Segment Information - Schedule of Reconciliation of Reportable Segment Profit to Consolidated Total (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Not allocated to segments:
Restructuring costs	$ 2	$ 2	$ 4	$ 2
Separation, transaction and integration-related costs	20	21	39	65
Interest expense, net	36	37	71	47
Income before taxes	37	36	79	77
Operating segments
Segment Reporting Information [Line Items]
Total segment profit	153	128	304	225
Not allocated to segments:
Amortization of acquired intangible assets	90	74	191	138
Corporate
Not allocated to segments:
Stock-based compensation	(10)	(1)	(15)	(3)
Amortization of acquired intangible assets	(50)	(36)	(98)	(61)
Restructuring costs	(2)	0	(4)	0
Separation, transaction and integration-related costs	(20)	(21)	(39)	(65)
Interest expense, net	(36)	(37)	(71)	(47)
Other unallocated, net	$ 2	$ 3	$ 2	$ 28