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DEBT DEBT (Tables)
9 Months Ended
Sep. 30, 2021
Debt Instrument [Line Items]  
Debt [Table Text Block]
The following table sets forth our consolidated debt for the periods indicated:
September 30,
2021
December 31,
2020
 
(Thousands of dollars)
Commercial paper outstanding$ $— 
Senior unsecured obligations:
$700,000 at 4.25% due February 2022
536,107 541,877 
$900,000 at 3.375% due October 2022
895,814 895,814 
$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
387,000 387,000 
$600,000 at 5.85% due January 2026
600,000 600,000 
$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
714,251 714,251 
$850,000 at 3.1% due March 2030
780,093 780,093 
$600,000 at 6.35% due January 2031
600,000 600,000 
$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
689,006 689,006 
$1,000,000 at 5.2% due July 2048
1,000,000 1,000,000 
$750,000 at 4.45% due September 2049
672,530 713,676 
$500,000 at 4.5% due March 2050
443,015 451,270 
$300,000 at 7.15% due January 2051
300,000 300,000 
Guardian Pipeline
Weighted average 7.85% due December 2022
 13,657 
Total debt14,292,816 14,361,644 
Unamortized portion of terminated swaps12,025 13,314 
Unamortized debt issuance costs and discounts(128,267)(138,887)
Current maturities of long-term debt (536,107)(7,650)
Long-term debt$13,640,467 $14,228,421