GOODWILL, INTANGIBLE ASSETS AND OTHER LONG-LIVED ASSETS - Goodwill (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Roll Forward]
Balance, December 31, 2019	[1]			$ 2,913
Goodwill impairment charge		$ (573)	$ 0	(1,062)	$ 0
Foreign currency translation adjustments				14
Balance, September 30, 2020	[1]	$ 1,865		$ 1,865

[1] (1) The balance of goodwill as of September 30, 2020 and December 31, 2019 is stated net of cumulative impairment charges of $2.0 billion and $941 million, respectively.