CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Generated From Operations
Net income	$ 185	$ 157
Depreciation	64	63
Amortization of debt issue costs reported as interest expense (Note 3)	1	1
Equity allowance for funds used during construction		(1)
Change in operating working capital (Note 10)	8	9
Total cash generated from operations	256	229
Investing Activities
Acquisition of the remaining 30 percent interest in GTN		(264)
Capital expenditures	(21)	(45)
Other	3	1
Total investing activities	(165)	(282)
Financing Activities
Distributions paid to non-controlling interests		(9)
Common unit issuance, net	35	26
Common unit issuance subject to rescission, net (Note 7)	83
Equity contribution by the General Partner		2
Long-term debt issued, net of discount (Note 5)	200	598
Long-term debt repaid (Note 5)	(180)	(390)
Debt issuance costs		(3)
Total financing activities	(58)	55
Increase in cash and cash equivalents	33	2
Cash and cash equivalents, beginning of period	39	26
Cash and cash equivalents, end of period	72	28
Class B units
Financing Activities
Distributions paid (Note 7)	(12)
Common units and General Partner interest combined
Financing Activities
Distributions paid (Note 9)	(184)	(169)
Northern Border
Investing Activities
Cumulative distributions in excess of equity earnings	31	18
Great Lakes
Investing Activities
Cumulative distributions in excess of equity earnings	19	12
Investment in Great Lakes / Acquisition of49.9 percent interest in PNGTS (Note 6)	(4)	$ (4)
Portland Natural Gas Transmission System
Cash Generated From Operations
Equity earnings in excess of cumulative distributions	(2)
Investing Activities
Investment in Great Lakes / Acquisition of49.9 percent interest in PNGTS (Note 6)	$ (193)