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Fair Value Measurements (Tables)
6 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Schedule of Carrying Value and Estimated Fair Value of Long-Term Debt
The Company’s long-term debt is recorded at amortized cost. The carrying value and fair value of the Company’s long-term debt was as follows:
September 30, 2025March 31, 2025
(In millions)Carrying ValueFair ValueCarrying ValueFair Value
Long-term debt, including current maturities$7,758 $7,831 $5,654 $5,598