Segment Financial Data (Table) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Total net sales	$ 16,333	$ 17,191	$ 30,874	$ 31,936
Operating profit	$ 2,552	$ 2,355	$ 4,826	$ 4,453
Operating profit margin	15.60%	13.70%	15.60%	13.90%
Otis [Member]
Segment Reporting Information [Line Items]
Total net sales	$ 3,098	$ 3,365	$ 5,843	$ 6,320
Operating profit	$ 627	$ 693	$ 1,154	$ 1,263
Operating profit margin	20.20%	20.60%	19.80%	20.00%
UTC Climate, Controls & Security [Member]
Segment Reporting Information [Line Items]
Total net sales	$ 4,454	$ 4,429	$ 8,306	$ 8,280
Operating profit	$ 823	$ 815	$ 1,552	$ 1,352
Operating profit margin	18.50%	18.40%	18.70%	16.30%
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Total net sales	$ 3,677	$ 3,592	$ 7,009	$ 6,921
Operating profit	$ 487	$ 432	$ 906	$ 820
Operating profit margin	13.20%	12.00%	12.90%	11.80%
UTC Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Total net sales	$ 3,632	$ 3,636	$ 7,180	$ 7,086
Operating profit	$ 580	$ 602	$ 1,149	$ 1,192
Operating profit margin	16.00%	16.60%	16.00%	16.80%
Sikorsky [Member]
Segment Reporting Information [Line Items]
Total net sales	$ 1,691	$ 2,384	$ 2,958	$ 3,745
Operating profit	$ 165	$ (317)	$ 257	$ (231)
Operating profit margin	9.80%	(13.30%)	8.70%	(6.20%)
Total Segments [Member]
Segment Reporting Information [Line Items]
Total net sales	$ 16,552	$ 17,406	$ 31,296	$ 32,352
Operating profit	$ 2,682	$ 2,225	$ 5,018	$ 4,396
Operating profit margin	16.20%	12.80%	16.00%	13.60%
Eliminations and other [Member]
Segment Reporting Information [Line Items]
Total net sales	$ (219)	$ (215)	$ (422)	$ (416)
Operating profit	(10)	249	38	288
General corporate expenses [Member]
Segment Reporting Information [Line Items]
Total net sales	0	0	0	0
Operating profit	$ (120)	$ (119)	$ (230)	$ (231)