Acquisition-related Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Definite-Lived Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	$ 25,128	$ 24,974
Accumulated Amortization	(10,020)	(9,564)
Definite-Lived Intangible Assets, Net	15,108	15,410
Indefinite-Lived Intangible Assets	1,285	1,274
Acquisition-related Intangible Assets, Gross	26,413	26,248
Acquisition-related Intangible Assets, net of Accumulated Amortization	16,393	16,684
Tradenames [Member]
Definite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	1,235	1,235
In-Process Research and Development [Member]
Definite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	50	39
Customer Relationships [Member]
Definite-Lived Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	17,439	17,356
Accumulated Amortization	(6,170)	(5,902)
Definite-Lived Intangible Assets, Net	11,269	11,454
Product Technology [Member]
Definite-Lived Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	6,107	6,046
Accumulated Amortization	(2,953)	(2,811)
Definite-Lived Intangible Assets, Net	3,154	3,235
Tradenames [Member]
Definite-Lived Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	1,547	1,538
Accumulated Amortization	(862)	(817)
Definite-Lived Intangible Assets, Net	685	721
Other Intangible Assets [Member]
Definite-Lived Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	35	34
Accumulated Amortization	(35)	(34)
Definite-Lived Intangible Assets, Net	$ 0	$ 0