Sale of Receivables (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 02, 2020	Sep. 30, 2019	Oct. 02, 2020	Sep. 30, 2019	Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed and unbilled sold receivables	$ 922	$ 720	$ 1,810	$ 1,410
Collection of receivables sold			21		$ 63
Receivable transfers as sales outstanding	300		300		$ 255
Financial Institution
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collection of receivables sold	$ 887	$ 749	$ 1,760	$ 1,410