Stockholders' Equity (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2017	[1]			$ 3,487
Other comprehensive loss		$ (3)	$ 2	(5)	$ (23)
September 29, 2017		3,535		3,535
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2017				7
Reclassification to net loss				(3)
Other comprehensive loss				(2)
September 29, 2017		2		2
Unrealized Gain on Available-For-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2017				5
Reclassification to net loss				0
Other comprehensive loss				0
September 29, 2017		5		5
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2017				12
Reclassification to net loss				(3)
Other comprehensive loss				(2)
September 29, 2017		$ 7		$ 7

[1] Derived from audited financial statements.