Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 19,249	$ 18,895
Accumulated Amortization	5,515	5,236
Unamortized: Trademarks and Other	2,046	2,025
Total Intangible Assets Gross Excluding Goodwill	21,295	20,920
Service portfolios [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	2,073	1,995
Accumulated Amortization	1,412	1,344
Patents and trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	384	378
Accumulated Amortization	208	201
Collaboration intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	3,825	3,724
Accumulated Amortization	255	211
Customer relationships and other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	12,967	12,798
Accumulated Amortization	$ 3,640	$ 3,480