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LEGAL PROCEEDINGS AND CONTINGENCIES (Details) $ in Millions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 16, 2016 USD ($) | Dec. 31, 2014 | Sep. 29, 2019 USD ($) subsidiary | Dec. 31, 2018 USD ($) | Dec. 31, 2016 | May 31, 2017 lawsuit | Apr. 24, 2009 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Damages sought by plaintiff |  |  | $ 52 |  |  |  |
Liabilities recorded relative to environmental matters |  |  | 828 | $ 864 |  |  |
Environmental costs eligible for future recovery |  |  | $ 719 | 750 |  |  |
Period over which costs and recovery of costs is projected |  |  | 20 years |  |  |  |
Outstanding letters of credit, surety bonds, and third-party guarantees |  |  | $ 3,600 | 3,600 |  |  |
Third-party guarantees |  |  | $ 1,100 | $ 850 |  |  |
Guarantees of contractual performance of joint ventures (as a percent) |  |  | 71.00% | 65.00% |  |  |
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 |  |  |  |  |
Leidos Holdings, Inc. |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Reserve transferred | $ 38 |  |  |  |  |  |
Indemnification percent, up to maximum reserve |  |  |  |  | 100.00% |  |
Maximum reserve | $ 64 |  |  |  |  |  |
Indemnification percent in excess of maximum reserve |  |  |  |  | 50.00% |  |
Sikorsky Aircraft Corporation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of pending claims | lawsuit |  |  |  |  |  | 2 |
Number of entities involved in litigation | subsidiary |  |  | 2 |  |  |  |

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