Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Statement of Other Comprehensive Income (Paranthetical) [Abstract]
Tax expense (benefit) on the unrealized gain/(loss) on investments	$ 11	$ (58)	$ (19)
Net change in retirement obligations	(173)	72	(4)
Tax expense (benefit) on the net unrealized gain (loss) on foreign exchange rate derivatives and interest rate derivative instruments	$ 146	$ (60)	$ 30