Segment Information (Net Revenue By Timing Recognition) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item
Net revenue	$ 1,551	$ 1,459
Recognized at a point in time
Segment Reporting, Revenue Reconciling Item
Net revenue	405	442
Recognized over time
Segment Reporting, Revenue Reconciling Item
Net revenue	$ 1,146	$ 1,017