| **Business Combinations - Fair Value of Assets and Liabilities Acquired (Details) - USD ($) $ in Millions** | 12 Months Ended |         |         |         |         |
|-------------------------------------------------------------------------------------------------------------|-----------------|---------|---------|---------|---------|
||
| **Business Acquisition [Line Items]**                                                                       |            |    |    |    |    |
| Goodwill                                                                                                    |            | $ 5,975 | $ 6,348 |    | $ 1,711 |
| Exelis                                                                                                      |            |    |    |    |    |
| **Business Acquisition [Line Items]**                                                                       |            |    |    |    |    |
| Receivables                                                                                                 | $ 568           |    |    | $ 592   |    |
| Inventories                                                                                                 | 400             |    |    | 438     |    |
| Other current assets                                                                                        | 602             |    |    | 587     |    |
| Property, plant and equipment                                                                               | 491             |    |    | 458     |    |
| Goodwill                                                                                                    | 4,730           |    |    | 4,690   |    |
| Identifiable intangible assets                                                                              | 1,618           | $ 1,618 |    | 1,606   |    |
| Other non-current assets                                                                                    | 289             |    |    | 173     |    |
| Total assets acquired                                                                                       | 8,698           |    |    | 8,544   |    |
| Accounts payable and accrued expenses                                                                       | 622             |    |    | 489     |    |
| Advance payments and unearned income                                                                        | 207             |    |    | 225     |    |
| Defined benefit plans                                                                                       | 2,311           |    |    | 2,311   |    |
| Long-term debt                                                                                              | 726             |    |    | 726     |    |
| Other long-term liabilities                                                                                 | 123             |    |    | 84      |    |
| Total liabilities assumed                                                                                   | 3,989           |    |    | 3,835   |    |
| Net assets acquired                                                                                         | 4,709           |    |    | $ 4,709 |    |
| **Measurement period adjustments, net**                                                                     |            |    |    |    |    |
| Receivables                                                                                                 | (24)            |    |    |    |    |
| Inventories                                                                                                 | (38)            |    |    |    |    |
| Other current assets                                                                                        | 15              |    |    |    |    |
| Property, plant and equipment                                                                               | 33              |    |    |    |    |
| Goodwill                                                                                                    | 40              |    |    |    |    |
| Identifiable intangible assets                                                                              | 12              |    |    |    |    |
| Other non-current assets                                                                                    | 116             |    |    |    |    |
| Total assets acquired                                                                                       | 154             |    |    |    |    |
| Accounts payable and accrued expenses                                                                       | 133             |    |    |    |    |
| Advance payments and unearned income                                                                        | (18)            |    |    |    |    |
| Defined benefit plans                                                                                       | 0               |    |    |    |    |
| Long-term debt                                                                                              | 0               |    |    |    |    |
| Other long-term liabilities                                                                                 | 39              |    |    |    |    |
| Total liabilities assumed                                                                                   | 154             |    |    |    |    |
| Net assets acquired                                                                                         | $ 0             |    |    |    |    |

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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.
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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to property, plant, and equipment acquired in connection with a business combination for which the initial accounting was incomplete.
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Amount of assets acquired at the acquisition date.
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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.
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Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.
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Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.
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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.
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The amount of inventory recognized as of the acquisition date.
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Amount of liabilities assumed at the acquisition date.
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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.
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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.
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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.
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The amount of property, plant, and equipment recognized as of the acquisition date.
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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.
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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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