Inventories and Contracts in Progress (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 2,011	$ 2,056
Work-in-process	3,881	3,596
Finished goods	4,116	3,776
Contracts in progress	8,579	8,189
Inventory before payments and billings	18,587	17,617
Progress payments, secured by lien, on U.S. Government contracts	498	300
Billings on contracts in progress	7,794	7,452
Inventories and contracts in progress, net	10,295	9,865
UTC Aerospace Systems [Member]
Inventory [Line Items]
Other Inventory, Capitalized Costs, Gross	$ 185	$ 141