CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Transmission revenues, net (Notes 4 and 6)	$ 103	$ 100	$ 328	$ 313
Equity earnings (Note 5)	34	27	129	87
Operation and maintenance expenses	(15)	(16)	(48)	(47)
Property taxes	(7)	(7)	(21)	(21)
General and administrative	(2)	(1)	(4)	(6)
Depreciation	(25)	(25)	(73)	(73)
Financial charges and other (Note 15)	(23)	(23)	(69)	(59)
Net income before taxes	65	55	242	194
Income taxes (Note 18)			(1)	(1)
Net income	65	55	241	193
Net income attributable to non-controlling interests	3	1	10	7
Net income attributable to controlling interests	62	54	231	186
Net income attributable to controlling interest allocation (Note 9)
General Partner	1	4	5	12
TransCanada and its subsidiaries	4	8	4	10
Net income attributable to controlling interests	62	54	231	186
Common Units
Net income attributable to controlling interest allocation (Note 9)
Net income attributable to common units	$ 57	$ 42	$ 222	$ 164
Net income per common unit (Note 9) - basic and diluted (in dollars per unit)	$ 0.79	$ 0.61	$ 3.11	$ 2.38
Weighted average common units outstanding - basic (in units)	71.3	69.4	71.3	68.9
Common units outstanding, end of period	71.3	69.6	71.3	69.6