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ACQUISITIONS (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Mar. 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
Jun. 29, 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                    
Price per common unit issued (in dollars per unit)   $ 47.58                    
Net proceeds from issuance of common units   331                    
Amount drawn on credit facility to finance acquisition       61 125              
Maximum borrowing capacity       400 250              
Contribution by General Partners           7            
General partner ownership interest in the partnership (as a percent) 2.00%                      
Cash on hand             15          
Payment to be made to TransCanada                       $ 2