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Segment Information - Schedule of Segment Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]        
Revenue $ 1,250 $ 1,071 $ 2,585 $ 2,327
Operating income (loss) 151 (49) 347 116
Amortization of intangible assets 58 47 110 94
Depreciation of property, plant and equipment 19 14 38 38
OIBDA 228 12 495 248
Recorded Music        
Segment Reporting Information [Line Items]        
Revenue 1,059 907 2,220 1,991
Music Publishing        
Segment Reporting Information [Line Items]        
Revenue 192 166 367 339
Operating Segments | Recorded Music        
Segment Reporting Information [Line Items]        
Revenue 1,059 907 2,220 1,991
Operating income (loss) 184 36 407 227
Amortization of intangible assets 38 30 71 59
Depreciation of property, plant and equipment 13 10 26 31
OIBDA 235 76 504 317
Operating Segments | Music Publishing        
Segment Reporting Information [Line Items]        
Revenue 192 166 367 339
Operating income (loss) 22 30 40 44
Amortization of intangible assets 20 17 39 35
Depreciation of property, plant and equipment 1 1 3 2
OIBDA 43 48 82 81
Corporate expenses and eliminations        
Segment Reporting Information [Line Items]        
Revenue (1) (2) (2) (3)
Operating income (loss) (55) (115) (100) (155)
Amortization of intangible assets 0 0 0 0
Depreciation of property, plant and equipment 5 3 9 5
OIBDA $ (50) $ (112) $ (91) $ (150)