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DEBT Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 08, 2015
Dec. 17, 2014
Nov. 26, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 07, 2015
Aug. 22, 2014
Jun. 10, 2014
Jun. 04, 2014
May. 30, 2014
Jan. 31, 2014
Debt Instrument                          
Commercial paper program, maximum authorized amount outstanding $ 400,000,000.0       $ 400,000,000.0                
Commercial paper [1] $ 94,990,000       $ 94,990,000                
Commercial paper, weighted average interest rate 0.80%       0.80%                
Commercial paper, weighted average days to maturity 6 days                        
Loss on extinguishment of debt         $ 0 $ 29,205,000 $ 0            
Retirement of long-term debt         175,000,000 298,625,000 452,000,000            
ITC Holdings Corp.                          
Debt Instrument                          
Loss on extinguishment of debt         0 29,205,000 0            
Retirement of long-term debt         $ 0 $ 248,625,000 $ 267,000,000            
Weighted average interest rate [2] 1.60%       1.60%                
ITC Holdings Corp. | Senior Notes, due September 30, 2016 | Unsecured Debt                          
Debt Instrument                          
Principle amount                       $ 255,000,000  
Debt instrument, repurchased face amount                       115,600,000  
Interest rate 5.875%       5.875% 5.875%              
ITC Holdings Corp. | Senior Notes, due September 30, 2036 | Unsecured Debt                          
Debt Instrument                          
Principle amount                       255,000,000  
Debt instrument, repurchased face amount                       $ 54,700,000  
Interest rate 6.375%       6.375% 6.375%              
ITC Holdings Corp. | Senior Notes, due June 15, 2024 | Unsecured Debt                          
Debt Instrument                          
Principle amount                     $ 400,000,000    
Interest rate 3.65%       3.65% 3.65%         3.65%    
ITCTransmission                          
Debt Instrument                          
Weighted average interest rate [3] 1.40%       1.40%                
ITCTransmission | First Mortgage Bonds, Series F, due June 10, 2044 | Secured Debt                          
Debt Instrument                          
Principle amount                   $ 100,000,000      
Interest rate 4.27%       4.27% 4.27%       4.27%      
ITCTransmission | First Mortgage Bonds, Series F, due June 10, 2044 | Secured Debt | Tranche One                          
Debt Instrument                          
Principle amount                   $ 75,000,000      
ITCTransmission | First Mortgage Bonds, Series F, due June 10, 2044 | Secured Debt | Tranche Two                          
Debt Instrument                          
Principle amount                 $ 25,000,000        
METC                          
Debt Instrument                          
Weighted average interest rate [3] 1.40%       1.40%                
METC | Term Loan Credit Agreement, due December 7, 2018                          
Debt Instrument                          
Weighted average interest rate [2] 1.30%       1.30%                
METC | Term Loan Credit Agreement, due December 7, 2018 | Unsecured Debt                          
Debt Instrument                          
Other long-term debt $ 200,000,000 $ 200,000,000     $ 200,000,000                
METC | Senior Secured Notes, due December 10, 2015 | Secured Debt                          
Debt Instrument                          
Interest rate   5.75%       5.75%              
Retirement of long-term debt   $ 175,000,000                      
METC | Term Loan Credit Agreement, due February 2, 2015 | Unsecured Debt                          
Debt Instrument                          
Other long-term debt                         $ 50,000,000
Retirement of long-term debt     $ 50,000,000                    
METC | Senior Secured Notes, due December 15, 2044 | Secured Debt                          
Debt Instrument                          
Principle amount     $ 150,000,000                    
Interest rate 4.19%   4.19%   4.19% 4.19%              
METC | Senior Secured Notes, due December 18, 2014 | Secured Debt                          
Debt Instrument                          
Interest rate     6.63%                    
Retirement of long-term debt     $ 50,000,000                    
ITC Midwest                          
Debt Instrument                          
Weighted average interest rate [3] 1.40%       1.40%                
ITC Midwest | First Mortgage Bonds, Series G, due April 7, 2055 | Secured Debt                          
Debt Instrument                          
Principle amount               $ 225,000,000          
Interest rate 3.83%       3.83%                
ITC Midwest | First Mortgage Bonds, Series G, due 2055 | Secured Debt                          
Debt Instrument                          
Interest rate               3.83%          
ITC Great Plains                          
Debt Instrument                          
Weighted average interest rate [3] 1.40%       1.40%                
ITC Great Plains | First Mortgage Bonds, Series A, due May 26, 2044 | Secured Debt                          
Debt Instrument                          
Principle amount       $ 150,000,000                  
Interest rate 4.16%     4.16% 4.16% 4.16%              
ITC Great Plains | Term Loan Credit Agreement, due November 28, 2014 | Unsecured Debt                          
Debt Instrument                          
Retirement of long-term debt       $ 100,000,000                  
[1] As of December 31, 2015 and 2014, there was $395.3 million and $175.0 million, respectively, of debt included within debt maturing within one year that is classified as a current liability in the consolidated statements of financial position.
[2] Loan bears interest at a rate equal to LIBOR plus an applicable margin of 1.25% or at a base rate, which is defined as the higher of the prime rate, 0.50% above the federal funds rate or 1.00% above the one month LIBOR, plus an applicable margin of 0.25%, subject to adjustments based on ITC Holdings’ credit rating.
[3] Loans bear interest at a rate equal to LIBOR plus an applicable margin of 1.00% or at a base rate, which is defined as the higher of the prime rate, 0.50% above the federal funds rate or 1.00% above the one month LIBOR, subject to adjustments based on the borrower’s credit rating.