Segment Information (Net Revenue By Geographic Area) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from External Customer [Line Items]
Net revenue	$ 1,826	$ 1,151	$ 3,377	$ 2,610
North America
Revenue from External Customer [Line Items]
Net revenue	778	578	1,460	1,205
International
Revenue from External Customer [Line Items]
Net revenue	$ 1,048	$ 573	$ 1,917	$ 1,405