Leases - Narrative (Details) $ in Millions	3 Months Ended			6 Months Ended
	Oct. 02, 2020 USD ($) facility	Jul. 03, 2020 facility	Sep. 30, 2019 USD ($)	Oct. 02, 2020 USD ($) facility	Sep. 30, 2019 USD ($)
Operating Leased Assets [Line Items]
Operating leases not yet commenced	$ 17			$ 17
Financing leases not yet commenced	$ 1			$ 1
Number of facilities no longer utilized | facility		20		24
Additional number of facilities no longer utilized | facility	4
Restructuring costs	$ 13		$ 2	$ 31	$ 4
ROU assets abandoned	21			21
Restructuring liability	$ 21			$ 21
Minimum
Operating Leased Assets [Line Items]
Term of contracts not yet commenced				3 years
Maximum
Operating Leased Assets [Line Items]
Term of contracts not yet commenced				8 years