Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating lease expense
Operating lease cost	$ 106	$ 130
Short-term lease cost	8	11
Variable lease cost	22	18
Sublease income	(4)	(9)
Total operating costs	132	150
Finance lease expense
Amortization of right-of-use assets	61	87
Interest on lease liabilities	5	9
Total finance lease cost	$ 66	$ 96