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Additional Financial Information - Narrative (Details) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Nov. 10, 2022 $ / shares | Aug. 13, 2021 $ / shares
Supplemental Cash Flow Information [Line Items] |  |  |  |  |
Interest payments | $ | $ 122 | $ 137 | $ 128 |  |
Foreign income and withholding taxes | $ | 141 | 124 | 81 |  |
Dividends paid | $ | 318 | $ 265 | $ 344 |  |
Noncash investing activities related to acquisition of music publishing rights and music catalogs | $ | $ 125 |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |  |
Debt instrument, covenant, total indebtedness to EBITDA ratio | 3.50 |  |  |  |
Common Class A |  |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |  |
Dividends payable, amount per share (in dollars per share) | $ / shares |  |  |  |  | $ 0.16
Common Class A | Subsequent Event |  |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |  |
Dividends payable, amount per share (in dollars per share) | $ / shares |  |  |  | $ 0.16 |
Common Class B |  |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |  |
Dividends payable, amount per share (in dollars per share) | $ / shares |  |  |  |  | $ 0.16
Common Class B | Subsequent Event |  |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |  |
Dividends payable, amount per share (in dollars per share) | $ / shares |  |  |  | $ 0.16 |

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