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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair Value Measurements on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | $ 538 | $ 451
Total | 2,276 | 2,094
Fair Value Measurements on a Recurring Basis |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents: | 25 | 13
Investments: | 303 | 195
Restricted cash equivalents: | 94 | 99
Restricted investments: | 235 | 256
Total | 657 | 563
Fair Value Measurements on a Recurring Basis | Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 49 | 24
Fair Value Measurements on a Recurring Basis | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 137 | 93
Restricted investments: | 30 | 35
Fair Value Measurements on a Recurring Basis | U.S. government agencies and government-sponsored agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 2 | 5
Restricted investments: | 15 | 23
Fair Value Measurements on a Recurring Basis | U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 106 | 67
Restricted investments: | 179 | 198
Fair Value Measurements on a Recurring Basis | Certificate of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Restricted cash equivalents: | 1 |
Restricted investments: | 11 |
Fair Value Measurements on a Recurring Basis | Other debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 9 | 6
Fair Value Measurements on a Recurring Basis | Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents: | 4 | 2
Investments: | 0 | 0
Restricted cash equivalents: | 93 | 99
Restricted investments: | 0 | 0
Total | 97 | 101
Fair Value Measurements on a Recurring Basis | Level 1 | Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 0 | 0
Fair Value Measurements on a Recurring Basis | Level 1 | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 0 | 0
Restricted investments: | 0 | 0
Fair Value Measurements on a Recurring Basis | Level 1 | U.S. government agencies and government-sponsored agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 0 | 0
Restricted investments: | 0 | 0
Fair Value Measurements on a Recurring Basis | Level 1 | U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 0 | 0
Restricted investments: | 0 | 0
Fair Value Measurements on a Recurring Basis | Level 1 | Certificate of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Restricted investments: | 0 |
Fair Value Measurements on a Recurring Basis | Level 1 | Other debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 0 | 0
Fair Value Measurements on a Recurring Basis | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents: | 21 | 11
Investments: | 303 | 195
Restricted cash equivalents: | 1 | 0
Restricted investments: | 235 | 256
Total | 560 | 462
Fair Value Measurements on a Recurring Basis | Level 2 | Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 49 | 24
Fair Value Measurements on a Recurring Basis | Level 2 | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 137 | 93
Restricted investments: | 30 | 35
Fair Value Measurements on a Recurring Basis | Level 2 | U.S. government agencies and government-sponsored agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 2 | 5
Restricted investments: | 15 | 23
Fair Value Measurements on a Recurring Basis | Level 2 | U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 106 | 67
Restricted investments: | 179 | 198
Fair Value Measurements on a Recurring Basis | Level 2 | Certificate of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Restricted investments: | 11 |
Fair Value Measurements on a Recurring Basis | Level 2 | Other debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments: | 9 | 6
Money market mutual funds | Fair Value Measurements on a Recurring Basis |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents: | 4 | 2
Money market mutual funds | Fair Value Measurements on a Recurring Basis | Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents: | 4 | 2
Money market mutual funds | Fair Value Measurements on a Recurring Basis | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents: | 0 | 0
U.S. treasuries | Fair Value Measurements on a Recurring Basis |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents: | 21 | 11
U.S. treasuries | Fair Value Measurements on a Recurring Basis | Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents: | 0 | 0
U.S. treasuries | Fair Value Measurements on a Recurring Basis | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents: | 21 | $ 11
Certificate of deposit | Fair Value Measurements on a Recurring Basis | Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Restricted cash equivalents: | 0 |
Certificate of deposit | Fair Value Measurements on a Recurring Basis | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Restricted cash equivalents: | $ 1 |

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