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LEGAL PROCEEDINGS AND CONTINGENCIES (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 24, 2017 | Dec. 31, 2016 | Apr. 24, 2009
Loss Contingencies [Line Items] |  |  |  |
Damages sought by plaintiff |  | $ 52 |  |
Liabilities recorded relative to environmental matters |  | 952 | $ 1,000 |
Environmental costs eligible for future recovery |  | $ 825 | 870 |
Period over which costs and recovery of costs is projected |  | 20 years |  |
Outstanding letters of credit, surety bonds, and third-party guarantees |  | $ 3,300 | 3,700 |
Third-party guarantees |  | $ 726 | $ 709 |
Guarantees of contractual performance of joint ventures (as a percent) |  | 60.00% | 56.00% |
United Launch Alliance |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Ownership interest of ULA (as a percent) |  | 50.00% |  |
N.Y. Metropolitan Transportation Authority |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages sought by plaintiff |  | $ 190 |  |
Contract value |  |  |  | $ 323
Contract payments received to date |  | 241 |  |
Claims for monetary damages against the plaintiff |  | 95 |  |
Period of bench trial | 35 days |  |  |
United Launch Alliance |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Inventory supply agreement |  | $ 120 |  |

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