| **ACQUISITIONS AND DIVESTITURES - Aerojet Rocketdyne Holdings Assets Acquired, Liabilities Assumed (Details) - USD ($) $ in Millions** | 11 Months Ended |          |         |
|----------------------------------------------------------------------------------------------------------------------------------------|-----------------|----------|---------|
||
| **Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]**                   |            |     |    |
| Goodwill                                                                                                                               | $ 20,367        | $ 19,979 |    |
| Aerojet Rocketdyne Holdings, Inc.                                                                                                      |            |     |    |
| **Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]**                   |            |     |    |
| Receivables                                                                                                                            | 156             |     | $ 156   |
| Contract assets                                                                                                                        | 197             |     | 338     |
| Inventories                                                                                                                            | 14              |     | 14      |
| Other current assets                                                                                                                   | 139             |     | 117     |
| Property, plant and equipment                                                                                                          | 584             |     | 574     |
| Goodwill                                                                                                                               | 2,861           |     | 2,348   |
| Other intangible assets                                                                                                                | 2,860           |     | 2,860   |
| Other non-current assets                                                                                                               | 675             |     | 609     |
| Total assets acquired                                                                                                                  | 7,486           |     | 7,016   |
| Current portion of long-term debt, net                                                                                                 | 1               |     | 1       |
| Accounts payable                                                                                                                       | 145             |     | 145     |
| Contract liabilities                                                                                                                   | 462             |     | 310     |
| Compensation and benefits                                                                                                              | 117             |     | 116     |
| Income taxes payable                                                                                                                   | 3               |     | 6       |
| Other accrued items                                                                                                                    | 613             |     | 278     |
| Long-term debt, net                                                                                                                    | 41              |     | 41      |
| Deferred income taxes                                                                                                                  | 357             |     | 398     |
| Other long-term liabilities                                                                                                            | 1,032           |     | 1,006   |
| Total liabilities assumed                                                                                                              | 2,771           |     | 2,301   |
| Fair value of consideration transferred                                                                                                | 4,715           |     | $ 4,715 |
| **Measurement Period Adjustments, Net**                                                                                                |            |     |    |
| Contract assets                                                                                                                        | (141)           |     |    |
| Other current assets                                                                                                                   | 22              |     |    |
| Property, plant and equipment                                                                                                          | 10              |     |    |
| Goodwill                                                                                                                               | 513             |     |    |
| Other non-current assets                                                                                                               | 66              |     |    |
| Total assets acquired                                                                                                                  | 470             |     |    |
| Contract liabilities                                                                                                                   | 152             |     |    |
| Compensation and benefits                                                                                                              | 1               |     |    |
| Income taxes payable                                                                                                                   | (3)             |     |    |
| Other accrued items                                                                                                                    | 335             |     |    |
| Deferred income taxes                                                                                                                  | (41)            |     |    |
| Other long-term liabilities                                                                                                            | 26              |     |    |
| Total liabilities assumed                                                                                                              | 470             |     |    |
| Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred                    | $ 0             |     |    |

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.
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Amount of increase (decrease) from measurement period adjustment of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 25 -Paragraph 16 -SubTopic 10 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-16
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