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DEBT AND CREDIT FACILITIES (Details) - USD ($)
3 Months Ended 4 Months Ended 9 Months Ended
Oct. 05, 2015
Sep. 30, 2015
Mar. 13, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 29, 2015
Jun. 01, 2015
Apr. 01, 2015
Dec. 31, 2014
Credit facilities, short-term loan facility and long-term debt                        
Credit facilities and long-term debt   $ 1,904,000,000   $ 1,904,000,000   $ 1,904,000,000 $ 1,904,000,000          
Short-term loan                       $ 170,000,000
Total credit facilities, short-term loan facility and long-term debt   1,904,000,000   1,904,000,000   1,904,000,000 1,904,000,000         1,695,000,000
Less: current portion   14,000,000   14,000,000   14,000,000 14,000,000         249,000,000
Long-term debt   $ 1,890,000,000   $ 1,890,000,000   $ 1,890,000,000 1,890,000,000         1,446,000,000
Net proceeds             $ 598,000,000 $ 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%  
Senior Credit Facility and the Term Loan Facilities due in 2018                        
Credit facilities, short-term loan facility and long-term debt                        
Leverage ratio, actual (as a percent)   4.71%   4.71%   4.71% 4.71%          
Senior Credit Facility and the Term Loan Facilities due in 2018 | Maximum                        
Credit facilities, short-term loan facility and long-term debt                        
Leverage ratio, covenant (as a percent)       5.50%                
Senior Credit Facility and the Term Loan Facilities due in 2018 | 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 and the Term Loan Facilities due in 2018 | Debt agreement covenants, initial period after occurrence of acquisition | Maximum                        
Credit facilities, short-term loan facility and long-term debt                        
Leverage ratio, covenant (as a percent)             5.50%          
Senior Credit Facility and the Term Loan Facilities due in 2018 | 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, covenant (as a percent)             5.00%          
Term loan | Short-Term Loan Facility due 2015                        
Credit facilities, short-term loan facility and long-term debt                        
Short-term loan   $ 0   $ 0   $ 0 $ 0         $ 170,000,000
Term loan | Short-Term Loan Facility due 2015 | LIBOR                        
Credit facilities, short-term loan facility and long-term debt                        
Debt average interest rate (as a percent)       1.32%     1.31%          
Debt interest rate, at period end (as a percent)                 1.32%     1.28%
Revolving credit facility | Senior Credit Facility due 2017                        
Credit facilities, short-term loan facility and long-term debt                        
Credit facilities and long-term debt   190,000,000   $ 190,000,000   190,000,000 $ 190,000,000         $ 330,000,000
Maximum borrowing capacity   500,000,000   500,000,000   500,000,000 500,000,000          
Amount outstanding under credit facility   190,000,000   190,000,000   190,000,000 190,000,000         $ 330,000,000
Remaining borrowing capacity   $ 310,000,000   $ 310,000,000   $ 310,000,000 $ 310,000,000          
Revolving credit facility | Senior Credit Facility due 2017 | LIBOR                        
Credit facilities, short-term loan facility and long-term debt                        
Debt average interest rate (as a percent)       1.44% 1.41%   1.43% 1.41%        
Debt interest rate, at period end (as a percent)   1.45%   1.45%   1.45% 1.45%         1.41%
Term loan | 2013 Term Loan Facility due 2018                        
Credit facilities, short-term loan facility and long-term debt                        
Credit facilities and long-term debt   $ 500,000,000   $ 500,000,000   $ 500,000,000 $ 500,000,000         $ 500,000,000
Term loan | 2013 Term Loan Facility due 2018 | LIBOR borrowings | LIBOR                        
Credit facilities, short-term loan facility and long-term debt                        
Debt average interest rate (as a percent)       1.44% 1.41%   1.44% 1.41%        
Debt interest rate, at period end (as a percent)   1.45%   1.45%   1.45% 1.45%         1.41%
Term loan | 2013 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)       1.85% 1.83%   1.84% 1.83%        
Term loan | 2015 Term Loan Facility due 2018                        
Credit facilities, short-term loan facility and long-term debt                        
Credit facilities and long-term debt   $ 170,000,000   $ 170,000,000   $ 170,000,000 $ 170,000,000          
Amount of debt   170,000,000   $ 170,000,000   $ 170,000,000 $ 170,000,000          
Amount borrowed   $ 170,000,000                    
Term loan | 2015 Term Loan Facility due 2018 | LIBOR                        
Credit facilities, short-term loan facility and long-term debt                        
Debt interest rate, at period end (as a percent)   3.40%   3.40%   3.40% 3.40%          
Basis spread on variable rate (as a percent) 1.15%                      
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
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          
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%
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%
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%
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                        
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%
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   44.00%   44.00%   44.00% 44.00%          
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)       1.14%     1.14%          
Debt interest rate, at period end (as a percent)   1.15%   1.15%   1.15% 1.15%          
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%