Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 25, 2019	Jan. 26, 2018	Jan. 25, 2019	Jan. 26, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,271	$ (1,392)	$ 3,468	$ 1,630
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities	32	(14)	23	41
Currency translation	128	897	(1,127)	1,525
Net change in retirement obligations	17	(3)	65	11
Unrealized (loss) gain on derivatives	(23)	(202)	317	(346)
Other comprehensive income (loss)	154	678	(722)	1,231
Comprehensive income (loss) including noncontrolling interests	1,425	(714)	2,746	2,861
Comprehensive (income) loss attributable to noncontrolling interests	(2)	3	(6)	14
Comprehensive income (loss) attributable to Medtronic	$ 1,423	$ (711)	$ 2,740	$ 2,875