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ACQUISITION - 2017 Acquisition (Details)
6 Months Ended
Aug. 01, 2017
USD ($)
item
Jun. 01, 2017
USD ($)
Jun. 30, 2017
USD ($)
Iroquois      
ACQUISITION      
Interest acquired (as a percent)   49.34% 49.34%
Option to acquire (as a percent)   0.66  
Preliminary purchase price adjustments   $ 6,000,000  
Net purchase price $ 28,000,000 710,000,000  
Outstanding debt   164,000,000  
Payment for option to acquire   1,000  
Iroquois net purchase price      
Net Purchase Price   581,000,000  
Less: TransCanada's carrying value of Iroquois at June 1, 2017   223,000,000  
Excess purchase price   358,000,000  
Purchase price before assumption of debt   710,000,000  
Reduction in partner's equity under equity method investments   $ 358,000,000  
Iroquois | Accounts payable to affiliates      
ACQUISITION      
Net purchase price     $ 28,000,000
Portland Natural Gas Transmission System      
ACQUISITION      
Interest acquired (as a percent)   11.81%  
Interest acquired by Partnership (as a percent)   61.71%  
Preliminary purchase price adjustments   $ 3,000,000  
Net purchase price   55,000,000  
Outstanding debt   5,000,000  
PNGTS purchase price      
Current assets   25,000,000  
Property, plant and equipment, net   294,000,000  
Current liabilities   (4,000,000)  
Deferred state income taxes   (10,000,000)  
Long-term debt, including current portion   (41,000,000)  
Net Purchase Price   264,000,000  
Non-controlling interest   (100,000,000)  
Carrying value of pre-existing Investment in PNGTS   (132,000,000)  
TransCanada's carrying value of the acquired 11.81 percent interest at June 1, 2017   32,000,000  
Excess purchase price over net assets acquired   21,000,000  
Total cash consideration   53,000,000  
Purchase price before assumption of debt   58,000,000  
Reduction in partner's equity due to excess purchase price   21,000,000  
Portland Natural Gas Transmission System | Iroquois      
ACQUISITION      
Purchase price   765,000,000  
Preliminary purchase price adjustments   $ 9,000,000  
Subsequent Events | Iroquois | Investing Activities      
ACQUISITION      
Return on investment distribution classified as investing activities $ 28,000,000    
Number of quarters for distribution of surplus cash | item 11