CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Cash Generated From Operations
Net income		$ 102	$ 83	[1]
Depreciation		24	24	[1]
Amortization of debt issue costs reported as interest expense		1	1	[1]
Equity earnings from equity investments (Note 5)		(59)	(36)	[1]
Distributions received from operating activities of equity investments (Note 5)		43	28	[1]
Change in operating working capital (Note 11)		6	7	[1]
Net Cash Provided by (Used in) Operating Activities		117	107	[1]
Investing Activities
Distribution received from Iroquois as return of investment (Note 5)		2	0
Capital expenditures		(2)	(7)	[1]
Net Cash Provided by (Used in) Investing Activities		(4)	(11)	[1]
Financing Activities
Distributions paid (Note 10)		(76)	(68)	[1]
Distributions paid to non-controlling interests		(1)	(2)	[1]
Common unit issuance, net (Note 8)		40	71	[1]
Long-term debt issued, net of discount (Note 7)		75
Long-term debt repaid (Note 7)		(101)	(61)	[1]
Total financing activities		(78)	(83)	[1]
Decrease in cash and cash equivalents		(35)	(13)	[1]
Cash and cash equivalents, beginning of period		33	64	[1]
Cash and cash equivalents, end of period		68	77	[1]
Class B Units
Financing Activities
Distributions paid to Class B units (Note 8)		(15)	(22)	[1]
Great Lakes
Cash Generated From Operations
Equity earnings from equity investments (Note 5)		(24)	(17)
Investing Activities
Investment/Acquisition of interests		$ (4)	(4)	[1]
Portland Natural Gas Transmission System
Financing Activities
Distributions paid to former parent of PNGTS	[1]		$ (1)

[1] Recast to consolidate PNGTS (Refer to Note 2).