Revenues from Contracts with Customers - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segments	Dec. 31, 2018 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Number of Reportable Segments | segments			2
Total revenue	$ 8,080	$ 8,601	$ 24,017	$ 25,159
Revenue, Remaining Performance Obligation, Amount	9,246		9,246
Equipment sales
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,372	$ 1,589	$ 3,784	$ 4,180
Scenario, Forecast
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount					$ 74	$ 2,000	$ 893