Inventories and Contracts in Progress (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Sikorsky [Member]	Dec. 31, 2013 Sikorsky [Member]	Sep. 30, 2014 UTC Aerospace Systems [Member]	Dec. 31, 2013 UTC Aerospace Systems [Member]
Inventory [Line Items]
Other Inventory, Capitalized Costs, Gross				$ 740,000,000	$ 149,000,000	$ 159,000,000
Inventory Adjustments			1,300,000,000.0
Raw materials	2,073,000,000	1,983,000,000
Work-in-process	3,945,000,000	4,600,000,000
Finished goods	3,957,000,000	3,360,000,000
Contracts in progress	8,756,000,000	7,929,000,000
Inventory before payments and billings	18,731,000,000	17,872,000,000
Progress payments, secured by lien, on U.S. Government contracts	(440,000,000)	(279,000,000)
Billings on contracts in progress	(7,950,000,000)	(7,263,000,000)
Inventories and contracts in progress, net	$ 10,341,000,000	$ 10,330,000,000