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RELATED PARTY TRANSACTIONS (Details)
$ in Millions
1 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended
Sep. 21, 2017
Bcf
Apr. 24, 2017
Dec. 31, 2015
USD ($)
May 03, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Feb. 28, 2018
Feb. 01, 2018
Jan. 31, 2018
Sep. 01, 2017
Aug. 01, 2017
Jun. 01, 2017
Jan. 31, 2017
Jan. 01, 2016
Capital and operating costs charged to the pipeline systems and amount payable                                
Net amounts payable         $ 5 $ 8 [1],[2]                    
Interest acquired (as a percent)                         49.34%      
Amount included in receivables from related party         1 2                    
Provision for rate refund (liability) [1]             $ (101)                  
Great Lakes Settlement | NEB                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Term of contract   10 years                            
Termination options beginning   3 years                            
Total revenue earned         $ 13                      
Great Lakes Settlement | NEB | Maximum                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Transportation capacity per day | Bcf 0.711                              
Northern Border                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Interest acquired (as a percent)                       50.00%        
Portland Natural Gas Transmission System                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Interest acquired (as a percent)         61.71%                      
Great Lakes                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Interest acquired (as a percent)         46.45%         46.45%         46.45%  
Refund paid to shippers         $ 7                      
Percentage of refund paid to shippers         86.00%                      
Estimated revenue sharing provision         $ 40                      
Provision for rate refund (liability)         $ 8                      
Northern Border                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Interest acquired (as a percent)         50.00%       50.00%   50.00%          
Iroquois                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Interest acquired (as a percent)         49.34%                 49.34%    
Portland Natural Gas Transmission System                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Interest acquired (as a percent)                           11.81%   49.90%
General Partner | Reimbursement of costs of services provided                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Costs charged         $ 4 3 3                  
TransCanada's subsidiaries | Great Lakes                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Net amounts payable         3 4                    
Amount included in receivables from related party         20 19                    
TransCanada's subsidiaries | Great Lakes | Capital and operating costs                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Costs charged         36 30 30                  
Impact on the Partnership's net income attributable to controlling interests         $ 15 $ 13 $ 13                  
Percentage of capital and operating costs charged         100.00% 100.00% 100.00%                  
Amount included in receivables from related party         $ 64 $ 27                    
TransCanada's subsidiaries | Great Lakes | Transportation contracts | Total net revenues | Customer concentration risk                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Percent of total revenues         57.00% 68.00% 71.00%                  
TransCanada's subsidiaries | Great Lakes | Affiliated rental revenue                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Percent of total revenues         1.00% 1.00% 1.00%                  
TransCanada's subsidiaries | Northern Border                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Net amounts payable         $ 4 $ 4                    
TransCanada's subsidiaries | Northern Border | Capital and operating costs                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Costs charged         $ 43 $ 32 $ 36                  
Percentage of capital and operating costs charged         100.00% 100.00% 100.00%                  
TransCanada's subsidiaries | Portland Natural Gas Transmission System                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Net amounts payable         $ 1 $ 1                    
TransCanada's subsidiaries | Portland Natural Gas Transmission System | Capital and operating costs                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Costs charged         $ 9 $ 8 $ 8                  
Percentage of capital and operating costs charged         100.00% 100.00% 100.00%                  
TransCanada's subsidiaries | Portland Natural Gas Transmission System | Transportation contracts                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Revenues from related party             $ 3                  
TransCanada's subsidiaries | GTN                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Net amounts payable         $ 3 $ 3                    
TransCanada's subsidiaries | GTN | Capital and operating costs                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Costs charged         34 27 30                  
Impact on the Partnership's net income attributable to controlling interests         $ 29 $ 24 $ 25                  
Percentage of capital and operating costs charged         100.00% 100.00% 100.00%                  
TransCanada's subsidiaries | Bison                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Net amounts payable         $ 1 $ 1                    
TransCanada's subsidiaries | Bison | Capital and operating costs                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Costs charged         6 2 $ 4                  
Impact on the Partnership's net income attributable to controlling interests         $ 6 $ 3 $ 4                  
Percentage of capital and operating costs charged         100.00% 100.00% 100.00%                  
TransCanada's subsidiaries | North Baja Pipeline, LLC                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Net amounts payable           $ 1                    
TransCanada's subsidiaries | North Baja Pipeline, LLC | Capital and operating costs                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Costs charged         $ 4 4 $ 5                  
Impact on the Partnership's net income attributable to controlling interests         4 4 5                  
TransCanada's subsidiaries | Tuscarora Gas Transmission Company                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Net amounts payable           1                    
TransCanada's subsidiaries | Tuscarora Gas Transmission Company | Capital and operating costs                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Costs charged         4 5 4                  
Impact on the Partnership's net income attributable to controlling interests         4 4 4                  
TransCanada's subsidiaries | Northern Border | Capital and operating costs                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Impact on the Partnership's net income attributable to controlling interests         16 12 14                  
TransCanada's subsidiaries | Portland Natural Gas Transmission System | Capital and operating costs                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Impact on the Partnership's net income attributable to controlling interests         5 5 $ 5                  
TransCanada's subsidiaries | Portland Natural Gas Transmission System | Transportation contracts                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Amount included in receivables from related party         0                      
Revenues from related party         1 $ 2                    
ANR Pipeline Company | Great Lakes | Firm service between Michigan and Wisconsin                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Deferred revenue related to services performed       $ 14       $ 9                
Deferred revenue recognized     $ 23                          
Affiliates | Portland Natural Gas Transmission System | Construction of facilities                                
Capital and operating costs charged to the pipeline systems and amount payable                                
Development expenses incurred by affiliates         $ 3                      
[1] Recast to consolidate PNGTS (Refer to Notes 2 and 7).
[2] Recast to consolidate PNGTS (Refer to Notes 2 and 7).