Supplementary Information (Contract Liabilities) (Details) - USD ($) $ in Millions	Dec. 28, 2018	Mar. 31, 2018	Mar. 30, 2018
Supplementary Information [Abstract]
Deferred revenue	$ 1,738		$ 2,368
Customer deposit liabilities	476		0
Total short-term contract liabilities	$ 2,214	$ 2,261	$ 2,368	[1]

[1] Derived from audited financial statements.