Restructuring and Other Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			$ 180
Restructuring Reserve, Two Years Prior Actions	67		67
Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve Beginning Balance	80
Net pre-tax restructuring costs	61		151
Utilization and foreign exchange	(28)
Restructuring Reserve Ending Balance	113		113
Restructuring and Related Cost, Incurred Cost	(61)	(90)
Restructuring and Related Cost, Expected Cost			239
Restructuring And Related Cost Expected Remaining	88		88
Current Year Actions [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve Beginning Balance	80
Net pre-tax restructuring costs	58
Utilization and foreign exchange	(26)
Restructuring Reserve Ending Balance	112		112
Current Year Actions [Member] | Asset Write-Downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve Beginning Balance	0
Net pre-tax restructuring costs	0
Utilization and foreign exchange	0
Restructuring Reserve Ending Balance	0		0
Current Year Actions [Member] | Facility Exit, Lease Termination and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve Beginning Balance	0
Net pre-tax restructuring costs	3
Utilization and foreign exchange	(2)
Restructuring Reserve Ending Balance	1		1
Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve Beginning Balance	194
Net pre-tax restructuring costs	1		33
Utilization and foreign exchange	(40)
Restructuring Reserve Ending Balance	155		155
Restructuring and Related Cost, Incurred Cost	(1)	(32)		(421)
Restructuring and Related Cost, Expected Cost			479
Restructuring And Related Cost Expected Remaining	25		25
Prior Year Actions [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve Beginning Balance	172
Net pre-tax restructuring costs	(5)
Utilization and foreign exchange	(35)
Restructuring Reserve Ending Balance	132		132
Prior Year Actions [Member] | Asset Write-Downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve Beginning Balance	0
Net pre-tax restructuring costs	0
Utilization and foreign exchange	0
Restructuring Reserve Ending Balance	0		0
Prior Year Actions [Member] | Facility Exit, Lease Termination and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve Beginning Balance	22
Net pre-tax restructuring costs	6
Utilization and foreign exchange	(5)
Restructuring Reserve Ending Balance	23		23
Otis [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			38
Otis [Member] | Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	(28)	(18)
Restructuring and Related Cost, Expected Cost			71
Restructuring And Related Cost Expected Remaining	25		25
Otis [Member] | Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	2	(1)		(69)
Restructuring and Related Cost, Expected Cost			69
Restructuring And Related Cost Expected Remaining	1		1
UTC Climate Controls and Security [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			68
UTC Climate Controls and Security [Member] | Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	(21)	(16)
Restructuring and Related Cost, Expected Cost			77
Restructuring And Related Cost Expected Remaining	40		40
UTC Climate Controls and Security [Member] | Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	(2)	(24)		(89)
Restructuring and Related Cost, Expected Cost			119
Restructuring And Related Cost Expected Remaining	4		4
Pratt and Whitney [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			47
Pratt and Whitney [Member] | Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	(10)	(37)
Restructuring and Related Cost, Expected Cost			70
Restructuring And Related Cost Expected Remaining	23		23
Pratt and Whitney [Member] | Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	1	(6)		(154)
Restructuring and Related Cost, Expected Cost			163
Restructuring And Related Cost Expected Remaining	4		4
UTC Aerospace Systems [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			10
UTC Aerospace Systems [Member] | Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	(2)	(3)
Restructuring and Related Cost, Expected Cost			5
Restructuring And Related Cost Expected Remaining	0		0
UTC Aerospace Systems [Member] | Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	(3)	(1)		(71)
Restructuring and Related Cost, Expected Cost			91
Restructuring And Related Cost Expected Remaining	16		16
Sikorsky [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			17
Sikorsky [Member] | Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0	(16)
Restructuring and Related Cost, Expected Cost			16
Restructuring And Related Cost Expected Remaining	0		0
Sikorsky [Member] | Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	1	0		(38)
Restructuring and Related Cost, Expected Cost			37
Restructuring And Related Cost Expected Remaining	0		0
Cost Of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			111
Cost Of Sales [Member] | Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			83
Cost Of Sales [Member] | Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			30
Selling General and Administrative [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			69
Selling General and Administrative [Member] | Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			68
Selling General and Administrative [Member] | Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs			$ 3