Fair Value Measurements - Narrative (Details) - USD ($)	Jun. 30, 2025	Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated amounts to be reclassified over 12 months	$ 1,000,000
Cash and cash equivalents, at fair value	711,000,000	$ 885,000,000
Term Loan \| Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated fair value of long-term debt	3,957,000,000	3,954,000,000
Recurring Fair Value Measurements \| Money Market Funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents, at fair value	227,000,000	802,000,000
Fair Value, Nonrecurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value	99,000,000	$ 85,000,000
Interest Rate Swap \| Cash Flow Hedging \| Designated as Hedging Instrument
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Notional amount	$ 350,000,000

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