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PARTNERS' EQUITY (Details) (USD $)
In Millions, unless otherwise specified
2 Months Ended 9 Months Ended 2 Months Ended 9 Months Ended 1 Months Ended 2 Months Ended 1 Months Ended
Sep. 30, 2014
TC PipeLines GP, Inc.
General Partner
Sep. 30, 2014
TC PipeLines GP, Inc.
General Partner
Sep. 30, 2014
ATM Equity Issuance
Sep. 30, 2014
ATM Equity Issuance
Aug. 31, 2014
ATM Equity Issuance
Limited Partners
Institution
Sep. 30, 2014
ATM Equity Issuance
Limited Partners
Sep. 30, 2014
ATM Equity Issuance
General Partner
Aug. 31, 2014
ATM Equity Issuance
Maximum
Expected
Limited Partners
Aug. 31, 2014
ATM Equity Issuance
Minimum
Limited Partners
Institution
Partners' Equity                  
Number of financial institutions         5        
Gross proceeds from sale of common units               $ 200  
Number of managers to agree with equity sale method                 1
Units sold           1.3      
Net proceeds from equity issuance     73 73     1    
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 2.00% 2.00%              
Sales agent commissions           $ 1