Segment Financial Data (Table) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Total net sales	$ 15,462	$ 15,042	$ 45,867	$ 41,265
Operating profit	2,366	2,041	6,879	5,933
Operating profit margin	15.30%	13.60%	15.00%	14.40%
Otis [Member]
Segment Reporting Information [Line Items]
Total net sales	3,188	3,054	9,140	8,851
Operating profit	681	651	1,906	1,868
Operating profit margin	21.40%	21.30%	20.90%	21.10%
UTC Climate Controls and Security [Member]
Segment Reporting Information [Line Items]
Total net sales	4,237	4,259	12,617	12,943
Operating profit	696	632	1,968	1,965
Operating profit margin	16.40%	14.80%	15.60%	15.20%
Pratt and Whitney [Member]
Segment Reporting Information [Line Items]
Total net sales	3,386	3,574	10,412	10,073
Operating profit	439	409	1,412	1,225
Operating profit margin	13.00%	11.40%	13.60%	12.20%
UTC Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Total net sales	3,312	2,670	9,896	5,160
Operating profit	501	271	1,501	680
Operating profit margin	15.10%	10.10%	15.20%	13.20%
Sikorsky [Member]
Segment Reporting Information [Line Items]
Total net sales	1,541	1,649	4,356	4,615
Operating profit	159	203	405	552
Operating profit margin	10.30%	12.30%	9.30%	12.00%
Total Segments [Member]
Segment Reporting Information [Line Items]
Total net sales	15,664	15,206	46,421	41,642
Operating profit	2,476	2,166	7,192	6,290
Operating profit margin	15.80%	14.20%	15.50%	15.10%
Eliminations and other [Member]
Segment Reporting Information [Line Items]
Total net sales	(202)	(164)	(554)	(377)
Operating profit	7	(22)	32	(54)
General corporate expenses [Member]
Segment Reporting Information [Line Items]
Total net sales	0	0	0	0
Operating profit	$ (117)	$ (103)	$ (345)	$ (303)