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Additional Financial Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Feb. 11, 2021
Dividends Payable [Line Items] |  |  |  |  |
Interest payments | $ 37 | $ 21 | $ 64 | $ 65 |
Income and withholding taxes paid | 35 | $ 20 | 52 | 40 |
Dividends paid | $ 63 |  | $ 125 | $ 244 |
Common Stock |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends declared (in dollars per share) |  |  |  |  | $ 0.12
Dividends paid (in dollars per share) | $ 0.12 |  | $ 0.24 |  |

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