LEGAL PROCEEDINGS AND CONTINGENCIES (Details) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 24, 2009 USD ($)	Jun. 30, 2006 subsidiary	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	May 31, 2017 lawsuit
Loss Contingencies [Line Items]
Damages sought by plaintiff			$ 52
Liabilities recorded relative to environmental matters			$ 677	$ 680
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]			Other noncurrent liabilities	Other noncurrent liabilities
Environmental costs eligible for future recovery			$ 611	$ 613
Period over which costs and recovery of costs is projected (in years)			20 years
Outstanding letters of credit, surety bonds, and third-party guarantees			$ 2,700	2,900
Third-party guarantees			$ 364	$ 1,000
Guarantees of contractual performance of joint ventures (as percent)			29.00%	75.00%
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
Sikorsky Aircraft Corporation
Loss Contingencies [Line Items]
Number of pending claims | lawsuit					2
Number of entities involved in litigation | subsidiary		2