CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Cash Generated From Operations
Net income	$ 204		$ 191	[1]	$ 229	[1]
Depreciation	86		86	[1]	85	[1]
Amortization of debt issue costs (Note 11)	1		1	[1]	1	[1]
Change in other long-term liabilities			2	[1]
Change in operating working capital (Note 14)	17		(8)	[1]
Total cash generated from operations	308		272	[1]	315	[1]
Investing Activities
Adjustment to the 2011 Acquisition			1	[1]
Capital expenditures	(10)		(15)	[1]	(36)	[1]
Change in affiliate demand loan receivable			21	[1]	20	[1]
Total investing activities	(234)		(920)	[1]	16	[1]
Financing Activities
Distributions paid (Note 13)	(212)		(188)	[1]	(169)	[1]
Distributions paid to non-controlling interests	(50)		(52)	[1]	(53)	[1]
Change in affiliate demand loan payable			(15)	[1]
Long-term debt issued (Note 7)	35		937	[1]	8	[1]
Short-term loan issued (Note 7)	170
Long-term debt repaid (Note 7)	(89)		(372)	[1]	(62)	[1]
Debt issue costs			(2)	[1]
Equity contribution from Bison's former parent (Note 16)			18	[1]
Distributions paid to former parent of GTN and Bison			(37)	[1]	(81)	[1]
Total financing activities	(73)		670	[1]	(357)	[1]
Increase/(decrease) in cash and cash equivalents	1		22	[1]	(26)	[1]
Cash and cash equivalents, beginning of year	25	[1]	3	[1]	29	[1]
Cash and cash equivalents, end of year	26		25	[1]	3	[1]
Interest payments made	47		42	[1]	42	[1]
Supplemental information about non-cash investing and financing activities
Accrual for Carty Lateral consideration payment (Note 16)			25	[1]
ATM Equity Issuance Program
Financing Activities
Equity issuance, net (Note 9)	73
Equity Issuance, May 2013
Financing Activities
Equity issuance, net (Note 9)			381	[1]
GTN and Bison
Investing Activities
Acquisition of additional interests, net of cash acquired (Note 6)			(921)	[1]
GTN
Investing Activities
Acquisition of interest	(25)
Bison
Investing Activities
Acquisition of remaining 30 percent interest	(217)
Great Lakes
Investing Activities
Cumulative distributions in excess of equity earnings	9		14	[1]	17	[1]
Investment in unconsolidated affiliate (Note 4)	(9)		(9)	[1]	(9)	[1]
Northern Border
Investing Activities
Cumulative distributions in excess of equity earnings	18		20	[1]	24	[1]
Investment in unconsolidated affiliate (Note 4)			$ (31)	[1]

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