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CASH DISTRIBUTIONS - Distributions by Payment Date (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 12, 2021
Nov. 13, 2020
Aug. 14, 2020
May 12, 2020
Feb. 14, 2020
Nov. 14, 2019
Aug. 14, 2019
May 13, 2019
Feb. 11, 2019
Nov. 14, 2018
Aug. 15, 2018
May 15, 2018
Feb. 13, 2018
Apr. 01, 2015
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Partners' Equity                                                  
Per Unit Distribution, paid (in dollars per unit)   $ 0.65 $ 0.65 $ 0.65 $ 0.65 $ 0.65 $ 0.65 $ 0.65 $ 0.65 $ 0.65 $ 0.65 $ 0.65 $ 1.00                        
Cash distribution                                             $ 8,000,000 $ 13,000,000 $ 15,000,000
General Partner 2% paid   $ 1,000,000 $ 1,000,000 $ 1,000,000 $ 1,000,000 $ 1,000,000 $ 1,000,000 $ 1,000,000 $ 1,000,000 $ 1,000,000 $ 1,000,000 $ 1,000,000 $ 2,000,000                        
General Partner IDRs paid   0 0 0 0 0 0 0 0 0 0 0 3,000,000                   0 0 3,000,000
Total Cash Distribution   47,000,000 47,000,000 47,000,000 55,000,000 47,000,000 47,000,000 47,000,000 60,000,000 47,000,000 47,000,000 47,000,000 91,000,000                   $ 189,000,000 $ 189,000,000 $ 218,000,000
T C Pipelines L                                                  
Partners' Equity                                                  
Ownership interest in the partnership                                             2.00%    
Subsequent Events                                                  
Partners' Equity                                                  
Per Unit Distribution, paid (in dollars per unit) $ 0.65                                                
General Partner 2% paid $ 1,000,000                                                
General Partner IDRs paid 0                                                
Total Cash Distribution $ 47,000,000                                                
Common units                                                  
Partners' Equity                                                  
Cash distribution   46,000,000 46,000,000 46,000,000 46,000,000 46,000,000 46,000,000 46,000,000 46,000,000 46,000,000 46,000,000 46,000,000 71,000,000                        
Total Cash Distribution                             $ 47,000,000 $ 47,000,000 $ 47,000,000 $ 47,000,000 $ 47,000,000 $ 47,000,000 $ 47,000,000 $ 47,000,000      
Common units | Subsequent Events                                                  
Partners' Equity                                                  
Per Unit Distribution, paid (in dollars per unit) $ 0.65                                                
Cash distribution $ 46,000,000                                                
Class B units                                                  
Partners' Equity                                                  
Cash distribution   $ 0 $ 0 $ 0 $ 8,000,000 $ 0 $ 0 $ 0 $ 13,000,000 $ 0 $ 0 $ 0 $ 15,000,000                        
Total Cash Distribution                             $ 0 $ 0 $ 0 $ 8,000,000 $ 0 $ 0 $ 0 $ 13,000,000      
Class B units | Subsequent Events                                                  
Partners' Equity                                                  
Cash distribution $ 0                                                
GTN | Class B units | TC Energy | Distributions                                                  
Partners' Equity                                                  
Portion of GTN's annual distributions to which the Class B units are entitled to receive a percentage share of the distributions above threshold (as a percent)                           30.00%                 30.00%    
General Partner | Common units | T C Pipelines L                                                  
Partners' Equity                                                  
Ownership interest in the partnership                                             2.00% 2.00% 2.00%