Acquisition-related Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	$ 24,974	$ 20,332
Accumulated Amortization	(9,564)	(7,704)
Definite-Lived Intangible Assets, Net	15,410	12,628
Indefinite-Lived Intangible Assets	1,274	1,341
Acquisition-related Intangible Assets, Gross	26,248	21,673
Acquisition-related Intangible Assets, net of Accumulated Amortization	16,684	13,969
Amortization of Acquisition-related Intangible Assets	$ 1,590	1,380	$ 1,310
Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life (in years)	3 years
Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life (in years)	20 years
Tradenames [Member]
Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	$ 1,235	1,235
In-Process Research and Development [Member]
Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	39	106
Customer Relationships [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	17,356	13,167
Accumulated Amortization	(5,902)	(4,821)
Definite-Lived Intangible Assets, Net	11,454	8,346
Product Technology [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	6,046	5,680
Accumulated Amortization	(2,811)	(2,204)
Definite-Lived Intangible Assets, Net	3,235	3,476
Tradenames [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	1,538	1,452
Accumulated Amortization	(817)	(646)
Definite-Lived Intangible Assets, Net	721	806
Other Intangible Assets [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	34	33
Accumulated Amortization	(34)	(33)
Definite-Lived Intangible Assets, Net	$ 0	$ 0