CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Great Lakes	Jun. 30, 2012 Great Lakes	Jun. 30, 2013 Northern Border	Jun. 30, 2012 Northern Border	Jun. 30, 2013 GTN	Jun. 30, 2012 GTN	Jun. 30, 2013 Bison	Jun. 30, 2012 Bison
Cash Generated From Operations
Net income	$ 52	$ 72
Depreciation	6	6
Increase in long-term liabilities	1
Change in operating working capital (Note 9)	1	2
Total cash generated from operations	60	80
Investing Activities
Cumulative distributions in excess of equity earnings:			10	6	13	15	5	4	1	2
Investment (Note 4)			(4)	(4)					(6)
Capital expenditures	(1)
Proceeds from settlement recoveries	2
Total investing activities	20	23
Financing Activities
Distributions paid (Note 8)	(85)	(84)
Equity issuance, net (Note 6)	381
Long-term debt issued (Note 5)	12	5
Long-term debt repaid (Note 5)	(324)	(47)
Total financing activities	(16)	(126)
Increase/(decrease) in cash and cash equivalents	64	(23)
Cash and cash equivalents, beginning of period	3	29
Cash and cash equivalents, end of period	$ 67	$ 6