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FAIR VALUE MEASUREMENTS - Assets Measured on Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840 + Details
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