Acquisitions/Divestitures (Narratives) (Details 1) (USD $) In Millions, unless otherwise specified	9 Months Ended			9 Months Ended			3 Months Ended			9 Months Ended
	Sep. 30, 2014 acquisitions	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014 Software acquisitions	Dec. 31, 2013 Software	Dec. 31, 2012 Software	Sep. 30, 2014 Global Technology Services acquisitions	Dec. 31, 2013 Global Technology Services	Dec. 31, 2012 Global Technology Services	Sep. 30, 2014 Acquisitions	Sep. 30, 2014 Acquisitions Software	Sep. 30, 2014 Acquisitions Global Technology Services
Acquisitions:
Businesses acquired, number (in entities)	6
Businesses acquired, aggregate cost	$ 608
Acquired intangible asset, weighted average useful life										6 years 10 months
Expected percent of goodwill deductible for tax purposes										1.00%
Total purchase price										608
Goodwill	$ 31,045	$ 31,184	$ 29,247	$ 21,210	$ 21,121	$ 20,405	$ 4,055	$ 4,129	$ 2,916	$ 445	$ 434	$ 11
Businesses acquired, privately held companies number				5			1