Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 24, 2020	Jan. 25, 2019	Jan. 24, 2020	Jan. 25, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment	$ 0	$ 0	$ 0	$ 0
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible asset charges	0			87,000,000
Impairment of indefinite-lived intangible assets	0	21,000,000	0	21,000,000
Amortization expense	$ 436,000,000	436,000,000	1,317,000,000	1,327,000,000
Restorative Therapies Group
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible asset charges		26,000,000	$ 33,000,000	26,000,000
Impairment of indefinite-lived intangible assets		$ 11,000,000		11,000,000
Cardiac and Vascular Group
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible asset charges				$ 61,000,000