Commitments and Contingencies (Details) $ in Millions					1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 05, 2020 claim	Nov. 28, 2018 USD ($)	Dec. 14, 2011 patent	Jun. 29, 2007	May 31, 2017 claim	Jan. 24, 2020 USD ($) claim	Jan. 25, 2019 USD ($)	Jan. 24, 2020 USD ($) manufacturer subsidiary claim landfill	Jan. 25, 2019 USD ($)	Apr. 29, 2016 USD ($) claim	Apr. 26, 2019 USD ($)
Loss Contingencies [Line Items]
Certain litigation charges						$ 108	$ 63	$ 276	$ 166
Accrued litigation charges						$ 600		$ 600			$ 500
Covidien
Loss Contingencies [Line Items]
Tax sharing percentage, parent				42.00%
Tax sharing percentage, former parent				27.00%
Tax sharing percentage, former affiliate				31.00%
Orrington, Maine chemical manufacturing facility
Loss Contingencies [Line Items]
Number of landfills requiring removal | landfill								2
Number of landfills requiring capping and installation of groundwater extraction systems | landfill								3
Pelvic mesh | Product liability litigation
Loss Contingencies [Line Items]
Number of subsidiaries | subsidiary								2
Number of manufacturers | manufacturer								1
Amount of settlement received										$ 121
Number of claims settled | claim					5,000					11,000
Number of pending claims | claim						16,000		16,000
Pelvic mesh | Product liability litigation | Subsequent Event
Loss Contingencies [Line Items]
Number of claims settled | claim	15,400
Ethicon
Loss Contingencies [Line Items]
Patents infringed | patent			1
Patents not infringed upon | patent			6
Sasso
Loss Contingencies [Line Items]
Approximate amount of verdict returned against the Company		$ 112