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Segment Information - Schedule of Components of Adjusted OIBDA to Operating Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting [Abstract] |  |  |  |
Operating income | $ 168 | $ 119 | $ 382 | $ 473
Amortization expense | 62 | 57 | 119 | 112
Depreciation expense | 28 | 26 | 57 | 52
Restructuring and impairments | 13 | 95 | 40 | 95
Transformation initiative costs | 18 | 19 | 35 | 38
Net gain on divestitures | 0 | (14) | 0 | (31)
Non-cash stock-based compensation and other related costs | 14 | 10 | 33 | 24
Adjusted OIBDA | $ 303 | $ 312 | $ 666 | $ 763

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