CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Generated From Operations
Net income	$ 244	$ 20	$ 204
Depreciation	86	85	86
Impairment of equity-method investment (Note 4)		199
Amortization of debt issue costs reported as interest expense (Note 11)	2	1	1
Accrual of costs related to acquisition of 49.9% interest in PNGTS (Note 6)		2
Equity earnings from equity investments (Note 4)	(116)	(97)	(88)
Distributed earnings received from equity investments (Note 3)	163	119	115
Equity allowance for funds used during construction		(1)
Change in operating working capital (Note 14)	2	(9)	17
Total cash generated from operations	381	319	335
Investing Activities
Capital expenditures	(28)	(54)	(10)
Other	1	1
Total investing activities	(229)	(326)	(261)
Financing Activities
Distributions paid (Note 13)	(250)	(228)	(212)
Distributions paid to non-controlling interests		(9)	(50)
Common unit issuance, net (Note 9)	84	44	73
Common unit issuance subject to rescission, net (Note 9)	83
Equity contribution by the General Partner (Note 6)		2
Long-term debt issued, net of discount (Note 7)	209	618	35
Short-term loan issued (Note 7)			170
Long-term debt repaid (Note 7)	(254)	(404)	(89)
Debt issuance costs	(1)	(3)
Total financing activities	(141)	20	(73)
Increase/(decrease) in cash and cash equivalents	11	13	1
Cash and cash equivalents, beginning of year	39	26	25
Cash and cash equivalents, end of year	50	39	26
Interest payments made	63	54	47
Supplemental information about non-cash investing and financing activities
Accrual for costs related to construction of GTN's Carty Lateral (Note 14)		10
Issuance of Class B units to TransCanada (Note 9)		95
Class B units
Financing Activities
Distributions paid (Note 9 and 13)	(12)
Bison
Investing Activities
Acquisition of interest			(217)
GTN
Investing Activities
Acquisition of interest		(264)	(25)
Northern Border
Cash Generated From Operations
Equity earnings from equity investments (Note 4)	(69)	(66)	(69)
Great Lakes
Cash Generated From Operations
Equity earnings from equity investments (Note 4)	(28)	(31)	(19)
Investing Activities
Investment/Acquisition of interests (Note 4)	(9)	$ (9)	$ (9)
Portland Natural Gas Transmission System
Cash Generated From Operations
Equity earnings from equity investments (Note 4)	(19)
Portland Natural Gas Transmission System \| GTN
Investing Activities
Acquisition of interest	$ (193)

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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