Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 18,751	$ 18,104
Accumulated Amortization	4,980	4,570
Unamortized: Trademarks and Other	2,071	2,069
Total Intangible Assets Gross Excluding Goodwill	20,822	20,173
Service portfolios [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	2,024	1,977
Accumulated Amortization	1,355	1,307
Patents and trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	382	361
Accumulated Amortization	200	189
IAE collaboration [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	3,537	3,336
Accumulated Amortization	146	86
Customer relationships and other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	12,808	12,430
Accumulated Amortization	$ 3,279	$ 2,988