Inventories and Contracts in Progress (Details) - USD ($) $ in Millions |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Inventory Disclosure [Abstract] | ||
| Raw materials | $ 2,209 | $ 2,037 |
| Work-in-process | 2,807 | 2,422 |
| Finished goods | 3,438 | 3,183 |
| Contracts in progress | 9,580 | 8,668 |
| Inventory before payments and billings | 18,034 | 16,310 |
| Progress payments, secured by lien, on U.S. Government contracts | 157 | 239 |
| Billings on contracts in progress | 8,796 | 7,936 |
| Inventories and contracts in progress, net | 9,081 | 8,135 |
| Inventory [Line Items] | ||
| Inventory Costs in Excess of Average Cost Per Unit | 144 | 13 |
| UTC Aerospace Systems [Member] | ||
| Inventory [Line Items] | ||
| Other Inventory, Capitalized Costs, Gross | $ 148 | $ 152 |