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Restructuring Activities - Narrative (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended	18 Months Ended
	Dec. 31, 2024	Mar. 31, 2024	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 119
Restructuring reserve	0	$ 24
Charges to operations	58	61
Office Space Reductions
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	0
Charges to operations	55	2	$ 57
Workforce
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	24
Charges to operations	(2)	29
Licensor Commitments
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	0
Charges to operations	5	$ 30
Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	125
Minimum \| Office Space Reductions
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	50
Minimum \| Workforce
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	40
Minimum \| Licensor Commitments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	35
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	165
Maximum \| Office Space Reductions
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	65
Maximum \| Workforce
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	55
Maximum \| Licensor Commitments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 45