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ACQUISITIONS (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 1 Months Ended
May 31, 2011
Dec. 31, 2011
Jul. 13, 2011
Senior revolving credit facility
May 31, 2011
General Partner
Dec. 31, 2012
General Partner
May 31, 2011
GTN and Bison
Dec. 31, 2011
GTN and Bison
May 03, 2011
GTN and Bison
Bridge loan facility
May 03, 2011
GTN and Bison
Senior revolving credit facility
May 31, 2011
GTN and Bison
TransCanada Subsidiaries
May 03, 2011
GTN and Bison
TransCanada Subsidiaries
May 03, 2011
GTN
TransCanada Subsidiaries
May 31, 2011
Bison
TransCanada Subsidiaries
May 03, 2011
Bison
TransCanada Subsidiaries
Mar. 25, 2011
Yuma Lateral Asset Acquisition
TransCanada Corporation
Mar. 05, 2010
Yuma Lateral Asset Acquisition
TransCanada Corporation
Maximum
Asset acquisition                                
Interest acquired by the Partnership (as a percent)                       25.00%   25.00%    
Purchase price                     $ 605 $ 405   $ 200    
Acquired debt                       81        
Percentage of acquired debt                       25.00%        
Future commitments related to acquisitions                         9      
Additional payment to TransCanada           23                    
Purchase price recorded as working capital             1                  
Cash paid                     539       2  
Number of common units sold in public offering 7,245,000         7,245,000                    
Price per common unit issued $ 47.58         $ 47.58                    
Net proceeds from issuance of common units 331         331                    
Amount drawn on credit facility to finance acquisition               61 125              
Maximum borrowing capacity     250         400 250              
Contribution by General Partners                   7            
General partner ownership interest in the partnership (as a percent)       2.00% 2.00%                      
Cash on hand                     15          
Excess purchase price paid recorded as reduction to Partner's equity   (134)         (131)                  
Payment to be made to TransCanada                               $ 2