Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 27, 2017	Oct. 28, 2016	Oct. 27, 2017	Oct. 28, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 2,013	$ 1,111	$ 3,022	$ 2,040
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities	25	(40)	55	75
Translation adjustment	(203)	(336)	628	(686)
Net change in retirement obligations	15	19	14	44
Unrealized gain (loss) on derivatives	27	53	(144)	107
Other comprehensive (loss) income	(136)	(304)	553	(460)
Comprehensive income including noncontrolling interests	1,877	807	3,575	1,580
Comprehensive loss attributable to noncontrolling interests	4	4	11	4
Comprehensive income attributable to Medtronic	$ 1,881	$ 811	$ 3,586	$ 1,584