Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Apr. 24, 2015	Jan. 23, 2015	Oct. 24, 2014	Jul. 25, 2014	Apr. 25, 2014	Jan. 24, 2014	Oct. 25, 2013	Jul. 26, 2013	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ (1)	$ 977	$ 828	$ 871	$ 448	$ 762	$ 902	$ 953	$ 2,675	$ 3,065	$ 3,467
Unrealized gain (loss) on available-for-sale securities, net of tax expense (benefit) of $11, $(58), and $(19), respectively									20	(103)	(33)
Translation adjustment									(495)	13	(21)
Net change in retirement obligations, net of tax (benefit) expense of $(173), $72, and $(4), respectively									(366)	87	(18)
Unrealized gain (loss) on derivatives, net of tax expense (benefit) of $146, $(60), and $30, respectively									254	(102)	53
Other comprehensive loss									(587)	(105)	(19)
Comprehensive income									$ 2,088	$ 2,960	$ 3,448