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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