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Note 4 - Long-term Debt - Long-term Debt Summary (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Long-term debt, gross | $ 4,035 | $ 3,760
Long-term debt, less deferred financing costs | 3,974 | 3,697
Borrowing availability under Revolving Credit Facility | 200 | 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
2024 Notes [Member] |  |
Long-term debt, gross | 0 | 525
Unamortized deferred loan costs | 0 | (5)
2026 Notes [Member] |  |
Long-term debt, gross | 700 | 700
Unamortized deferred loan costs | (6) | (7)
Unamortized premium | 3 | 4
2027 Notes [Member] |  |
Long-term debt, gross | 750 | 750
Unamortized deferred loan costs | (10) | (11)
2030 Notes [Member] |  |
Long-term debt, gross | 800 | 0
Unamortized deferred loan costs | (14) | 0
The 2019 Senior Credit Facility [Member] |  |
Long-term debt, gross | 1,785 |
Unamortized deferred loan costs | $ (34) | $ (44)

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