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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Foreign currency exchange derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Total assets | $ 5 | $ 8
Foreign currency exchange derivatives | Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Total assets |  | 1
Foreign currency exchange derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Total liabilities | 34 | 12
Foreign currency exchange derivatives | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Total liabilities | 5 | 3
Cross-currency interest rate swaps | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Total assets |  | 12
Cross-currency interest rate swaps | Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Total assets |  | 1
Cross-currency interest rate swaps | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Total liabilities | 1 |
Interest rate cap | Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Total assets | 0 | 1
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 |  |
Derivatives, Fair Value [Line Items] |  |
Total assets | 5 | 19
Total liabilities | 1,213 | 1,109
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Long-term debt |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, noncurrent | 1,173 | 1,094
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Other current assets | 5 | 5
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] |  |
Other current liabilities | 34 | 12
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 | 5 | 3
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Cross-currency interest rate swaps | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Other current assets | 0 | 12
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 | 1
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Cross-currency interest rate swaps | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Other current liabilities | 1 | 0
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Interest rate cap | Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, noncurrent | 0 | 1
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 |  |
Derivatives, Fair Value [Line Items] |  |
Total assets | 0 | 4
Total liabilities | 0 | 0
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] |  |
Other current assets | 0 | 3
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 | 1
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Other current liabilities | 0 | 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] |  |
Other current assets | 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 | Cross-currency interest rate swaps | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Other current liabilities | 0 | 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Interest rate cap | Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, noncurrent | $ 0 | $ 0

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