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LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Less: current portion | $ (24) | $ 0
Long-Term Debt | 1,393 | 22
Other Long-Term Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt | 18 | 22
Term Loan F Due 2027 | Secured Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt | 516 | 0
Unamortized debt issuance costs | 4 |
Term Loan B Due 2028 | Secured Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 441 | 0
Debt Instrument, interest rate, stated percentage | 4.50% |
Unamortized debt issuance costs | $ 5 |
Unamortized original issue discount | 5 |
Seven Percent Senior Notes Due 2029 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 442 | $ 0
Debt Instrument, interest rate, stated percentage | 7.00% |
Unamortized debt issuance costs | $ 8 |

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