GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets - Net, Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 428	$ 496	$ 1,076	$ 1,220
Non-cash pre-tax impairment charge	113	$ 103	$ 113	$ 103
Power
Acquired Finite-Lived Intangible Assets [Line Items]
Non-cash pre-tax impairment charge	$ 113