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Segment Information - Schedule of Components of Adjusted OIBDA to Operating Income (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting [Abstract]
Operating income	$ 354	$ 265	$ 790	$ 714	$ 609
Amortization expense	55	63	245	263	229
Depreciation expense	26	21	87	76	77
Restructuring	19	12	42	8	18
Transformation initiatives and other related costs			53	46	36
Executive transition costs			7	0	0
Net loss (gain) on divestitures	(17)	(41)	(41)	0	0
COVID-19 related costs			0	0	1
Non-cash stock-based compensation and other related costs	14	15	52	42	48
Adjusted OIBDA	$ 451	$ 335	$ 1,235	$ 1,149	$ 1,018

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