Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Leases, Supplemental Cash Flow Information [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities – operating cash flows	$ 106	$ 130
ROU assets obtained in exchange for operating lease liabilities	55	52
Change in lease classification from operating to finance lease	338	242
Finance Leases, Supplemental Cash Flow Information [Abstract]
Interest paid for finance lease liabilities – Operating cash flows	5	9
Cash paid for amounts included in the measurement of finance lease obligations – financing cash flows	96	170
Total cash paid in the measurement of finance lease obligations	101	179
Capital expenditures through finance lease obligations	$ 26	$ 71