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RELATED PARTY TRANSACTIONS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
General Partner
Reimbursement of costs of services provided
Sep. 30, 2013
General Partner
Reimbursement of costs of services provided
Sep. 30, 2014
General Partner
Reimbursement of costs of services provided
Sep. 30, 2013
General Partner
Reimbursement of costs of services provided
Sep. 30, 2014
TransCanada's subsidiaries
Great Lakes
Dec. 31, 2013
TransCanada's subsidiaries
Great Lakes
Sep. 30, 2014
TransCanada's subsidiaries
Great Lakes
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Great Lakes
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
Great Lakes
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Great Lakes
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
Great Lakes
Transportation contracts
Sep. 30, 2013
TransCanada's subsidiaries
Great Lakes
Transportation contracts
Sep. 30, 2014
TransCanada's subsidiaries
Great Lakes
Transportation contracts
Sep. 30, 2013
TransCanada's subsidiaries
Great Lakes
Transportation contracts
Dec. 31, 2013
TransCanada's subsidiaries
Great Lakes
Transportation contracts
Sep. 30, 2014
TransCanada's subsidiaries
Great Lakes
Affiliated rental revenue
Sep. 30, 2013
TransCanada's subsidiaries
Great Lakes
Affiliated rental revenue
Sep. 30, 2014
TransCanada's subsidiaries
Great Lakes
Affiliated rental revenue
Sep. 30, 2013
TransCanada's subsidiaries
Great Lakes
Affiliated rental revenue
Sep. 30, 2014
TransCanada's subsidiaries
Northern Border
Dec. 31, 2013
TransCanada's subsidiaries
Northern Border
Sep. 30, 2014
TransCanada's subsidiaries
Northern Border
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Northern Border
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
Northern Border
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Northern Border
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
GTN
Dec. 31, 2013
TransCanada's subsidiaries
GTN
Sep. 30, 2014
TransCanada's subsidiaries
GTN
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
GTN
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
GTN
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
GTN
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
Bison
Sep. 30, 2014
TransCanada's subsidiaries
Bison
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Bison
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
Bison
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Bison
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
North Baja Pipeline, LLC
Dec. 31, 2013
TransCanada's subsidiaries
North Baja Pipeline, LLC
Sep. 30, 2014
TransCanada's subsidiaries
North Baja Pipeline, LLC
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
North Baja Pipeline, LLC
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
North Baja Pipeline, LLC
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
North Baja Pipeline, LLC
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
Tuscarora Gas Transmission Company
Sep. 30, 2014
TransCanada's subsidiaries
Tuscarora Gas Transmission Company
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Tuscarora Gas Transmission Company
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
Tuscarora Gas Transmission Company
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Tuscarora Gas Transmission Company
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
Great Lakes
Sep. 30, 2013
TransCanada's subsidiaries
Great Lakes
Sep. 30, 2014
TransCanada's subsidiaries
Great Lakes
Sep. 30, 2013
TransCanada's subsidiaries
Great Lakes
Sep. 30, 2014
TransCanada's subsidiaries
Great Lakes
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Great Lakes
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
Great Lakes
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Great Lakes
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
Northern Border
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Northern Border
Capital and operating costs
Sep. 30, 2014
TransCanada's subsidiaries
Northern Border
Capital and operating costs
Sep. 30, 2013
TransCanada's subsidiaries
Northern Border
Capital and operating costs
Sep. 30, 2014
GTN
Apr. 11, 2014
GTN
Former parent, TransCanada subsidiaries
Transaction between entities under common control
Dec. 31, 2013
GTN
Former parent, TransCanada subsidiaries
Transaction between entities under common control
Accounts payable to affiliates
Capital and operating costs charged to the pipeline systems and amount payable                                                                                                                                
Costs charged     $ 1 $ 1 $ 2 $ 3     $ 7 $ 7 $ 22 $ 23                       $ 9 $ 7 $ 26 $ 21     $ 8 $ 7 $ 21 $ 21   $ 2 $ 1 $ 4 $ 4     $ 1 $ 1 $ 3 $ 3   $ 1 $ 1 $ 3 $ 3                              
Impact on the Partnership's net income attributable to controlling interests                                                           5 5 14 14   1 1 3 3     1 1 3 3   1 1 3 3         3 3 10 10 4 3 11 10      
Accounts payable to affiliates 17 29         13 3                           12 3         11 3         1         1 1         1                                      
Percentage of capital and operating costs charged                 100.00% 100.00% 100.00% 100.00%                       100.00% 100.00% 100.00% 100.00%     100.00% 100.00% 100.00% 100.00%   100.00% 100.00% 100.00% 100.00%                                                    
Revenues from related party                         13 14 48 49   0 1 1 1                                                                                      
Percentage of revenues from TransCanada and its affiliates to total revenues                         46.00% 54.00% 46.00% 54.00%                                                                                                
Revenue from TransCanada and its affiliates included in the Partnership's equity earnings                                                                                                   6 7 23 23                      
Amount included in receivables from related party                         7   7   11                                                                                              
Accrued additional consideration                                                                                                                               25
Payment with respect to the Carty Lateral consideration                                                                                                                           $ 25 $ 25