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Additional Financial Information - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) $ / shares | Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) $ / shares | Mar. 31, 2021 USD ($) | Feb. 08, 2022 $ / shares
Dividends Payable [Line Items] |  |  |  |  |
Interest payments | $ 44 | $ 37 | $ 57 | $ 64 |
Income and withholding taxes paid | 37 | $ 35 | 66 | 52 |
Dividends paid | $ 78 |  | $ 156 | $ 125 |
Dividends paid (in dollars per share) | $ / shares | $ 0.15 |  | $ 0.30 |  |
Noncash investing activities related to acquisition of music publishing rights and music catalogs | $ 125 |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Debt instrument, covenant, total indebtedness to EBITDA ratio | 3.50 |  | 3.50 |  |
Common Stock |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends declared (in dollars per share) | $ / shares |  |  |  |  | $ 0.15

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