Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 29, 2016	Jan. 23, 2015	Jan. 29, 2016	Jan. 23, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 1,095	$ 977	$ 2,435	$ 2,676
Other comprehensive (loss) income, net of tax:
Unrealized loss on available-for-sale securities, net of tax benefit of $(34), $(20), $(149), and $(7), respectively	(61)	(37)	(268)	(17)
Translation adjustment	(1,454)	(203)	(1,513)	(332)
Net change in retirement obligations, net of tax expense of $10, $6, $30, and $18, respectively	27	21	62	63
Unrealized (loss) gain on derivatives, net of tax (benefit) expense of $(3), $36, $(36), and $125, respectively	(6)	64	(62)	222
Other comprehensive loss	(1,494)	(155)	(1,781)	(64)
Comprehensive (loss) income	$ (399)	$ 822	$ 654	$ 2,612