CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Transmission revenues		$ 115	$ 112	[1]
Equity earnings (Note 5)		59	36	[1]
Operation and maintenance expenses		(16)	(14)	[1]
Property taxes		(7)	(7)	[1]
General and administrative		(1)	(2)	[1]
Depreciation and amortization		(24)	(24)	[1]
Financial charges and other (Note 15)		(23)	(17)	[1]
Net income before taxes		103	84	[1]
Income taxes (Note 18)		(1)	(1)	[1]
Net Income		102	83	[1]
Net income attributable to non-controlling interest		6	6	[1]
Net income attributable to controlling interests		96	77	[1]
Net income attributable to controlling interest allocation (Note 9)
General Partner		2	3	[1]
TransCanada, as former parent of PNGTS	[1]		2
Net income attributable to controlling interests		96	77	[1]
Common Units
Net income attributable to controlling interest allocation (Note 9)
Net income attributable to common units		$ 94	$ 72	[1]
Net income per common unit (Note 9) - basic and diluted (in dollars per unit)	[2]	$ 1.32	$ 1.05	[1]
Weighted average common units outstanding - basic (in units)		71.2	68.3	[1]
Common units outstanding, end of period		71.3	68.6	[1]

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

[2] Net income per common unit prior to recast (Refer to Note 2).