SUBSEQUENT EVENTS (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended			3 Months Ended		0 Months Ended
	Jul. 02, 2013 GTN Former parent, TransCanada subsidiaries Transaction between entities under common control	Mar. 31, 2014 Great Lakes	Mar. 31, 2014 Northern Border	Mar. 31, 2014 GTN	Mar. 31, 2014 Bison	Apr. 25, 2014 Subsequent event	Apr. 11, 2014 Subsequent event GTN Former parent, TransCanada subsidiaries Transaction between entities under common control	Apr. 07, 2014 Subsequent event GTN	May 01, 2014 Subsequent event GTN Expected	Apr. 07, 2014 Subsequent event Bison	May 01, 2014 Subsequent event Bison Expected	Apr. 16, 2014 Subsequent event Distribution declared Northern Border	Apr. 07, 2014 Subsequent event Distribution declared Great Lakes	May 01, 2014 Subsequent event Cash Distribution Paid Northern Border Expected	May 01, 2014 Subsequent event Cash Distribution Paid Great Lakes Expected
Subsequent events
Cash distribution (in dollars per unit)						$ 0.81
Aggregate distribution declared and payable by investee								$ 36		$ 16
Partnership interest (as a percent)	70.00%			70.00%	70.00%
Distribution received by Partnership									25		11
Partnership distribution												52	29
Ownership interest (as a percent)		46.45%	50.00%
Partnership's share of distributions declared and payable by investee														26	13
Payment with respect to the Carty Lateral consideration							$ 25