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LONG-TERM DEBT (Tables)
9 Months Ended
Sep. 30, 2020
Long-term Debt and Lease Obligation [Abstract]  
Summary of long-term debt
The table below shows our long-term debt at September 30, 2020 and December 31, 2019:
 September 30, 2020December 31, 2019
Senior unsecured notes:    
8.125% due 2022
$— $2,800 
6.750% due 2023
1,872 1,872 
7.000% due 2025
478 478 
6.125% due 2028
2,500 — 
6.875% due 2031
362 362 
Senior secured first lien notes:  
4.625% due 2024
1,870 1,870 
4.625% due 2024
600 600 
7.500% due 2025
700 — 
4.875% due 2026
2,100 2,100 
5.125% due 2027
1,500 1,500 
4.625% due 2028
600 — 
Senior secured second lien notes:
5.125% due 2025
1,410 1,410 
6.250% due 2027
1,500 1,500 
Finance leases and mortgage notes408 445 
Unamortized issue costs and note discounts(184)(186)
Total long-term debt15,716 14,751 
Less current portion155 171 
Long-term debt, net of current portion$15,561 $14,580