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DEBT (Tables)
12 Months Ended
Dec. 31, 2022
Long-Term Debt, Unclassified [Abstract]  
Debt
The following table sets forth our consolidated debt for as of the dates indicated:
December 31,
2022
December 31,
2021
(Thousands of dollars)
Commercial paper outstanding (a)$ $— 
Senior unsecured obligations:
$900,000 at 3.375% due October 2022
 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 
$750,000 at 6.1% due November 2032
750,000 — 
$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
672,530 672,530 
$500,000 at 4.5% due March 2050
443,015 443,015 
$300,000 at 7.15% due January 2051
300,000 300,000 
Guardian
$120,000 term loan, rate of 4.06% as of December 31, 2022, due June 2025
120,000 — 
Total debt13,730,895 13,756,709 
Unamortized portion of terminated swaps9,878 11,596 
Unamortized debt issuance costs and discounts(119,939)(124,855)
Current maturities of long-term debt (925,000)(895,814)
Long-term debt$12,695,834 $12,747,636 
(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 payments on debt as of December 31, 2022, for the years 2023 through 2027 are shown below:
Senior
Unsecured
Obligations
Guardian Interest
Obligations
on Debt
Total
 (Millions of dollars)
2023$925.0 $— $675.1 $1,600.1 
2024$500.0 $— $630.4 $1,130.4 
2025$887.0 $120.0 $599.3 $1,606.3 
2026$600.0 $— $554.5 $1,154.5 
2027$500.0 $— $544.7 $1,044.7