FAIR VALUE MEASUREMENTS - Assets Measured on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Summary of financial instruments recognized at fair value and fair value measurement used
Cash	$ 297	$ 438
Short-term investments	271	664
Net derivative contracts	41	31
Contingent consideration from acquisition of Green Motion (Note 2)	(57)
Quoted prices in active markets for identical assets (Level 1)
Summary of financial instruments recognized at fair value and fair value measurement used
Cash	297	438
Short-term investments	271	664
Net derivative contracts	0	0
Contingent consideration from acquisition of Green Motion (Note 2)	0
Other observable inputs (Level 2)
Summary of financial instruments recognized at fair value and fair value measurement used
Cash	0	0
Short-term investments	0	0
Net derivative contracts	41	31
Contingent consideration from acquisition of Green Motion (Note 2)	0
Unobservable inputs (Level 3)
Summary of financial instruments recognized at fair value and fair value measurement used
Cash	0	0
Short-term investments	0	0
Net derivative contracts	0	$ 0
Contingent consideration from acquisition of Green Motion (Note 2)	$ (57)

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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