Derivative Instruments (Nondesignated Hedging) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 01, 2016	Jan. 02, 2015	Jan. 01, 2016	Jan. 02, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, pretax amounts affecting income	$ (5)	$ 3	$ (7)	$ 2
Total return swaps | Cost of services and Selling, general & administrative expenses
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, pretax amounts affecting income	2	3	(1)	7
Foreign currency forwards and options | Other Income (Expense)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, pretax amounts affecting income	$ (7)	$ 0	$ (6)	$ (5)