Segment Financial Data (Table) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Total net sales	$ 14,541	$ 14,745
Operating profit	2,274	2,098
Operating profit margin	15.60%	14.20%
Otis [Member]
Segment Reporting Information [Line Items]
Total net sales	2,745	2,955
Operating profit	527	570
Operating profit margin	19.20%	19.30%
UTC Climate, Controls & Security [Member]
Segment Reporting Information [Line Items]
Total net sales	3,852	3,851
Operating profit	729	537
Operating profit margin	18.90%	13.90%
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Total net sales	3,332	3,329
Operating profit	419	388
Operating profit margin	12.60%	11.70%
UTC Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Total net sales	3,548	3,450
Operating profit	569	590
Operating profit margin	16.00%	17.10%
Sikorsky [Member]
Segment Reporting Information [Line Items]
Total net sales	1,267	1,361
Operating profit	92	86
Operating profit margin	7.30%	6.30%
Total Segments [Member]
Segment Reporting Information [Line Items]
Total net sales	14,744	14,946
Operating profit	2,336	2,171
Operating profit margin	15.80%	14.50%
Eliminations and other [Member]
Segment Reporting Information [Line Items]
Total net sales	(203)	(201)
Operating profit	48	39
General corporate expenses [Member]
Segment Reporting Information [Line Items]
Total net sales	0	0
Operating profit	$ (110)	$ (112)