Restructuring - Narrative (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring And Related Cost, Expected Period Of Cash Outlays For Severance Paid									2 years
Restructuring charges	$ 251	$ 128	$ 142	$ 90	$ 227		$ 176		$ 266	$ 251	$ 309
Medical Devices
Restructuring Cost and Reserve [Line Items]
Restructuring charges						$ 190		$ 107	400
Supply Chain
Restructuring Cost and Reserve [Line Items]
Restructuring charges									611
Restructuring Reserve					242					242
Restructuring costs incurred since announced	800								800
Supply Chain | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									300
Supply Chain | Cost of products sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges									100
Supply Chain | Other Income Expense Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges									200
Supply Chain | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0
Restructuring Reserve					194					194
Supply Chain | Asset Write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring charges									151
Restructuring Reserve					0					0
Supply Chain | Other(2)
Restructuring Cost and Reserve [Line Items]
Restructuring charges									460
Restructuring Reserve					$ 48					$ 48
Supply Chain | Minimum
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring charges	1,900								1,900
Restructuring and Related Cost, Expected Future Savings	600								$ 600
Supply Chain | Minimum | Medical Devices
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Duration of Restructuring Plan									4 years
Supply Chain | Maximum
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring charges	2,300								$ 2,300
Restructuring and Related Cost, Expected Future Savings	$ 800								$ 800
Supply Chain | Maximum | Medical Devices
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Duration of Restructuring Plan									5 years
Medical Devices
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve											267
Medical Devices | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve											229
Medical Devices | Asset Write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve											0
Medical Devices | Other(2)
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve											$ 38