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Note 4 - Long-term Debt - Long-term Debt Summary (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Long-term debt, gross | $ 4,035 | $ 4,035
Unamortized premium | 3 | 3
Long-term debt, less current portion and deferred financing costs | 3,976 | 3,974
Borrowing availability under 2019 Revolving Credit Facility | 299 | 200
The 2017 Term Loan [Member] |  |
Long-term debt, gross | 595 | 595
The 2019 Term Loan [Member] |  |
Long-term debt, gross | 1,190 | 1,190
2026 Notes [Member] |  |
Long-term debt, gross | 700 | 700
Unamortized deferred loan costs | (6) | (6)
2027 Notes [Member] |  |
Long-term debt, gross | 750 | 750
Unamortized deferred loan costs | (10) | (10)
2030 Notes [Member] |  |
Long-term debt, gross | 800 | 800
Unamortized deferred loan costs | (13) | (14)
The 2019 Senior Credit Facility [Member] |  |
Long-term debt, gross | 1,785 |
Unamortized deferred loan costs | $ (33) | $ (34)

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