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DEBT (Tables) | 12 Months Ended
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Dec. 31, 2019
Long-term Debt, Unclassified [Abstract] |
Debt | The following table sets forth our consolidated debt for the periods indicated:
|  | December 31, 2019 |  | December 31, 2018
|  | (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: |  |  |  |
$500,000 at 8.625% due March 2019 |  | — |  |  | 500,000 |
$300,000 at 3.8% due March 2020 |  | — |  |  | 300,000 |
$1,500,000 term loan, rate of 2.70% and 3.63% as of December 31, 2019 and 2018, respectively, due November 2021 |  | 1,250,000 |  |  | 550,000 |
$700,000 at 4.25% due February 2022 |  | 547,397 |  |  | 547,397 |
$900,000 at 3.375 % due October 2022 |  | 900,000 |  |  | 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 at 4.9 % due March 2025 |  | 500,000 |  |  | 500,000 |
$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 |  |  | — |
$750,000 at 3.4% due September 2029 |  | 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 |  | 700,000 |  |  | 700,000 |
$1,000,000 at 5.2% due July 2048 |  | 1,000,000 |  |  | 450,000 |
$750,000 at 4.45% due September 2049 |  | 750,000 |  |  | — |
Guardian Pipeline |  |  |  |
Weighted average 7.85% due December 2022 |  | 21,307 |  |  | 28,957 |
Total debt |  | 12,813,704 |  |  | 9,451,354 |
Unamortized portion of terminated swaps |  | 15,032 |  |  | 16,750 |
Unamortized debt issuance costs and discounts |  | (121,329 | ) |  | (87,120 | )
Current maturities of long-term debt |  | (7,650 | ) |  | (507,650 | )
Short-term borrowings (a) |  | (220,000 | ) |  | — |
Long-term debt |  | $ | 12,479,757 |  |  | $ | 8,873,334 |
(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, 2019, for the years 2020 through 2024 are shown below:
|  | Senior Unsecured Obligations |  | Guardian Pipeline |  | Total
|  | (Millions of dollars)
2020 |  | $ | — |  |  | $ | 7.7 |  |  | $ | 7.7 |
2021 |  | $ | 1,250.0 |  |  | $ | 7.7 |  |  | $ | 1,257.7 |
2022 |  | $ | 1,447.4 |  |  | $ | 5.9 |  |  | $ | 1,453.3 |
2023 |  | $ | 925.0 |  |  | $ | — |  |  | $ | 925.0 |
2024 |  | $ | 500.0 |  |  | $ | — |  |  | $ | 500.0 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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