Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 25, 2014	Jul. 26, 2013
Other Comprehensive Income (Loss), Tax
Unrealized gain/(loss) on investments, tax expense/(benefit)	$ 32	$ (54)
Net change in retirement obligations, tax expense/(benefit)	6	9
Unrealized gain/(loss) on derivatives, tax expense/(benefit)	$ 21	$ 1