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CREDIT FACILITIES, SHORT-TERM LOAN FACILITY AND LONG-TERM DEBT (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 13, 2015
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 01, 2015
May. 31, 2015
Apr. 01, 2015
Dec. 31, 2014
Credit facilities, short-term loan facility and long-term debt                      
Total credit facilities and long-term debt $ 1,914,000,000   $ 1,914,000,000 $ 1,914,000,000   $ 1,914,000,000         $ 1,695,000,000
Less: current portion 184,000,000   184,000,000 184,000,000   184,000,000         249,000,000
Long-term debt $ 1,730,000,000   $ 1,730,000,000 $ 1,730,000,000   1,730,000,000         1,446,000,000
Net proceeds           $ 424,000,000 $ 15,000,000        
GTN | Former parent, TransCanada subsidiaries | Transaction between entities under common control                      
Credit facilities, short-term loan facility and long-term debt                      
Interest acquired by Partnership (as a percent) 30.00%   30.00% 30.00% 30.00% 30.00% 30.00%     30.00%  
Senior Credit Facility, Term Loan Facility and Short-Term Loan Facility                      
Credit facilities, short-term loan facility and long-term debt                      
Leverage ratio (as a percent) 4.84%                    
Senior Credit Facility, Term Loan Facility and Short-Term Loan Facility | Debt agreement covenants, initial period after occurrence of acquisition                      
Credit facilities, short-term loan facility and long-term debt                      
Additional period immediately following the fiscal quarter in which a specified material acquisition occurs           6 months          
Senior Credit Facility, Term Loan Facility and Short-Term Loan Facility | Debt agreement covenants, initial period after occurrence of acquisition | Maximum                      
Credit facilities, short-term loan facility and long-term debt                      
Leverage ratio (as a percent)           5.50%          
Senior Credit Facility, Term Loan Facility and Short-Term Loan Facility | Debt agreement covenants, periods subsequent to initial period after occurrence of acquisition | Maximum                      
Credit facilities, short-term loan facility and long-term debt                      
Leverage ratio (as a percent)           5.00%          
Term loan | Short-Term Loan Facility due 2015                      
Credit facilities, short-term loan facility and long-term debt                      
Total credit facilities and long-term debt $ 170,000,000   $ 170,000,000 $ 170,000,000   $ 170,000,000         $ 170,000,000
Term loan | Short-Term Loan Facility due 2015 | LIBOR                      
Credit facilities, short-term loan facility and long-term debt                      
Variable rate basis           LIBOR          
Debt average interest rate (as a percent)       1.31%   1.30%          
Debt interest rate, at period end (as a percent) 1.31%   1.31% 1.31%   1.31%         1.28%
Senior revolving credit facility | Senior Credit Facility due 2017                      
Credit facilities, short-term loan facility and long-term debt                      
Total credit facilities and long-term debt $ 200,000,000   $ 200,000,000 $ 200,000,000   $ 200,000,000         $ 330,000,000
Maximum borrowing capacity 500,000,000   500,000,000 500,000,000   500,000,000          
Amount outstanding under credit facility 200,000,000   200,000,000 200,000,000   200,000,000         $ 330,000,000
Remaining borrowing capacity $ 300,000,000   $ 300,000,000 $ 300,000,000   $ 300,000,000          
Senior revolving credit facility | Senior Credit Facility due 2017 | LIBOR                      
Credit facilities, short-term loan facility and long-term debt                      
Variable rate basis       LIBOR   LIBOR          
Debt average interest rate (as a percent)       1.44% 1.41% 1.43% 1.41%        
Debt interest rate, at period end (as a percent) 1.44%   1.44% 1.44%   1.44%         1.41%
Term loan | Term Loan Facility due 2018                      
Credit facilities, short-term loan facility and long-term debt                      
Total credit facilities and long-term debt $ 500,000,000   $ 500,000,000 $ 500,000,000   $ 500,000,000         $ 500,000,000
Term loan | Term Loan Facility due 2018 | LIBOR borrowings | LIBOR                      
Credit facilities, short-term loan facility and long-term debt                      
Variable rate basis       LIBOR   LIBOR          
Debt average interest rate (as a percent)       1.44%   1.43% 1.41%        
Debt interest rate, at period end (as a percent) 1.44%   1.44% 1.44%   1.44%         1.41%
Term loan | Term Loan Facility due 2018 | LIBOR borrowings | LIBOR | Hedges of cash flows | Interest rate swaps                      
Credit facilities, short-term loan facility and long-term debt                      
Debt average interest rate (as a percent)       1.84% 1.83% 1.84% 1.83%        
Unsecured debt | 4.65% Senior Notes due 2021                      
Credit facilities, short-term loan facility and long-term debt                      
Stated interest rate (as a percent) 4.65%   4.65% 4.65%   4.65%         4.65%
Discount $ 0   $ 0 $ 0   $ 0         $ 0
Total credit facilities and long-term debt $ 350,000,000   $ 350,000,000 $ 350,000,000   $ 350,000,000         $ 350,000,000
Unsecured debt | 4.375% Senior Notes due 2025                      
Credit facilities, short-term loan facility and long-term debt                      
Stated interest rate (as a percent) 4.375% 4.375% 4.375% 4.375%   4.375%          
Discount $ 1,000,000   $ 1,000,000 $ 1,000,000   $ 1,000,000          
Total credit facilities and long-term debt $ 349,000,000   $ 349,000,000 $ 349,000,000   $ 349,000,000          
Amount of debt   $ 350,000,000                  
Net proceeds   $ 346,000,000                  
Unsecured debt | 5.09% Senior Notes due 2015                      
Credit facilities, short-term loan facility and long-term debt                      
Stated interest rate (as a percent)                     5.09%
Total credit facilities and long-term debt                     $ 75,000,000
Unsecured debt | 5.29% Senior Notes due 2020                      
Credit facilities, short-term loan facility and long-term debt                      
Stated interest rate (as a percent) 5.29%   5.29% 5.29%   5.29%         5.29%
Total credit facilities and long-term debt $ 100,000,000   $ 100,000,000 $ 100,000,000   $ 100,000,000         $ 100,000,000
Unsecured debt | 5.69% Senior Notes due 2035                      
Credit facilities, short-term loan facility and long-term debt                      
Stated interest rate (as a percent) 5.69%   5.69% 5.69%   5.69%         5.69%
Total credit facilities and long-term debt $ 150,000,000   $ 150,000,000 $ 150,000,000   $ 150,000,000         $ 150,000,000
Unsecured debt | Term Loan Facility due 2019                      
Credit facilities, short-term loan facility and long-term debt                      
Total credit facilities and long-term debt $ 75,000,000   $ 75,000,000 $ 75,000,000   $ 75,000,000          
Secured debt | 3.82% Series D Senior Notes due 2017                      
Credit facilities, short-term loan facility and long-term debt                      
Stated interest rate (as a percent) 3.82%   3.82% 3.82%   3.82%         3.82%
Total credit facilities and long-term debt $ 20,000,000   $ 20,000,000 $ 20,000,000   $ 20,000,000         $ 20,000,000
GTN                      
Credit facilities, short-term loan facility and long-term debt                      
Percentage of debt to total capitalization, actual 43.00%   43.00% 43.00%   43.00%          
GTN | Unsecured debt | 5.09% Senior Notes due 2015                      
Credit facilities, short-term loan facility and long-term debt                      
Stated interest rate (as a percent)                 5.09%    
GTN | Unsecured debt | Term Loan Facility due 2019 | Maximum                      
Credit facilities, short-term loan facility and long-term debt                      
Percentage of debt to total capitalization, covenant     70.00%                
GTN | Unsecured debt | Term Loan Facility due 2019 | LIBOR                      
Credit facilities, short-term loan facility and long-term debt                      
Debt average interest rate (as a percent)     1.13%                
Debt interest rate, at period end (as a percent) 1.13%   1.13% 1.13%   1.13%          
Amount of debt               $ 75,000,000      
GTN | Senior Notes | Maximum                      
Credit facilities, short-term loan facility and long-term debt                      
Percentage of debt to total capitalization, covenant           70.00%