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Fair Value Measurements - Schedule of Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total $ 53 $ 53 $ 3
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total 0 0 0
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total 69 69 9
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total (16) (16) (6)
Other current assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency forward exchange contracts 1 1 0
Other current assets | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency forward exchange contracts 0 0  
Other current assets | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency forward exchange contracts 1 1  
Other current assets | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency forward exchange contracts 0 0  
Other current liabilities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency forward exchange contract (1) (1) 0
Contractual obligations (4) (4) (2)
Other current liabilities | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency forward exchange contract 0 0  
Contractual obligations 0 0 0
Other current liabilities | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency forward exchange contract (1) (1)  
Contractual obligations 0 0 0
Other current liabilities | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency forward exchange contract 0 0  
Contractual obligations (4) (4) (2)
Other noncurrent assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency forward exchange contracts 0 0 0
Equity method investment 67 67 47
Other noncurrent assets | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity method investment 0 0 0
Other noncurrent assets | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity method investment 67 67 47
Other noncurrent assets | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity method investment 0 0 0
Other noncurrent liabilities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency forward exchange contract (30) (30) (38)
Contractual obligations (12) (12) (4)
Other noncurrent liabilities | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contractual obligations 0 0 0
Other noncurrent liabilities | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contractual obligations 0 0 0
Other noncurrent liabilities | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contractual obligations (12) (12) (4)
Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unrealized gain on equity investments 12 12  
Interest Rate Swap | Other noncurrent assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity investment with readily determinable fair value 32 32  
Interest Rate Swap | Other noncurrent assets | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity investment with readily determinable fair value 0 0  
Interest Rate Swap | Other noncurrent assets | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity investment with readily determinable fair value 32 32  
Interest Rate Swap | Other noncurrent assets | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity investment with readily determinable fair value 0 0  
Interest Rate Swap | Other noncurrent liabilities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swaps (30) (30) (38)
Interest Rate Swap | Other noncurrent liabilities | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swaps 0 0 0
Interest Rate Swap | Other noncurrent liabilities | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swaps (30) (30) (38)
Interest Rate Swap | Other noncurrent liabilities | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swaps $ 0 $ 0 $ 0