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DEBT (Tables)
 12 Months Ended
Dec. 31, 2020
Long-term Debt, Unclassified [Abstract]  
Debt
The following table sets forth our consolidated debt for the periods indicated:
December 31,
2020		December 31,
2019
(Thousands of dollars)
Commercial paper outstanding, bearing a weighted-average interest rate of 2.16% as of December 31, 2019
$— $220,000 
Senior unsecured obligations:
$1,500,000 term loan at 2.70% as of December 31, 2019, due November 2021
— 1,250,000 
$700,000 at 4.25% due February 2022
541,877 547,397 
$900,000 at 3.375% due October 2022
895,814 900,000 
$425,000 at 5.0% due September 2023
425,000 425,000 
$500,000 at 7.5% due September 2023
500,000 500,000 
$500,000 at 2.75% due September 2024
500,000 500,000 
$500,000 at 4.9% due March 2025
500,000 500,000 
$400,000 at 2.2% due September 2025
387,000 — 
$600,000 at 5.85% due January 2026
600,000 — 
$500,000 at 4.0% due July 2027
500,000 500,000 
$800,000 at 4.55% due July 2028
800,000 800,000 
$100,000 at 6.875% due September 2028
100,000 100,000 
$700,000 at 4.35% due March 2029
700,000 700,000 
$750,000 at 3.4% due September 2029
714,251 750,000 
$850,000 at 3.1% due March 2030
780,093 — 
$600,000 at 6.35% due January 2031
600,000 — 
$400,000 at 6.0% due June 2035
400,000 400,000 
$600,000 at 6.65% due October 2036
600,000 600,000 
$600,000 at 6.85% due October 2037
600,000 600,000 
$650,000 at 6.125% due February 2041
650,000 650,000 
$400,000 at 6.2% due September 2043
400,000 400,000 
$700,000 at 4.95% due July 2047
689,006 700,000 
$1,000,000 at 5.2% due July 2048
1,000,000 1,000,000 
$750,000 at 4.45% due September 2049
713,676 750,000 
$500,000 at 4.5% due March 2050
451,270 — 
$300,000 at 7.15% due January 2051
300,000 — 
Guardian Pipeline
Weighted average 7.85% due December 2022
13,657 21,307 
Total debt14,361,644 12,813,704 
Unamortized portion of terminated swaps13,314 15,032 
Unamortized debt issuance costs and discounts(138,887)(121,329)
Current maturities of long-term debt (7,650)(7,650)
Short-term borrowings (a) — (220,000)
Long-term debt$14,228,421 $12,479,757 
(a) - Individual issuances of commercial paper under our commercial paper program generally mature in 90 days or less.
Aggregate maturities of long-term debt outstanding The aggregate maturities of long-term debt outstanding as of December 31, 2020, for the years 2021 through 2025 are shown below:
Senior
Unsecured
Obligations		Guardian
Pipeline		Total
 (Millions of dollars)
2021$— $7.7 $7.7 
2022$1,437.7 $6.0 $1,443.7 
2023$925.0 $— $925.0 
2024$500.0 $— $500.0 
2025$887.0 $— $887.0