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DEBT (Tables)
12 Months Ended
Dec. 31, 2021
Long-term Debt, Unclassified [Abstract]  
Debt
The following table sets forth our consolidated debt for the periods indicated:
December 31,
2021
December 31,
2020
(Thousands of dollars)
Commercial paper outstanding$ $— 
Senior unsecured obligations:
$700,000 at 4.25% due February 2022
 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 debt13,756,709 14,361,644 
Unamortized portion of terminated swaps11,596 13,314 
Unamortized debt issuance costs and discounts(124,855)(138,887)
Current maturities of long-term debt (895,814)(7,650)
Short-term borrowings (a)  — 
Long-term debt$12,747,636 $14,228,421 
(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 and interest obligations on debt as of December 31, 2021, for the years 2022 through 2026 are shown below:
Senior
Unsecured
Obligations
Interest
Obligations
on Debt
Total
 (Millions of dollars)
2022$895.8 $670.5 $1,566.3 
2023$925.0 $629.3 $1,554.3 
2024$500.0 $584.6 $1,084.6 
2025$887.0 $553.6 $1,440.6 
2026$600.0 $508.8 $1,108.8