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RELATED PARTY TRANSACTIONS (Details)
MMBTU / d in Thousands
1 Months Ended 12 Months Ended
Aug. 01, 2020
USD ($)
Sep. 21, 2017
Bcf
Dec. 31, 2020
USD ($)
MMBTU / d
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2020
USD ($)
Capital and operating costs charged to the pipeline systems and amount payable            
Net amounts payable     $ 7,000,000 $ 8,000,000    
Amount included in receivables from related party     1,000,000 0    
General Partner | Reimbursement of costs of services provided            
Capital and operating costs charged to the pipeline systems and amount payable            
Costs charged     4,000,000 4,000,000 $ 4,000,000  
ANR Pipeline Company | Technology-Based Intangible Assets [Member]            
Capital and operating costs charged to the pipeline systems and amount payable            
Finite-lived intangible assets acquired $ 51,000,000          
TC Energy | ANR Pipeline Company | Transportation contracts            
Capital and operating costs charged to the pipeline systems and amount payable            
Contract term   10 years        
Great Lakes | TransCanada's subsidiaries            
Capital and operating costs charged to the pipeline systems and amount payable            
Amount included in receivables from related party     17,000,000 19,000,000    
Great Lakes | TC Energy            
Capital and operating costs charged to the pipeline systems and amount payable            
Net amounts payable     3,000,000 5,000,000    
Great Lakes | TC Energy | Capital and operating costs            
Capital and operating costs charged to the pipeline systems and amount payable            
Costs charged     66,000,000 47,000,000 44,000,000  
Impact on the Partnership's net income attributable to controlling interests     16,000,000 20,000,000 19,000,000  
Amount included in receivables from related party     27,000,000 34,000,000    
Great Lakes | TC Energy | Transportation contracts            
Capital and operating costs charged to the pipeline systems and amount payable            
Revenues     $ 75,000,000 $ 76,000,000 $ 76,000,000  
Great Lakes | TC Energy | Transportation contracts | Total net revenues | Customer concentration risk            
Capital and operating costs charged to the pipeline systems and amount payable            
Percent of total revenues     73.00% 73.00% 73.00%  
Great Lakes | TC Energy | Affiliated rental revenue | Maximum            
Capital and operating costs charged to the pipeline systems and amount payable            
Percent of total revenues       1.00% 1.00%  
Great Lakes | ANR Pipeline Company | Transportation contracts            
Capital and operating costs charged to the pipeline systems and amount payable            
Contract term     20 years   15 years  
Transportation capacity per day | Bcf   0.711        
Total contract value     $ 182,000,000   $ 1,300,000,000  
Contract capacity | MMBTU / d     168      
Contract value terminated           $ 1,100,000,000
Northern Border | TC Energy            
Capital and operating costs charged to the pipeline systems and amount payable            
Net amounts payable     $ 2,000,000 $ 4,000,000    
Northern Border | TC Energy | Capital and operating costs            
Capital and operating costs charged to the pipeline systems and amount payable            
Costs charged     39,000,000 39,000,000 36,000,000  
Impact on the Partnership's net income attributable to controlling interests     16,000,000 18,000,000 16,000,000  
Northern Border | Affiliates | Transportation contracts            
Capital and operating costs charged to the pipeline systems and amount payable            
Amount included in receivables from related party     0 0    
Revenues from related party     800,000 0 0  
PNGTS | TransCanada's subsidiaries | Transportation contracts            
Capital and operating costs charged to the pipeline systems and amount payable            
Amount included in receivables from related party     0 0    
Revenues from related party       1,000,000 1,000,000  
PNGTS | TC Energy            
Capital and operating costs charged to the pipeline systems and amount payable            
Net amounts payable     1,000,000 1,000,000    
PNGTS | TC Energy | Capital and operating costs            
Capital and operating costs charged to the pipeline systems and amount payable            
Costs charged     6,000,000 7,000,000 9,000,000  
Impact on the Partnership's net income attributable to controlling interests     $ 3,000,000 4,000,000 5,000,000  
PNGTS | Affiliates | Portland XPress expansion project (PXP), Phase III            
Capital and operating costs charged to the pipeline systems and amount payable            
Phase in period     3 years      
GTN | TC Energy            
Capital and operating costs charged to the pipeline systems and amount payable            
Net amounts payable     $ 4,000,000 5,000,000    
GTN | TC Energy | Capital and operating costs            
Capital and operating costs charged to the pipeline systems and amount payable            
Costs charged     68,000,000 45,000,000 34,000,000  
Impact on the Partnership's net income attributable to controlling interests     $ 29,000,000 $ 33,000,000 $ 28,000,000  
Percentage of capital and operating costs charged     100.00% 100.00% 100.00%  
Bison | TC Energy            
Capital and operating costs charged to the pipeline systems and amount payable            
Net amounts payable     $ 0 $ 0    
Bison | TC Energy | Capital and operating costs            
Capital and operating costs charged to the pipeline systems and amount payable            
Costs charged     2,000,000 2,000,000 $ 6,000,000  
Impact on the Partnership's net income attributable to controlling interests     2,000,000 2,000,000 6,000,000  
North Baja | TC Energy            
Capital and operating costs charged to the pipeline systems and amount payable            
Net amounts payable     0 1,000,000    
North Baja | TC Energy | Capital and operating costs            
Capital and operating costs charged to the pipeline systems and amount payable            
Costs charged     7,000,000 5,000,000 4,000,000  
Impact on the Partnership's net income attributable to controlling interests     3,000,000 4,000,000 4,000,000  
Tuscarora | TC Energy            
Capital and operating costs charged to the pipeline systems and amount payable            
Net amounts payable     1,000,000 0    
Tuscarora | TC Energy | Capital and operating costs            
Capital and operating costs charged to the pipeline systems and amount payable            
Costs charged     6,000,000 4,000,000 4,000,000  
Impact on the Partnership's net income attributable to controlling interests     $ 3,000,000 $ 4,000,000 $ 4,000,000  
TC Pipelines, LP | ANR Pipeline Company | Technology-Based Intangible Assets [Member]            
Capital and operating costs charged to the pipeline systems and amount payable            
Finite-lived intangible assets acquired $ 38,000,000