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DEBT DEBT (Tables) | 6 Months Ended
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Jun. 30, 2020
Debt Instrument [Line Items] |
Debt [Table Text Block] | The following table sets forth our consolidated debt for the periods indicated:
|  | June 30, 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 |  | 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 |
$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 |  | 737,736 |  |  | 750,000 |
$500,000 at 4.5% due March 2050 |  | 467,625 |  |  | — |
$300,000 at 7.15% due January 2051 |  | 300,000 |  |  | — |
Guardian Pipeline |  |  |  |  |  |
Weighted average 7.85% due December 2022 |  | 17,482 |  |  | 21,307 |
Total debt |  | 14,415,590 |  |  | 12,813,704 |
Unamortized portion of terminated swaps |  | 14,173 |  |  | 15,032 |
Unamortized debt issuance costs and discounts |  | (145,881 | ) |  | (121,329 | )
Current maturities of long-term debt |  | (7,650 | ) |  | (7,650 | )
Short-term borrowings (a) |  | — |  |  | (220,000 | )
Long-term debt |  | $ | 14,276,232 |  |  | $ | 12,479,757 |
(a) - Individual issuances of commercial paper under our commercial paper program generally mature in 90 days or less.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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