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Fair Value Measurements | 6 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements ASC 820, "Fair Value Measurement," defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 also establishes a three-level fair value hierarchy that prioritizes information used in developing assumptions when pricing an asset or liability as follows: Level 1: Observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2: Quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Level 3: Unobservable inputs where there is little or no market data, which requires the reporting entity to develop its own assumptions. ASC 820 requires the use of observable market data, when available, in making fair value measurements. When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement. Recurring Fair Value Measurements The following tables present the Company’s fair value hierarchy for those assets and liabilities measured at fair value as of March 31, 2018 and September 30, 2017 (in millions):
| Fair Value Measurements Using:
| Total as of March 31, 2018 |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Other current assets |  |  |  |  |  |  |
Foreign currency exchange derivatives | $ | 26 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |
Commodity derivatives | 3 |  |  | — |  |  | 3 |  |  | — |
Exchange traded funds (fixed income)1 | 29 |  |  | 29 |  |  | — |  |  | — |
Other noncurrent assets |  |  |  |  |  |  |
Investments in marketable common stock | 7 |  |  | 7 |  |  | — |  |  | — |
Deferred compensation plan assets | 95 |  |  | 95 |  |  | — |  |  | — |
Exchange traded funds (fixed income)1 | 137 |  |  | 137 |  |  | — |  |  | — |
Exchange traded funds (equity)1 | 108 |  |  | 108 |  |  | — |  |  | — |
Equity swap | 63 |  |  | — |  |  | 63 |  |  | — |
Total assets | $ | 468 |  |  | $ | 376 |  |  | $ | 92 |  |  | $ | — |
Other current liabilities |  |  |  |  |  |  |
Foreign currency exchange derivatives | $ | 37 |  |  | $ | — |  |  | $ | 37 |  |  | $ | — |
Commodity derivatives | 2 |  |  | — |  |  | 2 |  |  | — |
Total liabilities | $ | 39 |  |  | $ | — |  |  | $ | 39 |  |  | $ | — |
| Fair Value Measurements Using:
| Total as of September 30, 2017 |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Other current assets |  |  |  |  |  |  |
Foreign currency exchange derivatives | $ | 27 |  |  | $ | — |  |  | $ | 27 |  |  | $ | — |
Commodity derivatives | 9 |  |  | — |  |  | 9 |  |  | — |
Exchange traded funds (fixed income)1 | 14 |  |  | 14 |  |  | — |  |  | — |
Other noncurrent assets |  |  |  |  |  |  |
Investments in marketable common stock | 10 |  |  | 10 |  |  | — |  |  | — |
Deferred compensation plan assets | 92 |  |  | 92 |  |  | — |  |  | — |
Exchange traded funds (fixed income)1 | 155 |  |  | 155 |  |  | — |  |  | — |
Exchange traded funds (equity)1 | 100 |  |  | 100 |  |  | — |  |  | — |
Equity swap | 55 |  |  | — |  |  | 55 |  |  | — |
Total assets | $ | 462 |  |  | $ | 371 |  |  | $ | 91 |  |  | $ | — |
Other current liabilities |  |  |  |  |  |  |
Foreign currency exchange derivatives | $ | 46 |  |  | $ | — |  |  | $ | 46 |  |  | $ | — |
Commodity derivatives | 1 |  |  | — |  |  | 1 |  |  | — |
Total liabilities | $ | 47 |  |  | $ | — |  |  | $ | 47 |  |  | $ | — |
1 Classified as restricted investments for payment of asbestos liabilities. See Note 21, "Commitments and Contingencies," of the notes to consolidated financial statements for further details. Valuation Methods Foreign currency exchange derivatives: The foreign currency exchange derivatives are valued under a market approach using publicized spot and forward prices. Commodity derivatives: The commodity derivatives are valued under a market approach using publicized prices, where available, or dealer quotes. Equity swaps: The equity swaps are valued under a market approach as the fair value of the swaps is equal to the Company’s stock price at the reporting period date. Deferred compensation plan assets: Assets held in the deferred compensation plans will be used to pay benefits under certain of the Company's non-qualified deferred compensation plans. The investments primarily consist of mutual funds which are publicly traded on stock exchanges and are valued using a market approach based on the quoted market prices. Investments in marketable common stock and exchange traded funds: Investments in marketable common stock and exchange traded funds are valued using a market approach based on the quoted market prices, where available, or broker/dealer quotes of identical or comparable instruments. The Company recorded unrealized gains of $15 million and unrealized losses of $13 million on these investments as of March 31, 2018 within AOCI in the consolidated statements of financial position. The Company recorded unrealized gains of $10 million and unrealized losses of $6 million on these investments as of September 30, 2017 within AOCI in the consolidated statements of financial position. The fair values of cash and cash equivalents, accounts receivable, short-term debt and accounts payable approximate their carrying values. The fair value of long-term debt was $11.2 billion and $12.7 billion at March 31, 2018 and September 30, 2017, respectively. The fair value of public debt was $9.1 billion and $8.6 billion, at March 31, 2018 and September 30, 2017, respectively, which was determined primarily using market quotes classified as Level 1 inputs within the ASC 820 fair value hierarchy. The fair value of other long-term debt was $2.1 billion and $4.1 billion at March 31, 2018 and September 30, 2017, respectively, which was determined based on quoted market prices for similar instruments classified as Level 2 inputs within the ASC 820 fair value hierarchy.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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