COMPREHENSIVE INCOME (LOSS) - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 5,063	$ 5,034	$ 4,890	$ 4,935	$ 4,720	$ 4,608	$ 4,649	$ 5,048
Foreign Currency Translation Gain (Loss)
Derivative [Line Items]
Foreign currency tax adjustment	182			216
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(317)	$ (249)	$ (286)	(187)	$ (330)	$ (414)	$ (489)	$ (370)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest, Translation Gain (Loss)
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(113)			(25)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest, Net Investment Hedges
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (204)			$ (162)