decrease) in cost of obtaining a contract, non-current	8
Total cost of obtaining a contract	132	100
Increase (decrease) in total cost of obtaining a contract	32
Cost to fulfill a contract:
Cost incurred to fulfill a contract, current	40	45
Increase (decrease) in cost incurred to fulfill a contract, current	(5)
Contract liabilities:
Contract liabilities, current	470	467	$ 484
Increase (decrease) in contract liabilities, current	3
Contract liabilities, non-current	76	52
Increase (decrease) in contract liabilities, non-current	24
Total contract liabilities	546	$ 519
Increase (decrease) in total contract liabilities	$ 27

Business Combinations (Details)

Business Combinations (Details) - USD ($) $ in Millions	Mar. 09, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Payments to Acquire Investments				$ 0	$ 10
Payments to Acquire Investments		$ 10			$ 10
Investment Interest Rate					8.00%
Common Stock, Terms of Conversion					0.273
Debt Securities, Available-for-sale		10			$ 10
Goodwill		2,105			2,105	$ 2,764
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)					2
Revenue		717	$ 692	1,512	2,164
Operating income (loss)		(613)	$ (49)	$ (136)	(525)
Spoken
Business Acquisition [Line Items]
Purchase price	$ 172
Cash considerations	157
Contingent consideration	14	$ 5			5
Net payable to company in settlement of contingent consideration	1
Goodwill	117
Net liabilities acquired	9
Fair value of intangible assets acquired	$ 64
Revenue					8
Operating income (loss)					(21)
Estimate of Fair Value Measurement | Spoken
Business Acquisition [Line Items]
Performance targets	3
Former Owners and Employees | Spoken
Business Acquisition [Line Items]
Contingent consideration	$ 16
Business Combination, Contingent Consideration, Payment					11
Spoken Employees | Spoken
Business Acquisition [Line Items]
Contingent consideration	4
Business Combination, Contingent Consideration, Payment					$ 2
Technology-Based Intangible Assets | Spoken
Business Acquisition [Line Items]
Acquired intangible assets	56
In Process Research and Development | Spoken
Business Acquisition [Line Items]
Acquired intangible assets	$ 3
Maximum | Technology-Based Intangible Assets | Spoken
Business Acquisition [Line Items]
Acquired intangible assets, weighted average useful life	4 years 11 months
In Process Research and Development | Spoken
Business Acquisition [Line Items]
Acquired intangible assets	$ 5
Acquired intangible assets, weighted average useful life					5 years
Customer relationships and other intangibles | Spoken
Business Acquisition [Line Items]
Acquired intangible assets	$ 3
Acquired intangible assets, weighted average useful life	7 years 6 months

Goodwill - Schedule of Goodwill

Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2018
Goodwill [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 335
Goodwill [Roll Forward]
Goodwill, Beginning Balance	2,764
Impairment loss	(657)
Goodwill, Other Increase (Decrease)	2
Goodwill, Ending Balance	2,105
Indefinite-lived Intangible Assets (Excluding Goodwill), Accumulated Impairment Loss	(2)
Indefinite-Lived Intangible Assets (Excluding Goodwill And Accumulated Impairment)	333	$ 337
Intangible assets, net	2,978	3,234
Products & Solutions
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,283
Impairment loss	(657)
Goodwill, Other Increase (Decrease)	0
Goodwill, Ending Balance	626
Services
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,481
Impairment loss	0
Goodwill, Other Increase (Decrease)	2
Goodwill, Ending Balance	1,479
Acquired Technology and Patents [Member]
Goodwill [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	2
Goodwill [Roll Forward]
Indefinite-lived Intangible Assets (Excluding Goodwill), Accumulated Impairment Loss	(2)
Indefinite-Lived Intangible Assets (Excluding Goodwill And Accumulated Impairment)	0	5
Customer relationships and other intangibles
Goodwill [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	0
Goodwill [Roll Forward]
Indefinite-lived Intangible Assets (Excluding Goodwill), Accumulated Impairment Loss	0
Indefinite-Lived Intangible Assets (Excluding Goodwill And Accumulated Impairment)	0	0
Trademarks and Trade Names [Member]
Goodwill [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	333
Goodwill [Roll Forward]
Indefinite-lived Intangible Assets (Excluding Goodwill), Accumulated Impairment Loss	0
Indefinite-Lived Intangible Assets (Excluding Goodwill And Accumulated Impairment)	333	332
Trademarks and Trade Names [Member]
Goodwill [Roll Forward]
Intangible assets, net	366	372
Customer relationships and other intangibles
Goodwill [Roll Forward]
Intangible assets, net	1,916	2,033
Acquired Technology and Patents [Member]
Goodwill [Roll Forward]
Intangible assets, net	$ 696	$ 829

Goodwill - Narrative (Details)

Goodwill - Narrative (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Sep. 30, 2018
Goodwill [Line Items]
Asset Impairment Charges		$ 659	$ 0	$ 0	$ 659
Goodwill		$ 2,105			$ 2,105	$ 2,764
Goodwill, measurement input		6500.00%			6500.00%
Fair value in excess of carrying amount, percent		0.00%			0.00%
Impairment loss					$ (657)
Goodwill, Decrease In Discount Rate Resulting In An Estimated Fair Value Below The Carrying Value		9500.00%			9500.00%
Products & Solutions
Goodwill [Line Items]
Goodwill		$ 626			$ 626	1,283
Impairment loss					(657)
Services
Goodwill [Line Items]
Goodwill		1,479			1,479	$ 1,481
Impairment loss					0
Predecessor
Goodwill [Line Items]
Asset Impairment Charges	$ 0
Global Support Services [Member]
Goodwill [Line Items]
Goodwill		1,446			1,446
Contact Center Solutions [Member]
Goodwill [Line Items]
Goodwill		$ 197			197
Impairment loss					$ (657)

Supplementary Financial Infor_3

Supplementary Financial Information - Consolidated Statements of Operations Information (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
OTHER INCOME (EXPENSE), NET
Interest income		$ 4	$ 1	$ 2	$ 11
Foreign currency (losses) gains, net		(1)	25	24	(8)
Income from transition services agreement, net		0	1	5	0
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component		1	4	9	5
Change in fair value of emergence date warrants		7	6	(9)	28
Other, net		1	0	1	(1)
Total other income (expense), net		$ 12	$ 37	$ 32	$ 35
Predecessor
OTHER INCOME (EXPENSE), NET
Interest income	$ 2
Foreign currency (losses) gains, net	0
Income from transition services agreement, net	3
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(8)
Change in fair value of emergence date warrants	0
Other, net	1
Total other income (expense), net	$ (2)

Supplementary Financial Infor_4

Supplementary Financial Information - Reorganization Items (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Supplementary Financial Information [Line Items]
Net gain on settlement of Liabilities subject to compromise				$ 0	$ 0
Net gain on fresh start adjustments				0	0
Reorganization items, net		$ 0	$ 0	$ 0	$ 0
Predecessor
Supplementary Financial Information [Line Items]
Net gain on settlement of Liabilities subject to compromise	$ 1,778
Net gain on fresh start adjustments	1,697
Bankruptcy-related professional fees	(56)
Other items, net	(3)
Reorganization items, net	3,416
Cash payments for reorganization items	2,524
Claims paid	2,468
Payments for emergence and success fees	$ 56

Supplementary Financial Infor_5

Supplementary Financial Information - Supplementary Cash Flow Information (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Other Significant Noncash Transactions [Line Items]
Restricted Cash, Current	$ 65	$ 0	$ 10	$ 10	$ 0	$ 0	$ 85
Restricted Cash, Noncurrent	4	5	4	4	5	4	5
Cash	366	729	685	685	729	700	876
OTHER PAYMENTS
Interest payments		61	52	99	160
Income tax payments		13	8	17	48
NON-CASH INVESTING ACTIVITIES
Increase (decrease) in Accounts payable for Capital expenditures		(6)	5	5	(1)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	435	$ 734	$ 699	$ 699	$ 734	$ 704	966
Predecessor
OTHER PAYMENTS
Interest payments	15
Income tax payments	7
NON-CASH INVESTING ACTIVITIES
Increase (decrease) in Accounts payable for Capital expenditures	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 435						$ 966

Business Restructuring Reserv_3

Business Restructuring Reserves and Programs (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 1	$ 30	$ 80	$ 12
Restructuring Reserve [Roll Forward]
Cash payments					(5)
Impact of foreign currency fluctuations					1
Restructuring Reserve, ending balance		6			6
Fiscal 2018 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment					1
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance					54
Cash payments					(15)
Impact of foreign currency fluctuations					(1)
Restructuring Reserve, ending balance		37			37
Fiscal 2019 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges					12
Fiscal 2008-2015 Restructuring Programs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment					(1)
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance					44
Cash payments					(14)
Impact of foreign currency fluctuations					(1)
Restructuring Reserve, ending balance		30			30
Employee Separation Costs | Fiscal 2018 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment					1
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance					54
Cash payments					(15)
Impact of foreign currency fluctuations					(1)
Restructuring Reserve, ending balance		37			37
Employee Separation Costs | Fiscal 2019 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges					10
Restructuring Reserve [Roll Forward]
Cash payments					(5)
Impact of foreign currency fluctuations					1
Restructuring Reserve, ending balance		4			4
Employee Separation Costs | Fiscal 2008-2015 Restructuring Programs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment					(1)
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance					38
Cash payments					(12)
Impact of foreign currency fluctuations					(1)
Restructuring Reserve, ending balance		26			26
Lease Obligations | Fiscal 2018 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment					0
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance					0
Cash payments					0
Impact of foreign currency fluctuations					0
Restructuring Reserve, ending balance		0			0
Lease Obligations | Fiscal 2019 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges					2
Restructuring Reserve [Roll Forward]
Cash payments					0
Impact of foreign currency fluctuations					0
Restructuring Reserve, ending balance		2			2
Lease Obligations | Fiscal 2008-2015 Restructuring Programs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment					0
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance					6
Cash payments					(2)
Impact of foreign currency fluctuations					0
Restructuring Reserve, ending balance		$ 4			$ 4
Predecessor
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 14

Financing Arrangements - Sched

Financing Arrangements - Schedule of Debt (Details) - USD ($)	Jun. 30, 2019	Sep. 30, 2018	Jun. 11, 2018
Debt Instrument [Line Items]
Principal	$ 3,231,000,000	$ 3,253,000,000
Net of discounts and issuance costs	3,120,000,000	3,126,000,000
Debt maturing within one year	(29,000,000)	(29,000,000)
Long-term debt, net of current portion	3,091,000,000	3,097,000,000
Term Loan Credit Agreement due December 15, 2024
Debt Instrument [Line Items]
Principal	2,881,000,000	2,903,000,000
Net of discounts and issuance costs	2,852,000,000	2,870,000,000
Convertible 2.25% senior notes due June 15, 2023
Debt Instrument [Line Items]
Principal	350,000,000	350,000,000	$ 350,000,000
Net of discounts and issuance costs	$ 268,000,000	$ 256,000,000

Financing Arrangements - Narra

Financing Arrangements - Narrative (Details) - USD ($)	Jun. 18, 2018	Dec. 15, 2017	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Sep. 30, 2018	Jun. 11, 2018
Debt Instrument [Line Items]
Debt face amount				$ 3,231,000,000			$ 3,231,000,000	$ 3,253,000,000
Weighted average contractual interest rate of debt				6.50%			6.50%	6.40%
Amortization of debt issuance costs				$ 4,000,000		$ 1,000,000	$ 12,000,000
Term Loan
Debt Instrument [Line Items]
Debt face amount				2,881,000,000			2,881,000,000	$ 2,903,000,000
Interest expense on debt				51,000,000	$ 50,000,000	$ 106,000,000	151,000,000
Term Loan | Term Loan Credit Agreement due December 15, 2024
Debt Instrument [Line Items]
Debt face amount		$ 2,925,000,000	$ 2,925,000,000
Term Loan | Revolving Credit Facility | LIBOR Loans | Floor | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.00%	1.00%
Line of Credit | Revolving Credit Facility | ABL Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity		$ 300,000,000	300,000,000
Line of Credit | Letter of Credit | ABL Credit Agreement
Debt Instrument [Line Items]
Letters of credit, maximum amount		$ 150,000,000	150,000,000
Letters of credit outstanding				45,000,000			45,000,000
Letter of credit, remaining borrowing capacity				139,000,000			139,000,000
Debt Related Commitment Fees and Debt Issuance Costs							1,000,000
Convertible Notes
Debt Instrument [Line Items]
Debt face amount				350,000,000			350,000,000	350,000,000	$ 350,000,000
Interest rate, stated percentage									2.25%
Interest expense on debt				$ 6,000,000			$ 18,000,000	1,000,000
Effective interest rate				9.20%			9.20%
Over-Allotment Option | Convertible Notes
Debt Instrument [Line Items]
Debt face amount									$ 50,000,000
Other liabilities
Debt Instrument [Line Items]
Capital lease obligations				$ 20,000,000			$ 20,000,000	31,000,000
Sale Lease Back Transaction [Member] | Avaya Private Cloud Services Business | Other liabilities
Debt Instrument [Line Items]
Capital lease obligations				$ 16,000,000			$ 16,000,000	$ 26,000,000
Predecessor [Member]
Debt Instrument [Line Items]
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations			94,000,000
Amortization of debt issuance costs			$ 0

Financing Arrangements - Carry

Financing Arrangements - Carrying Amount of Convertible Debt (Details) - USD ($)	Jun. 30, 2019	Sep. 30, 2018	Jun. 11, 2018
Debt Instrument [Line Items]
Principal	$ 3,231,000,000	$ 3,253,000,000
Convertible Notes
Debt Instrument [Line Items]
Principal	350,000,000	350,000,000	$ 350,000,000
Less:
Unamortized debt discount	(76,000,000)	(87,000,000)
Unamortized issuance costs	(6,000,000)	(7,000,000)
Net carrying amount	$ 268,000,000	$ 256,000,000

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Narrative (Details) $ / shares in Units, $ in Millions	May 16, 2018counterparty	Jun. 30, 2019USD ($)agreement	Nov. 14, 2018USD ($)	Dec. 15, 2017$ / sharesshares
Derivative [Line Items]
Number of counterparties | counterparty	6
Class of warrant or right, number of securities called by each warrant or right (in shares) | shares				5,645,200
Class of warrant or right, exercise price of warrants or rights (in USD per share) | $ / shares				$ 25.55
Warrant Repurchase Program, Number of Securities Called by Warrants or Rights, Authorized Amount			$ 15
Warrant Repurchase Program, Number of Securities Called by Warrants or Rights, Number of Warrants Repurchased		$ 0
Interest rate contracts
Derivative [Line Items]
Derivative fixed interest rate	2.935%
Number of instruments held (agreement) | agreement		6
Derivative notional amount		$ 1,800
Expected gain (loss) to be reclassified within twelve months		20
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative notional amount		$ 355

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Assumptions Used (Details)	Jun. 30, 2019year$ / shares	Sep. 30, 2018year$ / shares
Expected volatility
Derivative [Line Items]
Warrants, measurement input	0.5756	0.5014
Risk-free interest rates
Derivative [Line Items]
Warrants, measurement input	0.0171	0.0290
Contractual remaining life (in years)
Derivative [Line Items]
Warrants, measurement input | year	3.46	4.21
Warrants
Derivative [Line Items]
Price per share of common stock (in usd per share) | $ / shares	$ 11.91	$ 22.14

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Derivative Asset	$ 2	$ 3
Derivative Liability	81
Derivatives Designated as Hedging Instruments:
Derivative [Line Items]
Derivative Asset	0
Derivative Liability	75
Derivatives Designated as Hedging Instruments: | Other assets | Interest rate contracts
Derivative [Line Items]
Derivative Asset	0	3
Derivative Liability	0	0
Derivatives Designated as Hedging Instruments: | Other current liabilities | Interest rate contracts
Derivative [Line Items]
Derivative Asset	0	0
Derivative Liability	19	7
Derivatives Designated as Hedging Instruments: | Other liabilities | Interest rate contracts
Derivative [Line Items]
Derivative Asset	0	0
Derivative Liability	56	0
Derivatives Not Designated as Hedging Instruments:
Derivative [Line Items]
Derivative Asset	2	0
Derivative Liability	6	34
Derivatives Not Designated as Hedging Instruments: | Other current liabilities | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset		0
Derivative Liability	0	0
Derivatives Not Designated as Hedging Instruments: | Other liabilities | Warrants
Derivative [Line Items]
Derivative Asset	0	0
Derivative Liability	6	34
Derivatives Not Designated as Hedging Instruments: | Other Current Assets [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset	$ 2
Predecessor | Derivatives Designated as Hedging Instruments:
Derivative [Line Items]
Derivative Asset		3
Derivative Liability		$ 7

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Derivatives Designated as Cash Flow Hedges (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended				7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Derivative [Line Items]
Interest expense		$ (59)			$ (56)	$ (112)	$ (177)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		(38)	$ 8	$ (20)	(16)	(41)	(50)
Accumulated Other Comprehensive (Loss) Income
Derivative [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		(38)	$ 8	$ (20)	(16)	(41)	(50)
Interest Expense [Member] | Derivatives Designated as Hedging Instruments:
Derivative [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion		0			0	0	0
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net		(2)			(2)	(2)	(7)
Other Comprehensive Income (Loss) [Member] | Derivatives Designated as Hedging Instruments:
Derivative [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion		(31)			(17)	(17)	(78)
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net		$ 2			$ 2	$ 2	$ 7
Predecessor [Member]
Derivative [Line Items]
Interest expense	$ (14)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	658
Predecessor [Member] | Accumulated Other Comprehensive (Loss) Income
Derivative [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	658
Predecessor [Member] | Interest Expense [Member] | Derivatives Designated as Hedging Instruments:
Derivative [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	0
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	0
Predecessor [Member] | Other Comprehensive Income (Loss) [Member] | Derivatives Designated as Hedging Instruments:
Derivative [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	0
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ 0

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		$ 81			$ 81
Predecessor
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability						$ 41
Other income (expense), net | Derivatives Not Designated as Hedging Instruments: | Emergence Date Warrants
Derivative [Line Items]
Derivative, gain (loss)		7	$ 6	$ (9)	28
Other income (expense), net | Derivatives Not Designated as Hedging Instruments: | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative, gain (loss)		$ (1)	$ 0	$ 0	$ (1)
Other income (expense), net | Predecessor | Derivatives Not Designated as Hedging Instruments: | Emergence Date Warrants
Derivative [Line Items]
Derivative, gain (loss)	$ 0
Other income (expense), net | Predecessor | Derivatives Not Designated as Hedging Instruments: | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative, gain (loss)	$ 0

Derivative Instruments and He_8

Derivative Instruments and Hedging Activities - Presented on a Net Basis (Details) - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Gross amounts recognized in the consolidated balance sheet, Asset	$ 2	$ 3
Gross amounts recognized in the consolidated balance sheet, Liability	81
Gross amount subject to offset in master netting arrangements not offset in the Consolidated Balance Sheet, Asset	(2)	(3)
Gross amount subject to offset in master netting arrangements not offset in the Consolidated Balance Sheet, Liability	(2)	(3)
Derivative Asset	0
Derivative Liability	$ 79
Predecessor
Derivative [Line Items]
Gross amounts recognized in the consolidated balance sheet, Liability		41
Derivative Asset		0
Derivative Liability		$ 38

Intangible Assets (Details)

Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2018
Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 3,159	$ 3,159
Accumulated amortization	(514)	(262)
Finite-lived intangible assets, net	2,645	2,897
Indefinite-lived intangible assets, net	333	337
Intangible assets, net	2,978	3,234
Acquired technology and patents
Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	961	959
Accumulated amortization	(265)	(135)
Finite-lived intangible assets, net	696	824
Customer relationships and other intangibles
Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	2,156	2,157
Accumulated amortization	(240)	(124)
Finite-lived intangible assets, net	1,916	2,033
Trademarks and trade names
Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	42	43
Accumulated amortization	(9)	(3)
Finite-lived intangible assets, net	33	40
Acquired technology and patents
Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, net	0	5
Customer relationships and other intangibles
Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, net	0	0
Trademarks and trade names
Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, net	333	332
Trademarks and trade names
Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, net	366	372
Customer relationships and other intangibles
Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, net	1,916	2,033
Acquired technology and patents
Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, net	$ 696	$ 829

Intangible Assets - Narrative (

Intangible Assets - Narrative (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Asset Impairment Charges		$ 659	$ 0	$ 0	$ 659
Indefinite-lived Intangible Assets (Excluding Goodwill), Accumulated Impairment Loss		2			2
Predecessor
Finite-Lived Intangible Assets [Line Items]
Asset Impairment Charges	$ 0
Acquired Technology and Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill), Accumulated Impairment Loss		2			2
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill), Accumulated Impairment Loss		$ 0			$ 0

Fair Value Measurements - Asse

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 12	$ 5
Liabilities	86	56
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	2
Liabilities	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	2	3
Liabilities	75	7
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	10	0
Liabilities	11	49
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	10	0
Corporate Debt Securities [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Corporate Debt Securities [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Corporate Debt Securities [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	10	0
Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	2
Investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	2
Investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	3
Liabilities	75	7
Interest rate contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Liabilities	0	0
Interest rate contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	3
Liabilities	75	7
Interest rate contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Liabilities	0	0
Spoken acquisition Earn-outs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	5	15
Spoken acquisition Earn-outs | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Spoken acquisition Earn-outs | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Spoken acquisition Earn-outs | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities		15
Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	2	0
Foreign currency forward contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Foreign currency forward contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	2	0
Foreign currency forward contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Emergence Date Warrants | Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	6	34
Emergence Date Warrants | Foreign currency forward contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Emergence Date Warrants | Foreign currency forward contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Emergence Date Warrants | Foreign currency forward contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	$ 6	$ 34

Fair Value Measurements - Leve

Fair Value Measurements - Level 3 Liabilities Measured at Fair Value on a Recurring Basis (Details) - Level 3 $ in Millions	9 Months Ended
	Jun. 30, 2019USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases	$ 10
Fair value of derivative liability, beginning balance	49
Change in fair value	(27)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	11
Fair value of derivative liability, ending balance	21
Emergence Date Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases	0
Fair value of derivative liability, beginning balance	34
Change in fair value	(28)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	0
Fair value of derivative liability, ending balance	6
Spoken acquisition Earn-outs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases	0
Fair value of derivative liability, beginning balance	15
Change in fair value	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	11
Fair value of derivative liability, ending balance	5
Investments [Domain]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases	10
Fair value of derivative liability, beginning balance	0
Change in fair value	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	0
Fair value of derivative liability, ending balance	$ 10

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($)	Jun. 30, 2019	Sep. 30, 2018	Jun. 11, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt face amount	$ 3,231,000,000	$ 3,253,000,000
Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	3,069,000,000	3,289,000,000
Term Loan Credit Agreement due December 15, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt face amount	2,881,000,000	2,903,000,000
Term Loan Credit Agreement due December 15, 2024 | Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	2,764,000,000	2,932,000,000
Convertible 2.25% senior notes due June 15, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt face amount	350,000,000	350,000,000	$ 350,000,000
Convertible 2.25% senior notes due June 15, 2023 | Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 305,000,000	$ 357,000,000

Income Taxes - Income Taxes Nar

Income Taxes - Income Taxes Narrative (Details) - USD ($) $ in Billions	2 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019
Revenue, Remaining Performance Obligation, Amount		$ 2.7
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
Predecessor [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%

Benefit Obligations - Narrativ

Benefit Obligations - Narrative (Details) $ in Millions	9 Months Ended
	Jun. 30, 2019USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment	$ 8
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	11
Reimbursement of prior period payments	(3)
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in current fiscal year	5
U.S. | Postretirement Health Coverage
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in current fiscal year	3
Non-US
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	19
Non-US | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in current fiscal year	6
Not Pre-Funded | U.S.
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 22

Benefit Obligations - Componen

Benefit Obligations - Components of the Pension and Post-Retirement Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
U.S. | Pension Plan
Components of net periodic benefit (credit) cost
Service cost		$ 1	$ 1	$ 2	$ 3
Interest cost		10	9	19	29
Expected return on plan assets		(15)	(17)	(35)	(45)
Amortization of actuarial loss		0	0	0	0
Net periodic benefit cost (credit)		(4)	(7)	(14)	(13)
U.S. | Pension Plan | Predecessor
Components of net periodic benefit (credit) cost
Service cost	$ 1
Interest cost	22
Expected return on plan assets	(38)
Amortization of actuarial loss	20
Net periodic benefit cost (credit)	5
U.S. | Post-retirement Benefits
Components of net periodic benefit (credit) cost
Service cost		0	1	1	1
Interest cost		4	4	7	11
Expected return on plan assets		(2)	(3)	(5)	(7)
Amortization of prior service cost		0	0	0	0
Amortization of actuarial loss		(1)	0	0	(1)
Net periodic benefit cost (credit)		1	2	3	4
U.S. | Post-retirement Benefits | Predecessor
Components of net periodic benefit (credit) cost
Service cost	0
Interest cost	3
Expected return on plan assets	(2)
Amortization of prior service cost	(3)
Amortization of actuarial loss	2
Net periodic benefit cost (credit)	0
Non-US | Pension Plan
Components of net periodic benefit (credit) cost
Service cost		2	1	3	5
Interest cost		2	3	5	7
Expected return on plan assets		0	0	0	0
Amortization of actuarial loss		0	0	0	0
Net periodic benefit cost (credit)		$ 4	$ 4	$ 8	$ 12
Non-US | Pension Plan | Predecessor
Components of net periodic benefit (credit) cost
Service cost	2
Interest cost	3
Expected return on plan assets	(1)
Amortization of actuarial loss	2
Net periodic benefit cost (credit)	$ 6

Share-based Compensation (Detai

Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 8	$ 7	$ 13	$ 19
Performance Shares [Member] | Director | 2017 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					1 year
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					1,686,004
Grants in period, weighted average grant date fair value (in dollars per share)					$ 15.46
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period					1,484,659
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value					$ 15.49
Restricted stock units | 2017 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
Market-Based Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					274,223
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate					53.76%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate					2.45%
Grants in period, weighted average grant date fair value (in dollars per share)					$ 11.18
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award					23.50
Performance-Based Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					182,020
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate					53.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate					2.46%
Predecessor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated compensation cost	$ 3

Capital Stock - Narrative (Deta

Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 30, 2019	Nov. 14, 2018	Sep. 30, 2018
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	55,000,000
Preferred stock, par value (in usd per share)	$ 0.01
Preferred shares issued	0		0
Common stock, shares authorized	550,000,000		550,000,000
Common stock, par value (usd per share)	$ 0.01		$ 0.01
Common stock, shares issued	110,887,967		110,218,653
Common stock, shares outstanding	110,875,287		110,012,790
Common stock, issued for GUC (shares)	12,680		205,863
Warrant repurchase program, authorized amount		$ 15
Warrant Repurchase Program, Number of Securities Called by Warrants or Rights, Number of Warrants Repurchased	$ 0
As Previously Reported
Class of Stock [Line Items]
Common stock, shares issued	110,887,967		110,218,653

Net Income (Loss) Per Common _3

Net Income (Loss) Per Common Share - Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	2 Months Ended	3 Months Ended				7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Numerator
Net income (loss)		$ (633)	$ (13)	$ 9	$ (88)	$ 19	$ (637)
Dividends and accretion to preferred stockholders		0			0	0	0
Undistributed (loss) income		$ (633)			$ (88)	$ 19	$ (637)
Percentage allocated to common stockholders		100.00%			100.00%	100.00%	100.00%
Numerator for basic and diluted (loss) earnings per common share		$ (633)			$ (88)	$ 19	$ (637)
Weighted average shares outstanding
Denominator for basic earnings per weighted average common shares (in shares)		111			109.8	109.8	110.7
Effect of dilutive securities
Denominator for diluted earnings (loss) per weighted average common shares (in shares)		111			109.8	111	110.7
(Loss) earnings per common share
Basic (in usd per share)		$ (5.70)			$ (0.80)	$ 0.17	$ (5.75)
Diluted (in usd per share)		$ (5.70)			$ (0.80)	$ 0.17	$ (5.75)
Weighted average number of shares - basic (in shares)		111			109.8	109.8	110.7
Basic weighted average common stock and common stock equivalents (preferred shares) (in shares)		111			109.8	109.8	110.7
Restricted stock units
Effect of dilutive securities
Share-based payment arrangements (in shares)		0			0	1.2	0
Predecessor
Numerator
Net income (loss)	$ 2,977
Dividends and accretion to preferred stockholders	(6)
Undistributed (loss) income	$ 2,971
Percentage allocated to common stockholders	86.90%
Numerator for basic and diluted (loss) earnings per common share	$ 2,582
Weighted average shares outstanding
Denominator for basic earnings per weighted average common shares (in shares)	497.3
Effect of dilutive securities
Denominator for diluted earnings (loss) per weighted average common shares (in shares)	497.3
(Loss) earnings per common share
Basic (in usd per share)	$ 5.19
Diluted (in usd per share)	$ 5.19
Weighted average number of shares - basic (in shares)	497.3
Basic weighted average common stock and common stock equivalents (preferred shares) (in shares)	572.4
Predecessor | Restricted stock units
Effect of dilutive securities
Share-based payment arrangements (in shares)	0

Net Income (Loss) Per Common _4

Net Income (Loss) Per Common Share - Narrative (Details) - $ / shares shares in Millions	3 Months Ended		7 Months Ended	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 11, 2018
Bond Hedge and Call Spread Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion price (in usd per share)	$ 37.3625			$ 37.3625
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1	1.1	1.1	1
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0.5
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	3.6	3.3		3.9
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	5.6	5.6	5.6	5.6
Call Spread Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Class of Warrant or Right, Outstanding					12.6

Operating Segments - Summarized

Operating Segments - Summarized Financial Information of Operating Segments (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Sep. 30, 2018
Segment Reporting Information
REVENUE		$ 717	$ 692	$ 1,512	$ 2,164
GROSS PROFIT		390	352	753	1,183
OPERATING EXPENSES
Selling, general and administrative		253	281	613	761
Research and development		49	51	110	154
Amortization of intangible assets		41	39	86	122
Asset Impairment Charges		659	0	0	659
Restructuring charges, net		1	30	80	12
TOTAL OPERATING EXPENSES		1,003	401	889	1,708
OPERATING (LOSS) INCOME		(613)	(49)	(136)	(525)
INTEREST EXPENSE, OTHER INCOME (EXPENSE), NET AND REORGANIZATION ITEMS, NET		(47)	(19)	(80)	(142)
(LOSS) INCOME BEFORE INCOME TAXES		(660)	(68)	(216)	(667)
Total Assets		6,991			6,991	$ 7,679
Products & Solutions
Segment Reporting Information
REVENUE		298			913
Services
Segment Reporting Information
REVENUE		422			1,269
Operating Segments | Products & Solutions
Segment Reporting Information
REVENUE		298	322	716	913
GROSS PROFIT		189	210	473	587
Operating Segments | Services
Segment Reporting Information
REVENUE		422	433	967	1,269
GROSS PROFIT		249	257	582	759
Unallocated
Segment Reporting Information
REVENUE		(3)	(63)	(171)	(18)
GROSS PROFIT		$ (48)	$ (115)	$ (302)	$ (163)
Predecessor
Segment Reporting Information
REVENUE	$ 604
GROSS PROFIT	362
OPERATING EXPENSES
Selling, general and administrative	264
Research and development	38
Amortization of intangible assets	10
Asset Impairment Charges	0
Restructuring charges, net	14
TOTAL OPERATING EXPENSES	326
OPERATING (LOSS) INCOME	36
INTEREST EXPENSE, OTHER INCOME (EXPENSE), NET AND REORGANIZATION ITEMS, NET	3,400
(LOSS) INCOME BEFORE INCOME TAXES	3,436
Predecessor | Operating Segments | Products & Solutions
Segment Reporting Information
REVENUE	253
GROSS PROFIT	169
Predecessor | Operating Segments | Services
Segment Reporting Information
REVENUE	351
GROSS PROFIT	196
Predecessor | Unallocated
Segment Reporting Information
REVENUE	0
GROSS PROFIT	$ (3)

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive (Loss) Income - Components (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Dec. 15, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		$ 2,135		$ 1,668	$ 2,051
Other comprehensive income (loss) before reclassifications		(49)	$ (21)	(46)	(77)
Amounts reclassified to earnings		2	2	2	7
(Provision for) benefit from income taxes		(9)	(3)	(3)	(20)
Ending Balance	$ 1,668	1,470	1,718	1,718	1,470
Change in Unamortized Pension, Post-retirement and Postemployment Benefit-related Items
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		51	0	0	51
Other comprehensive income (loss) before reclassifications		(8)	0	0	(8)
Amounts reclassified to earnings		0	0	0	0
(Provision for) benefit from income taxes		(2)	0	0	(2)
Ending Balance	0	45	0	0	45
Foreign Currency Translation
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		(12)	(25)	0	(31)
Other comprehensive income (loss) before reclassifications		(10)	(4)	(29)	9
Amounts reclassified to earnings		0	0	0	0
(Provision for) benefit from income taxes		0	0	0	0
Ending Balance	0	(22)	(29)	(29)	(22)
Unrealized Loss on Term Loan Interest Rate Swap
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		(33)	0	0	(2)
Other comprehensive income (loss) before reclassifications		(31)	(17)	(17)	(78)
Amounts reclassified to earnings		2	2	2	7
(Provision for) benefit from income taxes		(7)	(3)	(3)	(18)
Ending Balance	0	(55)	(12)	(12)	(55)
Other
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		0	0	0	0
Other comprehensive income (loss) before reclassifications		0	0	0	0
Amounts reclassified to earnings		0	0	0	0
(Provision for) benefit from income taxes		0	0	0	0
Ending Balance	0	0	0	0	0
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		6	(25)	0	18
Ending Balance	0	$ (32)	$ (41)	(41)	$ (32)
Predecessor
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(5,013)			1,668
Other comprehensive income (loss) before reclassifications	(21)
Amounts reclassified to earnings	16
Pension settlement	721
(Provision for) benefit from income taxes	(58)
Ending Balance	1,668
Predecessor | Eliminations
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance				790
Ending Balance	790
Predecessor | Change in Unamortized Pension, Post-retirement and Postemployment Benefit-related Items
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(1,375)			0
Other comprehensive income (loss) before reclassifications	(24)
Amounts reclassified to earnings	16
Pension settlement	721
(Provision for) benefit from income taxes	(58)
Ending Balance	0
Stockholders' Equity Attributable to Parent, Before Elimination Of Predecessor Company Accumulated Other Comprehensive Loss	(720)
Predecessor | Change in Unamortized Pension, Post-retirement and Postemployment Benefit-related Items | Eliminations
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance				720
Ending Balance	720
Predecessor | Foreign Currency Translation
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(72)			0
Other comprehensive income (loss) before reclassifications	3
Amounts reclassified to earnings	0
(Provision for) benefit from income taxes	0
Ending Balance	0
Stockholders' Equity Attributable to Parent, Before Elimination Of Predecessor Company Accumulated Other Comprehensive Loss	(69)
Predecessor | Foreign Currency Translation | Eliminations
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance				69
Ending Balance	69
Predecessor | Unrealized Loss on Term Loan Interest Rate Swap
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	0			0
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified to earnings	0
(Provision for) benefit from income taxes	0
Ending Balance	0
Stockholders' Equity Attributable to Parent, Before Elimination Of Predecessor Company Accumulated Other Comprehensive Loss	0
Predecessor | Unrealized Loss on Term Loan Interest Rate Swap | Eliminations
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance				0
Ending Balance	0
Predecessor | Other
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(1)			0
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified to earnings	0
(Provision for) benefit from income taxes	0
Ending Balance	0
Stockholders' Equity Attributable to Parent, Before Elimination Of Predecessor Company Accumulated Other Comprehensive Loss	(1)
Predecessor | Other | Eliminations
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance				1
Ending Balance	1
Predecessor | Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(1,448)			$ 0
Ending Balance	0
Stockholders' Equity Attributable to Parent, Before Elimination Of Predecessor Company Accumulated Other Comprehensive Loss	$ (790)

Related Party Transactions (Det

Related Party Transactions (Details) $ in Millions	2 Months Ended	7 Months Ended	9 Months Ended
	Dec. 15, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)director	Sep. 30, 2018USD ($)
Related Party Transaction [Line Items]
Number of directors | director			7
Flex Ltd | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable, related parties			$ 18	$ 4
Flex Ltd | Purchased Goods And Services From Flex Ltd. | Board of Directors Chairman
Related Party Transaction [Line Items]
Cost of goods and services sold		$ 13	$ 22
Flex Ltd | Predecessor | Purchased Goods And Services From Flex Ltd. | Board of Directors Chairman
Related Party Transaction [Line Items]
Cost of goods and services sold	$ 6
Non-Employee Director
Related Party Transaction [Line Items]
Number of directors | director			6

Commitments and Contingencies -

Commitments and Contingencies - General (Details) $ in Millions	2 Months Ended
	Dec. 15, 2017USD ($)
Predecessor
Loss Contingencies [Line Items]
Legal costs	$ 37

Commitments and Contingencies_2

Commitments and Contingencies - Intellectual Property and Commercial Disputes (Details) $ in Thousands	Jun. 12, 2018USD ($)
Misappropriations Claim
Loss Contingencies [Line Items]
Estimated litigation liability	$ 1,210
Fraud Claim
Loss Contingencies [Line Items]
Estimated litigation liability	$ 0

Commitments and Contingencies_3

Commitments and Contingencies - Product Warranties (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Product warranties, maximum term	2 years
Amount reserved for product warranties	$ 1	$ 2

Commitments and Contingencies_4

Commitments and Contingencies - Letters of Credit and Guarantees (Details) $ in Millions	Jun. 30, 2019USD ($)
Line of Credit Facility [Line Items]
Restricted cash	$ 4
Standby Letters of Credit
Line of Credit Facility [Line Items]
Letters of credit, maximum amount	$ 70

Commitments and Contingencies_5

Commitments and Contingencies - Transactions with Nokia (Details) $ in Millions	9 Months Ended
	Jun. 30, 2019USD ($)
Indemnification Agreement
Loss Contingencies [Line Items]
Threshold amount of contribution and distribution agreement	$ 50