GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
Net goodwill, beginning of period	$ 13,938
Net goodwill, end of period	14,047
Corporate, Non-Segment [Member]
Goodwill [Roll Forward]
Net goodwill, beginning of period	13,938
Foreign currency impact	109
Net goodwill, end of period	$ 14,047