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Additional Financial Information - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Nov. 09, 2023 $ / shares
Dividends Payable [Line Items] |  |  |  |  |  |
Interest payments | $ 33 | $ 25 |  |  |  |
Income and withholding taxes paid | 39 | 45 |  |  |  |
Noncash acquisition activities | 18 |  |  |  |  |
Net loss (gain) on divestitures | $ 17 | 41 | $ 41 | $ 0 | $ 0 |
Debt instrument, covenant, total indebtedness to EBITDA ratio | 3.50 |  |  |  |  |
Dividends paid | $ 89 | $ 84 |  |  |  |
Dividends paid (in dollars per share) | $ / shares | $ 0.17 |  |  |  |  |
Common Stock |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Cash dividends declared (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.17

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