Segment Financial Data (Table) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total net sales	$ 13,788	$ 14,613	$ 41,798	$ 42,920
Operating profit	$ 2,302	$ 2,612	$ 6,899	$ 7,313
Operating profit margin	16.70%	17.90%	16.50%	17.00%
Otis [Member]
Segment Reporting Information [Line Items]
Total net sales	$ 3,043	$ 3,326	$ 8,886	$ 9,646
Operating profit	$ 642	$ 703	$ 1,796	$ 1,966
Operating profit margin	21.10%	21.10%	20.20%	20.40%
UTC Climate, Controls & Security [Member]
Segment Reporting Information [Line Items]
Total net sales	$ 4,279	$ 4,351	$ 12,585	$ 12,631
Operating profit	$ 771	$ 807	$ 2,323	$ 2,159
Operating profit margin	18.00%	18.50%	18.50%	17.10%
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Total net sales	$ 3,234	$ 3,564	$ 10,243	$ 10,485
Operating profit	$ 419	$ 633	$ 1,325	$ 1,453
Operating profit margin	13.00%	17.80%	12.90%	13.90%
UTC Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Total net sales	$ 3,457	$ 3,535	$ 10,637	$ 10,621
Operating profit	$ 572	$ 575	$ 1,721	$ 1,767
Operating profit margin	16.50%	16.30%	16.20%	16.60%
Total Segments [Member]
Segment Reporting Information [Line Items]
Total net sales	$ 14,013	$ 14,776	$ 42,351	$ 43,383
Operating profit	$ 2,404	$ 2,718	$ 7,165	$ 7,345
Operating profit margin	17.20%	18.40%	16.90%	16.90%
Eliminations and other [Member]
Segment Reporting Information [Line Items]
Total net sales	$ (225)	$ (163)	$ (553)	$ (463)
Operating profit	(1)	18	65	323
General corporate expenses [Member]
Segment Reporting Information [Line Items]
Total net sales	0	0	0	0
Operating profit	$ (101)	$ (124)	$ (331)	$ (355)