Inventories and Contracts in Progress (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 1,695	$ 1,683
Work-in-process	2,519	2,099
Finished goods	3,654	3,234
Contracts in progress	8,685	8,189
Inventory before payments and billings	16,553	15,205
Progress payments, secured by lien, on U.S. Government contracts	270	117
Billings on contracts in progress	7,830	7,446
Inventories and contracts in progress, net	8,453	7,642
UTC Aerospace Systems [Member]
Inventory [Line Items]
Other Inventory, Capitalized Costs, Gross	$ 183	$ 141