INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	29.50%	(13.20%)
Income Tax Contingency [Line Items]
Tax expense recorded resulting from the U.S. tax reform	$ (79)		$ 4,512
Transition tax on historic foreign earnings			1,155
Revaluation of deferred taxes	55		3,357
Tax benefit related to non-consolidated operations	$ 134
GE
Income Tax Contingency [Line Items]
Transition tax on historic foreign earnings			2,925
Revaluation of deferred taxes			1,980
GE Capital
Income Tax Contingency [Line Items]
Transition tax on historic foreign earnings			(1,770)
Revaluation of deferred taxes			$ 1,377