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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | ---
Foreign currency exchange derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset | $ 9 | $ 8
Foreign currency exchange derivatives | Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset | 0 | 2
Foreign currency exchange derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability | 14 | 11
Foreign currency exchange derivatives | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability | 1 | 2
Cross-currency interest rate swaps | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Hedging assets, current | 20 |
Cross-currency interest rate swaps | Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Hedging assets, current |  | 13
Equity swaps | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability |  | 2
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset | 26 | 17
Derivative liability | 1,137 | 1,175
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Long-term debt |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, noncurrent | 1,123 | 1,162
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, current | 6 | 4
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, noncurrent | 0 | 0
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, current | 13 | 11
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, noncurrent | 1 | 2
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Cross-currency interest rate swaps | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Hedging assets, current | 20 | 0
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Cross-currency interest rate swaps | Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Hedging assets, noncurrent | 0 | 13
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Equity swaps | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, noncurrent | 0 | 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset | 3 | 6
Derivative liability | 1 | 2
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Long-term debt |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, noncurrent | 0 | 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, current | 3 | 4
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, noncurrent | 0 | 2
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, current | 1 | 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, noncurrent | 0 | 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Cross-currency interest rate swaps | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Hedging assets, current | 0 | 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Cross-currency interest rate swaps | Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Hedging assets, noncurrent | 0 | 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Equity swaps | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, noncurrent | $ 0 | $ 2

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