Intangible Assets and Goodwill - Schedule of Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Finite-Lived And Indefinite-Lived Intangible Assets [Line Items]
Research and Development in Process	$ 890	$ 1,126	$ 890	$ 1,126	$ 408
Intangible assets with indefinite lives:
Indefinite lived intangible assets			11,569	9,190
Total intangible assets - net			47,643	47,611
Trademarks
Intangible assets with indefinite lives:
Indefinite lived intangible assets			6,922	6,937
Purchased in-process research and development
Intangible assets with indefinite lives:
Indefinite lived intangible assets			4,647	2,253
Patents And Trademarks
Intangible assets with definite lives:
Finite lived intangible assets gross			36,634	35,194
Less accumulated amortization			13,154	9,784
Finite lived intangible assets net			23,480	25,410
Customer relationships and other intangible assets
Intangible assets with definite lives:
Finite lived intangible assets gross			22,056	21,334
Less accumulated amortization			9,462	8,323
Finite lived intangible assets net			12,594	$ 13,011
Auris Health | Purchased in-process research and development
Finite-Lived And Indefinite-Lived Intangible Assets [Line Items]
Research and Development in Process			$ 2,900
Alios Biopharma Inc | Purchased in-process research and development
Intangible assets with indefinite lives:
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 900	$ 800