Acquisition-related Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	$ 24,690	$ 24,974
Accumulated Amortization	(10,277)	(9,564)
Definite-Lived Intangible Assets, Net	14,413	15,410
Indefinite-Lived Intangible Assets	1,267	1,274
Acquisition-related Intangible Assets, Gross	25,957	26,248
Acquisition-related Intangible Assets, net of Accumulated Amortization	15,680	16,684
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	32	39
Customer Relationships [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	17,129	17,356
Accumulated Amortization	(6,336)	(5,902)
Definite-Lived Intangible Assets, Net	10,793	11,454
Product Technology [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	6,012	6,046
Accumulated Amortization	(3,024)	(2,811)
Definite-Lived Intangible Assets, Net	2,988	3,235
Tradenames [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	1,516	1,538
Accumulated Amortization	(884)	(817)
Definite-Lived Intangible Assets, Net	632	721
Other Intangible Assets [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	33	34
Accumulated Amortization	(33)	(34)
Definite-Lived Intangible Assets, Net	$ 0	$ 0