Recent Accounting Standards (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017	Mar. 31, 2018	Mar. 30, 2018	[1]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	$ 1,175	$ 1,240	$ 2,331	$ 2,415
Operating expenses	817	$ 987	1,722	$ 1,949
Retained earnings	1,100		1,100		$ 1,267	$ 328
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings					197
Accounting Standards Update 2016-16
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings					$ 742
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	4		9
Operating expenses	(2)		(11)
Retained earnings	217		217
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 883		$ 883

[1] Derived from audited financial statements.