RELATED PARTY TRANSACTIONS (Tables)

12 Months Ended

Dec. 31, 2017

RELATED PARTY TRANSACTIONS

Summary of capital and operating costs charged to pipeline systems by related party

Year ended December 31 (millions of dollars)		2017	2016	2015
Capital and operating costs charged by TransCanada's subsidiaries to:
	Great Lakes(a)	36	30	30
	Northern Border(a)	43	32	36
	PNGTS(a)(b)	9	8	8
	GTN(a)(c)	34	27	30
	Bison	6	2	4
	North Baja	4	4	5
	Tuscarora	4	5	4
Impact on the Partnership's net income attributable to controlling interests:
	Great Lakes	15	13	13
	Northern Border	16	12	14
	PNGTS(b)	5	5	5
	GTN(c)	29	24	25
	Bison	6	3	4
	North Baja	4	4	5
	Tuscarora	4	4	4

Summary of amount payable to related party for costs charged

December 31 (millions of dollars)		2017	2016
Amount payable to TransCanada's subsidiaries for costs charged in the year by:
	Great Lakes(a)	3	4
	Northern Border(a)	4	4
	PNGTS(a)(b)	1	1
	GTN	3	3
	Bison	1	1
	North Baja	–	1
	Tuscarora	–	1

(a)	Represents 100 percent of the costs.
(b)	Recast to consolidate PNGTS for years ended December 31, 2016 and 2015 (Refer to Note 2).
(c)	In 2015, the Partnership acquired the remaining 30 percent interest in GTN (Refer to Note 7).