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CHANGE IN OPERATING WORKING CAPITAL (Details 2) (GTN, Former parent, TransCanada subsidiaries, Transaction between entities under common control, Accounts payable to affiliates, USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
GTN | Former parent, TransCanada subsidiaries | Transaction between entities under common control | Accounts payable to affiliates
  
Acquisition  
Accrued additional consideration for Carty Lateral $ 25us-gaap_BusinessCombinationContingentConsiderationLiability
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