Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 23, 2015	Jan. 24, 2014	Jan. 23, 2015	Jan. 24, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 977	$ 762	$ 2,676	$ 2,617
Other comprehensive (loss) income, net of tax:
Unrealized loss on available-for-sale securities, net of tax benefit of $(20), $(34), $(7), and $(71), respectively	(37)	(63)	(17)	(127)
Translation adjustment	(203)	(50)	(332)	1
Net change in retirement obligations, net of tax expense of $6, $8, $18, and $25, respectively	21	14	63	43
Unrealized gain (loss) on derivatives, net of tax expense (benefit) of $36, $27, $125, and $(25), respectively	64	48	222	(43)
Other comprehensive (loss) income, net of tax	(155)	(51)	(64)	(126)
Comprehensive income	$ 822	$ 711	$ 2,612	$ 2,491