Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

The Company’s long-term debt is also recorded at cost. The carrying value and fair value of the Company’s long-term debt was as follows:

	March 31, 2021				March 31, 2020
(In millions)	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt, including current maturities	$	7,148	$	7,785	$	7,387	$	7,792