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DEBT DEBT (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Instrument [Line Items] |
Debt [Table Text Block] | The following table sets forth our consolidated debt for the periods indicated:
|  | September 30, 2018 |  | December 31, 2017
|  | (Thousands of dollars)
Commercial paper outstanding, bearing a weighted-average interest rate of 2.85% and 2.23% as of September 30, 2018, and December 31, 2017, respectively. | $ | 120,000 |  |  | $ | 614,673 |
Senior unsecured obligations: |  |  |  |
$425,000 at 3.2% due September 2018 |  | — |  |  | 425,000 |
$1,000,000 term loan, rate of 2.87% as of December 31, 2017, due January 2019 |  | — |  |  | 500,000 |
$500,000 at 8.625% due March 2019 |  | 500,000 |  |  | 500,000 |
$300,000 at 3.8% due March 2020 |  | 300,000 |  |  | 300,000 |
$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 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 |  |  | — |
$100,000 at 6.875% due September 2028 |  | 100,000 |  |  | 100,000 |
$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 |
$450,000 at 5.2% due July 2048 |  | 450,000 |  |  | — |
Guardian Pipeline |  |  |  |
Weighted average 7.85% due December 2022 |  | 30,870 |  |  | 36,607 |
Total debt |  | 9,023,267 |  |  | 9,198,677 |
Unamortized portion of terminated swaps |  | 17,179 |  |  | 18,468 |
Unamortized debt issuance costs and discounts |  | (87,088 | ) |  | (78,193 | )
Current maturities of long-term debt |  | (507,650 | ) |  | (432,650 | )
Short-term borrowings (a) |  | (120,000 | ) |  | (614,673 | )
Long-term debt |  | $ | 8,325,708 |  |  | $ | 8,091,629 |
(a) - Individual issuances of commercial paper under our commercial paper program generally mature in 90 days or less. These issuances are supported by and reduce the borrowing capacity under our $2.5 Billion Credit Agreement.

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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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