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Additional Financial Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) $ / shares | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) $ / shares | Mar. 31, 2023 USD ($) | Feb. 12, 2024 $ / shares
Dividends Payable [Line Items] |  |  |  |  |
Interest payments | $ 57 | $ 50 | $ 90 | $ 75 |
Income and withholding taxes paid | 33 | 72 | 72 | 117 |
Noncash acquisition activities |  |  | 18 |  |
Net loss (gain) on divestitures | $ 14 | $ 0 | $ 31 | 41 |
Debt instrument, covenant, total indebtedness to EBITDA ratio | 3.50 |  | 3.50 |  |
Dividends paid | $ 89 |  | $ 178 | $ 167 |
Dividends paid (in dollars per share) | $ / shares | $ 0.17 |  | $ 0.34 |  |
Common Stock |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends declared (in dollars per share) | $ / shares |  |  |  |  | $ 0.17

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