Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Leases, Supplemental Cash Flow Information [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities – operating cash flows	$ 214	$ 254
ROU assets obtained in exchange for lease, net	117	69
Change in lease classification from operating to finance lease	521	509
Finance Leases, Supplemental Cash Flow Information [Abstract]
Interest paid for finance lease liabilities – Operating cash flows	9	16
Cash paid for amounts included in the measurement of finance lease obligations – financing cash flows	168	276
Total cash paid in the measurement of finance lease obligations	177	292
Capital expenditures through finance lease obligations	$ 44	$ 114