INTANGIBLE ASSETS AND GOODWILL - Finite-Lived Intangible Assets Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-lived Intangible Assets Acquired	$ 4	$ 14
Other Depreciation and Amortization	18	20
Finite-lived Intangible Assets [Roll Forward]
Balance at January 1	299	287
Foreign currency translation		(2)
Balance at December 31	303	299
Accumulated Amortization of Intangible Assets [Roll Forward]
Balance at January 1	223	205
Foreign currency translation	2	(2)
Balance at December 31	$ 243	$ 223