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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Sep. 30, 2020
Level 2 measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of debt | $ 3,371 | $ 3,137
Level 3 | Acquisition-related Costs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Additions to net liabilities | $ 7 |

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