Restructuring - Narrative (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Oct. 01, 2017 USD ($)	Jul. 02, 2017 USD ($)	Apr. 02, 2017 USD ($)	Jan. 01, 2017 USD ($)	Oct. 02, 2016 USD ($)	Jul. 03, 2016 USD ($)	Apr. 03, 2016 USD ($)	Dec. 31, 2017 USD ($) Employee	Jan. 01, 2017 USD ($)	Jan. 03, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges									$ 309	$ 491	$ 509
Medical Devices
Restructuring Cost and Reserve [Line Items]
Restructuring related charge									760
Restructuring charges	$ 284	$ 187	$ 128	$ 161	$ 298	$ 109	$ 141	$ 137	850	$ 685	$ 590
Restructuring costs incurred since announced	2,000								$ 2,000
Number of positions eliminated | Employee									2,400
Medical Devices | Cost of products sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges									$ 88
Medical Devices | Other Income Expense Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges									363
Medical Devices | Severance
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring charges	400								400
Minimum | Medical Devices
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring charges	2,000								$ 2,000
Percent of workforce eliminated									4.00%
Maximum | Medical Devices
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring charges	$ 2,400								$ 2,400
Percent of workforce eliminated									6.00%
Medical Devices
Restructuring Cost and Reserve [Line Items]
Period of workforce reduction									15 months
Number of positions eliminated and receiving severance payments | Employee									1,700