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RELATED PARTY TRANSACTIONS (Tables)
 12 Months Ended
Dec. 31, 2020
Related Party Transactions [Abstract]  
Summary of capital and operating costs charged to pipeline systems by related party
Capital and operating costs charged to our pipeline systems, except for Iroquois, for the years ended December 31, 2020, 2019 and 2018 by TC Energy's subsidiaries and amounts payable to TC Energy's subsidiaries at December 31, 2020 and 2019 are summarized in the following tables:
Year ended December 31 (millions of dollars)
202020192018
Capital and operating costs charged by TC Energy’s subsidiaries to:
Great Lakes (a)
66 47 44 
Northern Border(a)
39 39 36 
PNGTS (a)
6 7 9 
GTN68 45 34 
Bison2 2 6 
North Baja7 5 4 
Tuscarora6 4 4 
Impact on the Partnership’s net income attributable to controlling interests:
Great Lakes16 20 19 
Northern Border16 18 16 
PNGTS3 4 5 
GTN29 33 28 
Bison2 2 6 
North Baja3 4 4 
Tuscarora3 4 4 
Summary of amount payable to related party for costs charged
December 31 (millions of dollars)
20202019
Amount payable to TC Energy’s subsidiaries for costs charged in the year by:
Great Lakes (a)
3 5 
Northern Border(a)
2 4 
PNGTS (a)
1 1 
GTN4 5 
Bison— — 
North Baja— 1 
Tuscarora1 — 
(a)Represents 100 percent of the costs.