DEBT (Tables)

12 Months Ended

Dec. 31, 2017

Long-term Debt, Unclassified [Abstract]

Debt

The following table sets forth our consolidated debt for the periods indicated:

	December 31, 2017			December 31, 2016
	(Thousands of dollars)
ONEOK
Commercial paper outstanding, bearing a weighted-average interest rate of 2.23% (a)	$	614,673		$	—
Senior unsecured obligations:
$700,000 at 4.25% due February 2022	547,397			547,397
$500,000 at 7.5% due September 2023	500,000			500,000
$500,000 at 4.0% due July 2027	500,000			—
$100,000 at 6.5% due September 2028	—			87,126
$100,000 at 6.875% due September 2028	100,000			100,000
$400,000 at 6.0% due June 2035	400,000			400,000
$700,000 at 4.95% due July 2047	700,000			—
ONEOK Partners
Commercial paper outstanding (a)	—			1,110,277
Senior unsecured obligations:
$400,000 at 2.0% due October 2017	—			400,000
$425,000 at 3.2% due September 2018	425,000			425,000
$1,000,000 term loan, at 2.87% and 2.04%, respectively, due January 2019 (b)	500,000			1,000,000
$500,000 at 8.625% due March 2019	500,000			500,000
$300,000 at 3.8% due March 2020	300,000			300,000
$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 4.9 % due March 2025	500,000			500,000
$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
Guardian Pipeline
Weighted average 7.85% due December 2022	36,607			44,257
Total debt	9,198,677			9,489,057
Unamortized portion of terminated swaps	18,468			20,186
Unamortized debt issuance costs and discounts	(78,193		)	(68,320		)
Current maturities of long-term debt	(432,650		)	(410,650		)
Short-term borrowings (c)	(614,673		)	(1,110,277		)
Long-term debt	$	8,091,629		$	7,919,996

(a) - In July 2017, the commercial paper outstanding under the ONEOK Partners commercial paper program was repaid as it matured with a combination of proceeds from new issuances from ONEOK’s recently established $2.5 billion commercial paper program, cash on hand and proceeds from our July 2017 $1.2 billion senior notes issuance. The $2.4 billion ONEOK Partners commercial paper program was terminated in July 2017.

(b) - The remaining $500 million of the Term Loan Agreement was repaid in January 2018.

(c) - 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 the $2.5 Billion Credit Agreement.

Aggregate maturities of long-term debt outstanding

The aggregate maturities of long-term debt outstanding as of December 31, 2017, for the years 2018 through 2022 are shown below:

	Senior Notes		Guardian Pipeline		Total
2018	$	425.0	$	7.7	$	432.7
2019 (a)	$	1,000.0	$	7.7	$	1,007.7
2020	$	300.0	$	7.7	$	307.7
2021	$	—	$	7.7	$	7.7
2022	$	1,447.4	$	5.8	$	1,453.2

(a) $500 million of the $1.0 billion maturing in 2019 relates to the Term Loan Agreement, which was repaid in January 2018.