DEBT AND CREDIT FACILITIES (Tables)

12 Months Ended

Dec. 31, 2016

DEBT AND CREDIT FACILITIES

Schedule of debt and credit facilities

(unaudited) (millions of dollars)		December 31, 2016	Weighted Average Interest Rate for the Year Ended December 31, 2016		December 31, 2015	Weighted Average Interest Rate for the Year Ended December 31, 2015
TC PipeLines, LP
	Senior Credit Facility due 2021	160	1.72%		200	1.44%
	2013 Term Loan Facility due 2018	500	1.73%		500	1.44%
	2015 Term Loan Facility due 2018	170	1.63%		170	1.47%
	4.65% Unsecured Senior Notes due 2021	350	4.65%	(b)	350	4.65%	(b)
	4.375% Unsecured Senior Notes due 2025	350	4.375%	(b)	350	4.375%	(b)
GTN
	5.29% Unsecured Senior Notes due 2020	100	5.29%	(b)	100	5.29%	(b)
	5.69% Unsecured Senior Notes due 2035	150	5.69%	(b)	150	5.69%	(b)
	Unsecured Term Loan Facility due 2019	65	1.43%		75	1.15%
Tuscarora
	Unsecured Term Loan due 2019	10	1.64%		–	–
	3.82% Series D Senior Notes due 2017	12	3.82%	(b)	16	3.82%	(b)
		1,867			1,911
Less: unamortized debt issuance costs and debt discount(a)		9			8
Less: current portion		23			14
		1,835			1,889

(a)	As a result of the application of ASU No. 2015-03 and similar to the presentation of debt discounts, debt issuance costs of $7 million at December 31, 2015 previously reported as other assets in the balance sheet were reclassified as an offset against debt. Refer to Note 3, Accounting Pronouncements.
(b)	Fixed interest rate.

Schedule of principal repayments required on debt

(millions of dollars)
2017	23
2018	691
2019	43
2020	100
2021	510
Thereafter	500
	1,867