Segment Financial Data (Table) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Total net sales	$ 16,006	$ 13,807	$ 30,405	$ 26,223
Operating profit	2,507	2,179	4,513	3,892
Operating profit margin	15.70%	15.80%	14.80%	14.80%
Otis [Member]
Segment Reporting Information [Line Items]
Total net sales	3,138	3,027	5,952	5,797
Operating profit	650	651	1,225	1,217
Operating profit margin	20.70%	21.50%	20.60%	21.00%
UTC Climate Controls and Security [Member]
Segment Reporting Information [Line Items]
Total net sales	4,543	4,572	8,380	8,684
Operating profit	752	789	1,272	1,333
Operating profit margin	16.60%	17.30%	15.20%	15.40%
Pratt and Whitney [Member]
Segment Reporting Information [Line Items]
Total net sales	3,624	3,447	7,026	6,499
Operating profit	567	427	973	816
Operating profit margin	15.60%	12.40%	13.80%	12.60%
UTC Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Total net sales	3,321	1,254	6,584	2,490
Operating profit	499	211	1,000	409
Operating profit margin	15.00%	16.80%	15.20%	16.40%
Sikorsky [Member]
Segment Reporting Information [Line Items]
Total net sales	1,566	1,620	2,815	2,966
Operating profit	156	213	246	349
Operating profit margin	10.00%	13.10%	8.70%	11.80%
Total Segments [Member]
Segment Reporting Information [Line Items]
Total net sales	16,192	13,920	30,757	26,436
Operating profit	2,624	2,291	4,716	4,124
Operating profit margin	16.20%	16.50%	15.30%	15.60%
Eliminations and other [Member]
Segment Reporting Information [Line Items]
Total net sales	(186)	(113)	(352)	(213)
Operating profit	4	(8)	25	(32)
General corporate expenses [Member]
Segment Reporting Information [Line Items]
Total net sales	0	0	0	0
Operating profit	$ (121)	$ (104)	$ (228)	$ (200)