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LONG-TERM DEBT
 12 Months Ended
Dec. 31, 2020
Line of Credit Facility [Abstract]  
LONG-TERM DEBT LONG-TERM DEBT AND REVOLVING CREDIT AGREEMENT BORROWINGS
As of December 31, 2020 and 2019, long-term debt consisted of the following:
(in millions)December 31,
2020		December 31,
2019
2018 Term Loan A370 392 
Total term loans370 392 
Deferred loan costs— (1)
Less: current portion(22)(22)
Long-term debt, noncurrent$348 $369 
Annual contractual interest rate1.77 %3.42 %
Effective interest rate1.87 %3.52 %
In June 2018 we entered into a $425 million term loan A (our 2018 Term Loan) under our credit agreement (2018 Credit Agreement). The proceeds of the 2018 Term Loan were used to repay our previously outstanding term loans.
The 2018 Credit Agreement includes a $250 million revolving credit facility (our 2018 Revolver), which could be used solely for working capital and other general corporate purposes. The 2018 Revolver includes capacity for a $20 million swingline facility. Letters of credit issued pursuant to the revolving credit facility reduce the amount available for borrowing under the 2018 Revolver. At December 31, 2020, we had $16 million of letters of credit outstanding and remaining capacity of 234 million under the 2018 Revolver.
Interest on our 2018 Term Loan is payable quarterly and is variable based on LIBOR plus 1.625% or the prime rate plus 0.625%, at our option, subject to certain rate adjustments based upon our total leverage ratio. At December 31, 2020, the interest rates were based on LIBOR plus 1.625%. We are required to pay a quarterly commitment fee on the daily unused amount of the commitments under our 2018 Revolver, as well as fronting fees and other customary fees for letters of credit issued under our 2018 Revolver, which is subject to adjustments based on our total leverage ratio.
Borrowings under our 2018 Term Loan and 2018 Revolver are secured by substantially all of our assets, other than excluded assets as defined in our 2018 Credit Agreement, which includes certain customary assets, assets held in trusts as collateral and WSE related assets.
We are permitted to make voluntary prepayments at any time without payment of a premium. We are required to make mandatory prepayments of term loans (without payment of a premium) with (i) net cash proceeds from issuances of debt (other than certain permitted debt), and (ii) net cash proceeds from certain non-ordinary course asset sales and casualty and condemnation proceeds (subject to reinvestment rights and other exceptions).
The 2018 Credit Agreement contains certain financial covenants and restrictive covenants customary for facilities of this type, including restrictions on indebtedness, liens, investments, mergers, dispositions, prepayment of indebtedness (other than our 2018 Term Loan and our 2018 Revolver), dividends, distributions and transactions with affiliates, as well as minimum interest coverage and maximum total leverage ratio requirements. We were in compliance with all financial covenants under the credit facilities at December 31, 2020.
The remaining balance of our 2018 Term Loan will be repaid in quarterly installments in aggregate annual amounts as follows:
Year ending December 31,
(in millions)20212022202320242025Thereafter
Term loan repayments$22 $22 $326 $— $— $—