Pension and Other Benefit Plans (Net Periodic Benefit Pension Benefit) (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 30, 2016	Jan. 01, 2016	Dec. 30, 2016	Jan. 01, 2016
Components of net periodic benefit cost [Abstract]
Service cost	$ 6	$ 6	$ 17	$ 19
Interest cost	20	24	62	71
Expected return on assets	(40)	(46)	(123)	(137)
Amortization of prior service costs	(4)	(4)	(13)	(14)
Recognition of actuarial (gain) loss	0	(8)	0	(8)
Contractual termination benefit	0	7	0	7
Net periodic pension benefit	$ (18)	$ (21)	$ (57)	$ (62)