| **BUSINESS SEGMENTS - Revenue, Operating Income and Other Selected Financial Information (Details) $ in Millions** | 3 Months Ended | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |
| Revenue                                                                                                            |           | $ 6,168         | $ 5,897 |
| **Income from Continuing Operations before Income Taxes**                                                          |           |            |   |
| Non-operating income                                                                                               |           | 156             | 166 |
| Net interest expense                                                                                               |           | (168)           | (170) |
| Income from continuing operations before income taxes                                                              |           | $ 908           | 889 |
| Number of reportable segments | segment                                                                            |           | 3               |   |
| Amortization expense related to intangible assets                                                                  |           | $ 117           | 126 |
| Losses and other costs relate to debt refinancing                                                                  |           | 24              | 0 |
| **Selected Financial Information by Business Segment and Geographical Area**                                       |           |            |   |
| Capital Expenditures                                                                                               |           | 136             | 119 |
| Depreciation and Amortization                                                                                      |           | 259             | 311 |
| Fixed-rate debt                                                                                                    |           |            |   |
| **Income from Continuing Operations before Income Taxes**                                                          |           |            |   |
| Losses and other costs relate to debt refinancing                                                                  | $ 22           | 27              |   |
| Exelis                                                                                                             |           |            |   |
| **Income from Continuing Operations before Income Taxes**                                                          |           |            |   |
| Amortization expense related to intangible assets                                                                  |           | 101             | 109 |
| US Operations                                                                                                      |           |            |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |
| Revenue                                                                                                            |           | 5,854           | 5,637 |
| **Selected Financial Information by Business Segment and Geographical Area**                                       |           |            |   |
| Long-lived assets                                                                                                  | 892            | 892             | 896 |
| International Operations                                                                                           |           |            |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |
| Revenue                                                                                                            |           | 314             | 260 |
| **Selected Financial Information by Business Segment and Geographical Area**                                       |           |            |   |
| Long-lived assets                                                                                                  | $ 8            | 8               | 8 |
| Discontinued operations                                                                                            |           |            |   |
| **Selected Financial Information by Business Segment and Geographical Area**                                       |           |            |   |
| Capital Expenditures                                                                                               |           | 0               | 4 |
| Depreciation and Amortization                                                                                      |           | 0               | 39 |
| Communication Systems                                                                                              |           |            |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |
| Revenue                                                                                                            |           | 1,904           | 1,754 |
| Electronic Systems                                                                                                 |           |            |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |
| Revenue                                                                                                            |           | 2,365           | 2,245 |
| Space and Intelligence Systems                                                                                     |           |            |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |
| Revenue                                                                                                            |           | 1,913           | 1,904 |
| Operating Segments | Communication Systems                                                                         |           |            |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |
| Revenue                                                                                                            |           | 1,904           | 1,754 |
| **Income from Continuing Operations before Income Taxes**                                                          |           |            |   |
| Segment Operating Income                                                                                           |           | 566             | 514 |
| **Selected Financial Information by Business Segment and Geographical Area**                                       |           |            |   |
| Capital Expenditures                                                                                               |           | 26              | 14 |
| Depreciation and Amortization                                                                                      |           | 57              | 64 |
| Operating Segments | Electronic Systems                                                                            |           |            |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |
| Revenue                                                                                                            |           | 2,365           | 2,245 |
| **Income from Continuing Operations before Income Taxes**                                                          |           |            |   |
| Segment Operating Income                                                                                           |           | 432             | 457 |
| **Selected Financial Information by Business Segment and Geographical Area**                                       |           |            |   |
| Capital Expenditures                                                                                               |           | 57              | 40 |
| Depreciation and Amortization                                                                                      |           | 44              | 29 |
| Operating Segments | Space and Intelligence Systems                                                                |           |            |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |
| Revenue                                                                                                            |           | 1,913           | 1,904 |
| **Income from Continuing Operations before Income Taxes**                                                          |           |            |   |
| Segment Operating Income                                                                                           |           | 331             | 314 |
| **Selected Financial Information by Business Segment and Geographical Area**                                       |           |            |   |
| Capital Expenditures                                                                                               |           | 33              | 34 |
| Depreciation and Amortization                                                                                      |           | 36              | 37 |
| Corporate                                                                                                          |           |            |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |
| Revenue                                                                                                            |           | (14)            | (6) |
| **Selected Financial Information by Business Segment and Geographical Area**                                       |           |            |   |
| Capital Expenditures                                                                                               |           | 20              | 27 |
| Depreciation and Amortization                                                                                      |           | 122             | 142 |
| Unallocated corporate expense                                                                                      |           |            |   |
| **Income from Continuing Operations before Income Taxes**                                                          |           |            |   |
| Segment Operating Income                                                                                           |           | (225)           | (228) |
| Pension adjustment                                                                                                 |           | (184)           | (164) |
| Adjustment for compensation expense                                                                                |           | 12              |   |
| Unallocated corporate expense | Non-core Commercial Business | Business Exit                                       |           |            |   |
| **Income from Continuing Operations before Income Taxes**                                                          |           |            |   |
| Business charges in connection with transition and exit costs                                                      |           | 47              |   |
| Unallocated corporate expense | Exelis                                                                             |           |            |   |
| **Income from Continuing Operations before Income Taxes**                                                          |           |            |   |
| Amortization expense related to intangible assets                                                                  |           | 101             | 109 |
| Integration and other business acquisition related costs                                                           |           | $ 5             | $ 58 |

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Revenue and income from continuing operations before income taxes by segment
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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.
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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.
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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.
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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.
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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.
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The net amount of operating interest income (expense).
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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.
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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.
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The net result for the period of deducting operating expenses from operating revenues.
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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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