Intangible Assets and Goodwill - Narrative (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Apr. 01, 2019	Dec. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 4,400				$ 4,400
Finite-Lived Intangible Assets, Amortization Expense, Year Two	4,400				4,400
Finite-Lived Intangible Assets, Amortization Expense, Year Three	4,400				4,400
Finite-Lived Intangible Assets, Amortization Expense, Year Four	4,400				4,400
Finite-Lived Intangible Assets, Amortization Expense, Year Five	4,400				4,400
Indefinite-lived Intangible Assets (Excluding Goodwill)	11,262				11,262			$ 9,190
Intangible Assets and Goodwill (Textuals)
Amortization expense of amortizable intangible assets	1,100			$ 1,100	2,200	$ 2,200
Goodwill	33,661				33,661			30,453
Patents And Trademarks
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	25,082				$ 25,082			25,410
Intangible Assets and Goodwill (Textuals)
Finite-Lived Intangible Assets, Weighted-Average Useful Life					12 years
Customer relationships and other intangible assets
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	12,988				$ 12,988			13,011
Intangible Assets and Goodwill (Textuals)
Finite-Lived Intangible Assets, Weighted-Average Useful Life					21 years
Consumer
Intangible Assets and Goodwill (Textuals)
Goodwill	9,817				$ 9,817			8,670
PHARMACEUTICAL
Intangible Assets and Goodwill (Textuals)
Goodwill	9,104				9,104			9,063
Medical Devices
Intangible Assets and Goodwill (Textuals)
Goodwill	14,740				14,740			12,720
Purchased In-Process Research And Development
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	4,323				4,323			$ 2,253
Alios Biopharma Inc | Purchased In-Process Research And Development
Finite-Lived Intangible Assets [Line Items]
Impairment charge		$ 900	$ 800
Auris Health
Intangible Assets and Goodwill (Textuals)
Goodwill							$ 2,000
Auris Health | Purchased In-Process Research And Development
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 2,900				$ 2,900