Segment Information (Reconciliation of Consolidated Operating Income to Income Before Taxes) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Dec. 30, 2016	Jan. 01, 2016		Dec. 30, 2016	Jan. 01, 2016
Reconciliation of consolidated operating income to income before taxes [Abstract]
Consolidated segment operating income	$ 165	$ 148		$ 315	$ 422
Corporate G&A	(92)	(60)		(237)	(181)
Pension & OPEB actuarial & settlement gains (losses)	0	19		(1)	19
Interest expense	(33)	(33)	[1]	(87)	(92)	[1]
Interest income	8	8	[1]	26	26	[1]
Other income (expense), net	2	(4)	[1]	(3)	3	[1]
Income from continuing operations, before taxes	$ 50	$ 78	[1]	$ 13	$ 197	[1]

[1] Certain prior year balances were adjusted for certain errors in previously issued financial statements related to income taxes and for the adoption of ASU 2016-09 related to employee stock-based compensation. See Note 20 - Reconciliation of Previously Reported Amounts.