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Equity - Narrative (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Non-cash stock-based compensation expense | $ 14 | $ 24
Share-based compensation liability | 10 |
Restricted Stock Units (RSUs) |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Non-cash stock-based compensation expense | 8 |
Additional Paid-in Capital |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Non-cash stock-based compensation expense | 4 |
Share-based compensation liability | $ 5 |
Common Stock | Class A Common Stock |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Shares issued under the Plan (in shares) | 869,000 |
Vesting of restricted stock units, net of shares withheld for employee taxes (in shares) | 5,000 |

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