Receivables - Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 74
Provision for losses on accounts receivable	52	$ 0
Other adjustments to allowance and write-off's	69
Ending balance	199
Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 4