Restructuring Costs - Expense by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Apr. 01, 2016	Apr. 03, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 238	$ 23	$ 256
Operating segments | GBS
Restructuring Cost and Reserve [Line Items]
Restructuring costs	110	20	137
Operating segments | GIS
Restructuring Cost and Reserve [Line Items]
Restructuring costs	128	3	114
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0	$ 0	$ 5