BORROWINGS - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023
BORROWINGS
Financing lease obligations	$ 278	$ 242
Total	3,260	3,238
Less: Unamortized discount	4	5
Less: Unamortized debt issuance costs	12	13
Less: Current maturities of long-term debt	121	110
Total	$ 3,123	3,111
Finance lease obligations, interest rate (as a percent)	5.03%
Unsecured floating-rate term loan
BORROWINGS
Long-term debt	$ 500	500
Debt instrument, weighted-average interest rate (as a percent)	6.55%
Unsecured floating-rate term loan | SOFR
BORROWINGS
Debt instrument, weighted-average interest rate (as a percent)	1.225%
Commercial loan agreement
BORROWINGS
Long-term debt	$ 82	96
Debt instrument, weighted-average interest rate (as a percent)	3.00%
Unsecured senior notes due 2026
BORROWINGS
Long-term debt	$ 700	700
Debt instrument, weighted-average interest rate (as a percent)	2.05%
Unsecured senior notes due 2028
BORROWINGS
Long-term debt	$ 500	500
Debt instrument, weighted-average interest rate (as a percent)	2.70%
Unsecured senior notes due 2031
BORROWINGS
Long-term debt	$ 650	650
Debt instrument, weighted-average interest rate (as a percent)	3.15%
Unsecured senior notes due 2041
BORROWINGS
Long-term debt	$ 550	$ 550
Debt instrument, weighted-average interest rate (as a percent)	4.10%