CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013 Bison	Sep. 30, 2013 GTN and Bison	Sep. 30, 2012 GTN and Bison	Sep. 30, 2013 Great Lakes	Sep. 30, 2012 Great Lakes	Sep. 30, 2013 Northern Border	Sep. 30, 2012 Northern Border
Cash Generated From Operations
Net income	$ 141	[1]	$ 176	[1]
Depreciation	64		64
Amortization of debt issue costs	1		1
Change in other assets	(4)
Change in long-term liabilities	2
Change in operating working capital (Note 10)	11		13
Total cash generated from operations	215		254
Investing Activities
Cumulative distributions in excess of equity earnings:								15	11	18	17
Investment (Note 3)								(4)	(4)
Acquisition of additional interests, net of cash acquired (Note 4)						(921)
Adjustment to May 2011 acquisition (Note 7)	1
Capital expenditures	(9)		(25)
Change in affiliate demand loan receivable	(24)		(13)
Total investing activities	(924)		(14)
Financing Activities
Distributions paid on common units (Note 9)	(137)		(127)
Distributions paid to non-controlling interests	(38)		(39)
Change in affiliate demand loan payable	(15)		13
Equity issuance, net (Note 7)	381
Long-term debt issued (Note 5)	872		5
Long-term debt repaid (Note 5)	(334)		(55)
Equity contribution from Bison's former parent					18
Distributions paid to former parent of GTN and Bison						(37)	(59)
Total financing activities	710		(262)
Increase/(decrease) in cash and cash equivalents	1		(22)
Cash and cash equivalents, beginning of period	3		29
Cash and cash equivalents, end of period	$ 4		$ 7

[1] (a) Recast as discussed in Note 2 and Note 4.