Restructuring Activities - Schedule of Restructuring Activities (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended	18 Months Ended
Dec. 31, 2024	Mar. 31, 2024	Sep. 30, 2024
Restructuring Reserve [Roll Forward]
RestructuringAndRelatedCostIncurredCost	$ 58	$ 61
Charges settled in cash	(22)	(22)
Impairment and other charges	(60)	(15)
Restructuring reserve	0	24
RestructuringAndRelatedCostIncurredCost	58	61
Licensor Commitments
Restructuring Reserve [Roll Forward]
RestructuringAndRelatedCostIncurredCost	5	30
Charges settled in cash	0	(17)
Impairment and other charges	(5)	(13)
Restructuring reserve	0	0
RestructuringAndRelatedCostIncurredCost	5	30
Workforce
Restructuring Reserve [Roll Forward]
RestructuringAndRelatedCostIncurredCost	(2)	29
Charges settled in cash	(22)	(5)
Impairment and other charges	0	0
Restructuring reserve	0	24
RestructuringAndRelatedCostIncurredCost	(2)	29
Office Space Reductions
Restructuring Reserve [Roll Forward]
RestructuringAndRelatedCostIncurredCost	55	2	$ 57
Charges settled in cash	0	0
Impairment and other charges	(55)	(2)
Restructuring reserve	0	0
RestructuringAndRelatedCostIncurredCost	55	$ 2	$ 57
Office Space Reductions \| General and administrative
Restructuring Reserve [Roll Forward]
RestructuringAndRelatedCostIncurredCost	6
RestructuringAndRelatedCostIncurredCost	6
Office Space Reductions \| Restructuring Charges
Restructuring Reserve [Roll Forward]
RestructuringAndRelatedCostIncurredCost	51
RestructuringAndRelatedCostIncurredCost	$ 51

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-17

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- Definition

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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Amount of decrease in the reserve for full or partial settlement through consideration other than cash.

+ References

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