Derivative Instruments (Derivatives Not Designated For Hedge Accounting) (Details) - Derivatives not designated for hedge accounting - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 30, 2016	Jan. 01, 2016	Dec. 30, 2016	Jan. 01, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, pretax amounts affecting income	$ 2	$ (5)	$ (3)	$ (7)
Total return swaps | Cost of services and Selling, general & administrative expenses
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, pretax amounts affecting income	0	2	0	(1)
Foreign currency forwards | Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, pretax amounts affecting income	$ 2	$ (7)	$ (3)	$ (6)