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Financial Instruments (Schedule Of Amounts Included In Earnings And Other Comprehensive Income) (Details) lb in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2019 USD ($) lb | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Financial Instruments [Line Items] |  |  |
Notional value of foreign currency hedge positions | $ 2,300 |  |
Derivative, amount of commodities hedged | 117 |  |
Gain (Loss) to earnings | 68 | $ 0 | $ (44)
Gain (Loss) to other comprehensive income | (4) | 2 | 55
Foreign currency [Member] | Other deductions, net [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Gain (Loss) to earnings | $ 66 | (15) | (39)
Copper and aluminum [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Weight of copper and aluminum for commodity hedges, in pounds | lb | 48 |  |
Cash Flow Hedging [Member] | Commodity [Member] | Cost of sales [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Gain (Loss) to earnings | $ (11) | 13 | 10
Cash Flow Hedging [Member] | Foreign currency [Member] | Sales, cost of sales [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Gain (Loss) to earnings | 13 | 2 | (15)
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member] | Commodity [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Gain (Loss) to other comprehensive income | (10) | (7) | 25
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member] | Foreign currency [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Gain (Loss) to other comprehensive income | $ 6 | $ 9 | $ 30

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- Definition Financial Instruments [Line Items] + References No definition available. + Details
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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of hedged item in hedging relationship. Excludes hedged asset or liability. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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