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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

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