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Derivative Instruments and Hedging Activities Location and Fair Values of Derivative Instruments and Hedging Activities (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Derivative Instruments [Line Items] |  |  |
Derivative, amount of hedged ordinary shares | 1.8 | 1.4 |
Gross amount recognized, derivative assets | $ 80 | $ 91 |
Gross amount, derivative liabilities | 3,175 | 2,105 |
Equity swap |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative, Amount of Hedged Item | 73 | 58 |
Designated as Hedging Instrument |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 7 | 36 |
Gross amount, derivative liabilities | 3,173 | 2,080 |
Designated as Hedging Instrument | Other current assets | Foreign currency exchange derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 6 | 27 |
Designated as Hedging Instrument | Other current assets | Commodity derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 1 | 9 |
Designated as Hedging Instrument | Other noncurrent assets | Equity swap |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 0 | 0 |
Designated as Hedging Instrument | Other current liabilities | Foreign currency exchange derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 10 | 21 |
Designated as Hedging Instrument | Other current liabilities | Commodity derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 14 | 1 |
Designated as Hedging Instrument | Long-term debt | Foreign Currency Denominated Debt [Member] |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 3,149 | 2,058 |
Not Designated as Hedging Instrument |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 73 | 55 |
Gross amount, derivative liabilities | 2 | 25 |
Not Designated as Hedging Instrument | Other current assets | Foreign currency exchange derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 10 | 0 |
Not Designated as Hedging Instrument | Other current assets | Commodity derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 0 | 0 |
Not Designated as Hedging Instrument | Other noncurrent assets | Equity swap |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 63 | 55 |
Not Designated as Hedging Instrument | Other current liabilities | Foreign currency exchange derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 2 | 25 |
Not Designated as Hedging Instrument | Other current liabilities | Commodity derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 0 | 0 |
Not Designated as Hedging Instrument | Long-term debt | Foreign Currency Denominated Debt [Member] |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 0 | 0 |
Cash Flow Hedging |  |  |
Derivative Instruments [Line Items] |  |  |
Amount of Gain (Loss) Reclassified from AOCI into Income | 16 | 33 | $ (32)
Net financing charges | Cash Flow Hedging | Forward Treasury Locks |  |  |
Derivative Instruments [Line Items] |  |  |
Amount of Gain (Loss) Reclassified from AOCI into Income | $ 0 | $ 0 | $ 1

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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