Segment Information (Net Revenue By Timing Recognition) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Revenue Reconciling Item
Net revenue	$ 1,826	$ 1,151	$ 3,377	$ 2,610
Recognized at a point in time
Segment Reporting, Revenue Reconciling Item
Net revenue	770	337	1,175	779
Recognized over time
Segment Reporting, Revenue Reconciling Item
Net revenue	$ 1,056	$ 814	$ 2,202	$ 1,831