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Fair Value Measurements - Schedule of Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total | $ 50 | $ 50 | $ 3
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total | 39 | 39 | 0
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total | 28 | 28 | 9
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total | (17) | (17) | (6)
Other current liabilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contractual obligations | (4) | (4) | (2)
Other current liabilities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contractual obligations | 0 | 0 | 0
Other current liabilities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contractual obligations | 0 | 0 | 0
Other current liabilities | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contractual obligations | (4) | (4) | (2)
Other noncurrent assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity method investment | 54 | 54 | 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 | 54 | 54 | 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] |  |  |
Contractual obligations | (13) | (13) | (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 | (13) | (13) | (4)
Interest Rate Swap |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unrealized gain on equity investments | 7 | 19 |
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 | 39 | 39 |
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 | 39 | 39 |
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 | 0 | 0 |
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 | (26) | (26) | (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 | (26) | (26) | (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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