| Schedule of Inventory, Current [Table Text Block] |
| | | | | | | | | (Dollars in millions) | September 30, 2017 | | December 31, 2016 | Raw materials | $ | 2,189 |
| | $ | 2,040 |
| Work-in-process | 3,453 |
| | 2,787 |
| Finished goods | 3,715 |
| | 3,305 |
| Contracts in progress | 10,417 |
| | 9,395 |
| | 19,774 |
| | 17,527 |
| Less: | | | | Progress payments, secured by lien, on U.S. Government contracts | (224 | ) | | (130 | ) | Billings on contracts in progress | (9,467 | ) | | (8,693 | ) | | $ | 10,083 |
| | $ | 8,704 |
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