FAIR VALUE MEASUREMENTS - Financial Instruments at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Cash	$ 237	$ 297
Short-term investments	268	271
Net derivative contracts	44	41
Contingent consideration from acquisition of Green Motion	(57)	(57)
Level 1
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Cash	237	297
Short-term investments	268	271
Net derivative contracts	0	0
Contingent consideration from acquisition of Green Motion	0	0
Level 2
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Cash	0	0
Short-term investments	0	0
Net derivative contracts	44	41
Contingent consideration from acquisition of Green Motion	0	0
Level 3
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Cash	0	0
Short-term investments	0	0
Net derivative contracts	0	0
Contingent consideration from acquisition of Green Motion	$ (57)	$ (57)