Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Dec. 30, 2018
Intangible assets with indefinite lives:
Indefinite-Lived Intangible Assets	$ 8,303		$ 9,190
Total intangible assets - net	46,898		47,611
Trademarks
Intangible assets with indefinite lives:
Indefinite-Lived Intangible Assets	6,912		6,937
Purchased In-Process Research And Development
Intangible assets with indefinite lives:
Indefinite-Lived Intangible Assets	1,391		2,253
Patents And Trademarks
Intangible assets with definite lives:
Finite-Lived Intangible Assets, Gross	35,963		35,194
Less accumulated amortization	10,548		9,784
Finite-Lived Intangible Assets, Net	25,415		25,410
Customer relationships and other intangible assets
Intangible assets with definite lives:
Finite-Lived Intangible Assets, Gross	21,766		21,334
Less accumulated amortization	8,586		8,323
Finite-Lived Intangible Assets, Net	13,180		$ 13,011
Alios Biopharma Inc | Purchased In-Process Research And Development
Intangible assets with indefinite lives:
Impairment charge	$ 900	$ 800