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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |
Refund liabilities | $ 21 |  | $ 19
Uncollectible accounts, reserves | 19 |  | $ 19
Deferred revenue increased related to cash received from customers | 225 |  |
Revenue recognized related to deferred revenue | 248 |  |
Revenue recognized from performance obligations satisfied in previous periods | $ 41 | $ 43 |

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