CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Cash Generated From Operations
Net income	$ 191	[1]	$ 229	[1]	$ 250	[1]
Depreciation	86	[1]	85	[1]	87	[1]
Amortization of debt issue costs (Note 11)	1	[1]	1	[1]	2	[1]
Equity allowance for funds used during construction					(2)	[1]
Deferred income taxes (Note 2(k))					6	[1]
Change in other long-term liabilities	2	[1]			(3)	[1]
Change in operating working capital (Note 14)	(8)	[1]
Total cash generated from operations	272	[1]	315	[1]	340	[1]
Investing Activities
Adjustment to the 2011 Acquisition (Note 6)	1	[1]
Capital expenditures	(15)	[1]	(36)	[1]	(163)	[1]
Change in affiliate demand loan receivable	21	[1]	20	[1]	4	[1]
Total investing activities	(920)	[1]	16	[1]	(725)	[1]
Financing Activities
Distributions paid on common units (Note 13)	(188)	[1]	(169)	[1]	(155)	[1]
Distributions paid to non-controlling interests	(52)	[1]	(53)	[1]	(53)	[1]
Change in affiliate demand loan payable	(15)	[1]
Equity issuance, net (Note 9)	381	[1]			338	[1]
Long term debt issued (Note 7)	937	[1]	8	[1]	1,038	[1]
Long-term debt repaid (Note 7)	(372)	[1]	(62)	[1]	(971)	[1]
Debt issue costs	(2)	[1]			(7)	[1]
Equity contribution from Bison's former parent (Note 16)	18	[1]			305	[1]
Distributions paid to former parent of GTN and Bison	(37)	[1]	(81)	[1]	(85)	[1]
Total financing activities	670	[1]	(357)	[1]	410	[1]
Increase/(decrease) in cash and cash equivalents	22	[1]	(26)	[1]	25	[1]
Cash and cash equivalents, beginning of year	3	[1]	29	[1]	4	[1]
Cash and cash equivalents, end of year	25	[1]	3	[1]	29	[1]
Interest payments made	42	[1]	42	[1]	31	[1]
Income taxes paid, net of refunds (Note 2(k))					6	[1]
Supplemental information about non-cash investing and financing activities
Accrual for Carty Lateral consideration payment (Note 16)	25	[1]
Calpine receivable distributed					9	[1]
Interaffiliate account representing pension plan and other post-retirement benefits distributed					9	[1]
GTN and Bison
Investing Activities
Acquisition of additional interests, net of cash acquired (Note 6)	(921)	[1]			(539)	[1]
Great Lakes
Investing Activities
Cumulative distributions in excess of equity earnings:	14	[1]	17	[1]	13	[1]
Investment (Note 4)	(9)	[1]	(9)	[1]	(9)	[1]
Northern Border
Investing Activities
Cumulative distributions in excess of equity earnings:	20	[1]	24	[1]	24	[1]
Investment (Note 4)	$ (31)	[1]			$ (55)	[1]

[1] (a) Recast as discussed in Note 2 and Note 6.