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Additional Financial Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | May 13, 2021
Dividends Payable [Line Items] |  |  |  |  |
Interest payments | $ 28 | $ 43 | $ 92 | $ 108 |
Income and withholding taxes paid | 37 | $ 18 | 89 | 58 |
Dividends paid | $ 62 |  | $ 187 | $ 281 |
Dividends paid (in dollars per share) | $ 0.12 |  |  |  |
Common Stock |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends declared (in dollars per share) |  |  |  |  | $ 0.12
Dividends paid (in dollars per share) |  |  | $ 0.36 |  |

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