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Derivative Instruments and Hedging Activities Location and Fair Values of Derivative Instruments and Hedging Activities (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | $ 91,000,000 | $ 95,000,000 |
Gross amount, derivative liabilities | 2,105,000,000 | 2,980,000,000 |
Equity swap |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative, Amount of Hedged Item | 58,000,000 | 0 |
Designated as Hedging Instrument |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 36,000,000 | 46,000,000 |
Gross amount, derivative liabilities | 2,080,000,000 | 2,957,000,000 |
Designated as Hedging Instrument | Other current assets | Foreign currency exchange derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 27,000,000 | 41,000,000 |
Designated as Hedging Instrument | Other current assets | Commodity derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 9,000,000 | 4,000,000 |
Designated as Hedging Instrument | Other noncurrent assets | Interest rate swaps |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 0 | 1,000,000 |
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 | 21,000,000 | 48,000,000 |
Designated as Hedging Instrument | Other current liabilities | Commodity derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 1,000,000 | 0 |
Designated as Hedging Instrument | Liabilities held for sale [Domain] | Foreign currency exchange derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 0 | 0 |
Designated as Hedging Instrument | Current portion of long-term debt | Fixed rate debt swapped to floating |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 0 | 551,000,000 |
Designated as Hedging Instrument | Long-term debt | Fixed rate debt swapped to floating |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 0 | 301,000,000 |
Designated as Hedging Instrument | Long-term debt | Foreign Currency Denominated Debt [Member] |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 2,058,000,000 | 938,000,000 |
Designated as Hedging Instrument | Noncurrent liabilities held for sale [Domain] | Foreign currency exchange derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 0 | 1,119,000,000 |
Not Designated as Hedging Instrument |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 55,000,000 | 49,000,000 |
Gross amount, derivative liabilities | 25,000,000 | 23,000,000 |
Not Designated as Hedging Instrument | Other current assets | Foreign currency exchange derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount recognized, derivative assets | 0 | 49,000,000 |
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 | Interest rate swaps |  |  |
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 | 55,000,000 | 0 |
Not Designated as Hedging Instrument | Other current liabilities | Foreign currency exchange derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 25,000,000 | 18,000,000 |
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 | Liabilities held for sale [Domain] | Foreign currency exchange derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 0 | 5,000,000 |
Not Designated as Hedging Instrument | Current portion of long-term debt | Fixed rate debt swapped to floating |  |  |
Derivative Instruments [Line Items] |  |  |
Gross amount, derivative liabilities | 0 | 0 |
Not Designated as Hedging Instrument | Long-term debt | Fixed rate debt swapped to floating |  |  |
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 |
Not Designated as Hedging Instrument | Noncurrent liabilities held for sale [Domain] | Foreign currency exchange derivatives |  |  |
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 | 33,000,000 | (32,000,000) | $ (9,000,000)
Net financing charges | Cash Flow Hedging | Forward Treasury Locks |  |  |
Derivative Instruments [Line Items] |  |  |
Amount of Gain (Loss) Reclassified from AOCI into Income | $ 0 | $ 1,000,000 | $ 1,000,000

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