Segment Financial Data (Table) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Total net sales	$ 16,168		$ 15,462	$ 48,104	$ 45,867
Operating profit	2,746		2,366	7,199	6,879
Operating profit margin	17.00%		15.30%	15.00%	15.00%
UTC Climate, Controls and Security [Member]
Segment Reporting Information [Line Items]
Total net sales	4,351		4,237	12,631	12,617
Operating profit	807		696	2,159	1,968
Operating profit margin	18.50%		16.40%	17.10%	15.60%
Otis [Member]
Segment Reporting Information [Line Items]
Total net sales	3,326		3,188	9,646	9,140
Operating profit	703		681	1,966	1,906
Operating profit margin	21.10%		21.40%	20.40%	20.90%
Pratt and Whitney [Member]
Segment Reporting Information [Line Items]
Total net sales	3,564		3,386	10,485	10,412
Operating profit	633		439	1,453	1,412
Operating profit margin	17.80%		13.00%	13.90%	13.60%
UTC Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Total net sales	3,535		3,312	10,621	9,896
Operating profit	575		501	1,767	1,501
Operating profit margin	16.30%		15.10%	16.60%	15.20%
Sikorsky [Member]
Segment Reporting Information [Line Items]
Total net sales	1,620		1,541	5,365	4,356
Operating profit	152		159	(79)	405
Operating profit margin	9.40%		10.30%	(1.50%)	9.30%
Other Nonrecurring Income		830
Other Nonrecurring Expense		1,268
Total Segments [Member]
Segment Reporting Information [Line Items]
Total net sales	16,396		15,664	48,748	46,421
Operating profit	2,870		2,476	7,266	7,192
Operating profit margin	17.50%		15.80%	14.90%	15.50%
Eliminations and other [Member]
Segment Reporting Information [Line Items]
Total net sales	(228)		(202)	(644)	(554)
Operating profit	0		7	288	32
General corporate expenses [Member]
Segment Reporting Information [Line Items]
Total net sales	0		0	0	0
Operating profit	$ (124)		$ (117)	$ (355)	$ (345)