Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 17,482		$ 17,482		$ 16,936
Accumulated Amortization	(4,049)		(4,049)		(3,675)
Unamortized: Trademarks and Other	2,282		2,282		2,260
Total Intangible Assets Gross Excluding Goodwill	19,764		19,764		19,196
Amortization of Intangible Assets	178	176	357	351
Service portfolios [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	2,279		2,279		2,234
Accumulated Amortization	(1,369)		(1,369)		(1,295)
Patents and trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	383		383		380
Accumulated Amortization	(190)		(190)		(181)
IAE collaboration [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	2,588		2,588		2,273
Accumulated Amortization	(10)		(10)		0
Customer relationships and other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	12,232		12,232		12,049
Accumulated Amortization	$ (2,480)		$ (2,480)		$ (2,199)