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LONG-TERM DEBT - Components of Notes Payable (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Notes payable $ 370 $ 392
Deferred loan costs 0 (1)
Less: current portion (22) (22)
Long-term debt, noncurrent $ 348 $ 369
Annual Contractual Interest Rate 1.77% 3.42%
Effective Interest Rate 1.87% 3.52%
Notes Payable | 2018 Term Loan A    
Line of Credit Facility [Line Items]    
Notes payable $ 370 $ 392