CONTRACT & OTHER DEFERRED ASSETS AND PROGRESS COLLECTIONS & DEFERRED INCOME - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Contractors [Abstract]
Revenue recognized included in contract liability	$ 5,173	$ 5,593
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase in contract and other deferred assets	140
Power and Renewable Energy
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Decrease in progress collections and deferred income due to timing of revenue recognition	364
Revisions | Adjustment Due to Change in Estimated Profitability
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in gross profit	150
Services
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase in contract and other deferred assets	140
Equipment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase in contract and other deferred assets	$ 155