Stockholders' Equity (Schedule of Accumulated Other Comprehensive Income) (Details) $ in Millions	9 Months Ended
	Dec. 29, 2017 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2017	$ 3,487	[1]
Other comprehensive income (loss)
December 29, 2017	4,958
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2017	7
Reclassification to net income	5
Other comprehensive income (loss)	4
December 29, 2017	16
Unrealized Gain (Loss) on Available-For-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2017	5
Reclassification to net income	(4)
Other comprehensive income (loss)	(2)
December 29, 2017	(1)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2017	12
Reclassification to net income	1
Other comprehensive income (loss)	2
December 29, 2017	$ 15

[1] Derived from audited financial statements.