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Segment Information - Schedule of Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Revenue $ 6,707 $ 6,426 $ 6,037
Cost of revenue 3,632 3,355 3,177
Selling and marketing expense 642 685 710
Distribution expense 112 105 125
General and administrative expense 1,135 1,089 991
Restructuring & Impairment 234 177 40
Amortization expense 258 224 245
Net loss (gain) on divestitures 0 (32) (41)
Operating income (loss) 694 823 790
Total assets 9,829 9,155  
Capital expenditures 139 116 127
Depreciation expense 118 103 87
Operating Segments | Recorded Music      
Segment Reporting Information [Line Items]      
Revenue 5,408 5,223 4,955
Cost of revenue 2,818 2,599 2,502
Selling and marketing expense 615 663 695
Distribution expense 112 105 125
General and administrative expense 679 664 604
Restructuring & Impairment 198 166 40
Amortization expense 136 127 155
Net loss (gain) on divestitures   (17) (41)
Operating income (loss) 850 916 875
Total assets 5,328 4,945  
Capital expenditures 22 28 39
Depreciation expense 53 52 50
Operating Segments | Music Publishing      
Segment Reporting Information [Line Items]      
Revenue 1,306 1,210 1,088
Cost of revenue 821 763 681
Selling and marketing expense 3 2 3
Distribution expense 0 0 0
General and administrative expense 131 123 114
Restructuring & Impairment 5 0 0
Amortization expense 122 98 90
Net loss (gain) on divestitures   (14) 0
Operating income (loss) 224 238 200
Total assets 3,463 3,017  
Capital expenditures 3 1 1
Depreciation expense 5 4 3
Corporate expenses and eliminations      
Segment Reporting Information [Line Items]      
Revenue (7) (7) (6)
Cost of revenue (7) (7) (6)
Selling and marketing expense 24 20 12
Distribution expense 0 0 0
General and administrative expense 325 302 273
Restructuring & Impairment 31 11 0
Amortization expense 0 (1) 0
Net loss (gain) on divestitures   (1) 0
Operating income (loss) (380) (331) (285)
Total assets 1,038 1,193  
Capital expenditures 114 87 87
Depreciation expense $ 60 $ 47 $ 34