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Restructuring Activities - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended	18 Months Ended
	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 119
Restructuring reserve	0	$ 24	$ 0
Charges to operations	58	61
Office Space Reductions
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	0	0
Charges to operations	55	2	57
Workforce
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	24	0
Charges to operations	(2)	29
Licensor Commitments
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	0	0
Charges to operations	5	$ 30
Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	125		125
Minimum \| Office Space Reductions
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	50		50
Minimum \| Workforce
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	40		40
Minimum \| Licensor Commitments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	35		35
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	165		165
Maximum \| Office Space Reductions
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	65		65
Maximum \| Workforce
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	55		55
Maximum \| Licensor Commitments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 45		$ 45