DEBT AND CREDIT FACILITIES (Tables)

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Schedule of debt and credit facilities

(unaudited) (millions of dollars)	March 31, 2020	Weighted Average Interest Rate for the Three Months Ended March 31, 2020		December 31, 2019	Weighted Average Interest Rate for the Year Ended  December 31, 2019
TC PipeLines, LP
Senior Credit Facility due 2021	—	—		—	—
2013 Term Loan Facility due 2022	450	2.93%		450	3.52%
4.65% Unsecured Senior Notes due 2021	350	4.65%	(a)	350	4.65%	(a)
4.375% Unsecured Senior Notes due 2025	350	4.375%	(a)	350	4.375%	(a)
3.90 % Unsecured Senior Notes due 2027	500	3.90%	(a)	500	3.90%	(a)
GTN
5.29% Unsecured Senior Notes due 2020	100	5.29%	(a)	100	5.29%	(a)
5.69% Unsecured Senior Notes due 2035	150	5.69%	(a)	150	5.69%	(a)
PNGTS
Revolving Credit Facility due 2023	45	2.92%		39	3.47%
Tuscarora
Unsecured Term Loan due 2020	23	2.80%		23	3.39%
North Baja
Unsecured Term Loan due 2021	50	2.75%		50	3.34%
	2,018			2,012
Less: unamortized debt issuance costs and debt discount	8			9
Less: current portion	123			123
	1,887			1,880

^(a)       Fixed interest rate

Schedule of principal repayments required on debt

The principal repayments required of the Partnership on its debt are as follows:

(unaudited)
(millions of dollars)	Principal Payments
2020	123
2021	400
2022	450
2023	45
2024	—
Thereafter	1,000
	2,018