Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2015	Jul. 25, 2014
Other Comprehensive Income (Loss), Tax
Unrealized gain/(loss) on investments, tax expense/(benefit)	$ (74)	$ 32
Net change in retirement obligations, tax expense/(benefit)	10	6
Unrealized gain/(loss) on derivatives, tax expense/(benefit)	$ (20)	$ 21