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Fair Value Measurements (Tables)
6 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements
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, 2021March 31, 2021
(In millions)Carrying ValueFair ValueCarrying ValueFair Value
Long-term debt, including current maturities$5,985 $6,496 $7,148 $7,785