Acquisition, Dispositions, Goodwill and Other Intangible Assets (Goodwill) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Goodwill [Line Items]
Goodwill - Beginning Balance	$ 28,168
Goodwill Resulting from Business Combinations	31
Goodwill - Foreign Currency Translation and Other	179
Goodwill - Ending Balance	28,378
Otis [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	1,741
Goodwill Resulting from Business Combinations	22
Goodwill - Foreign Currency Translation and Other	20
Goodwill - Ending Balance	1,783
UTC Climate Controls and Security [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	9,727
Goodwill Resulting from Business Combinations	9
Goodwill - Foreign Currency Translation and Other	92
Goodwill - Ending Balance	9,828
Pratt and Whitney [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	1,273
Goodwill Resulting from Business Combinations	0
Goodwill - Foreign Currency Translation and Other	0
Goodwill - Ending Balance	1,273
UTC Aerospace Systems [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	15,069
Goodwill Resulting from Business Combinations	0
Goodwill - Foreign Currency Translation and Other	67
Goodwill - Ending Balance	15,136
Sikorsky [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	353
Goodwill Resulting from Business Combinations	0
Goodwill - Foreign Currency Translation and Other	0
Goodwill - Ending Balance	353
Total Segments [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	28,163
Goodwill Resulting from Business Combinations	31
Goodwill - Foreign Currency Translation and Other	179
Goodwill - Ending Balance	28,373
Eliminations and other [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	5
Goodwill Resulting from Business Combinations	0
Goodwill - Foreign Currency Translation and Other	0
Goodwill - Ending Balance	$ 5