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ACQUISITION (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
May 22, 2013
General Partner
Sep. 30, 2013
General Partner
May 22, 2013
Common Units
Sep. 30, 2013
Common Units
May 22, 2013
General Partner
Sep. 30, 2013
General Partner
Sep. 30, 2013
Senior Credit Facility
Jul. 02, 2013
Senior Credit Facility
Jul. 02, 2013
Term loans
Jul. 30, 2013
GTN and Bison
Former parent, TransCanada Subsidiaries
Transaction between entities under common control
Sep. 30, 2012
GTN and Bison
Former parent, TransCanada Subsidiaries
Transaction between entities under common control
Sep. 30, 2013
GTN and Bison
Former parent, TransCanada Subsidiaries
Transaction between entities under common control
Sep. 30, 2012
GTN and Bison
Former parent, TransCanada Subsidiaries
Transaction between entities under common control
Jul. 02, 2013
GTN and Bison
Former parent, TransCanada Subsidiaries
Transaction between entities under common control
Jul. 02, 2013
GTN
Former parent, TransCanada Subsidiaries
Transaction between entities under common control
May 03, 2011
Bison
Former parent, TransCanada Subsidiaries
Jul. 02, 2013
Bison
Former parent, TransCanada Subsidiaries
Transaction between entities under common control
Asset acquisition                                  
Interest acquired by the Partnership (as a percent)                             45.00% 25.00% 45.00%
Purchase price                           $ 1,050 $ 750   $ 300
Closing adjustments for working capital                   17              
Acquired debt                             146    
Cash paid                           921      
Units sold in public offering     8,855,000 8,800,000                          
Price per common unit in public offering     $ 43.85                            
Net proceeds from issuance of common units     373 373                          
Borrowings under the facility                 500                
Capital contribution         8 8                      
General partner ownership interest in the partnership (as a percent) 2.00% 2.00%                              
Maximum borrowing capacity             500 500 500                
Contingent consideration                           25      
Recorded purchase price                                  
Current assets                           67      
Property, plant and equipment, net                           1,792      
Other assets                           1      
Current liabilities                           (20)      
Other liabilities                           (21)      
Long-term debt                           (325)      
Net assets acquired                           1,494      
Non-controlling interest                           (448)      
Carrying value of pre-existing 25% interest in each of GTN and Bison                           (374)      
Carrying value of acquired 45% interest in each of GTN and Bison                           (672)      
Excess purchase price over net assets acquired       (244)                   249 237   12
Cash consideration                           921      
Pre-existing interest acquired by the partnership (as a percent)                             25.00%   25.00%
Increase in the net income attributable to common units resulting from retrospective consolidation                     $ 13 $ 26 $ 41