CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Transmission revenues	$ 111	$ 101	$ 226	$ 213
Equity earnings (Note 5)	36	24	95	60
Operation and maintenance expenses	(17)	(17)	(33)	(31)
Property taxes	(7)	(7)	(14)	(14)
General and administrative	(1)	(2)	(2)	(4)
Depreciation	(24)	(25)	(48)	(49)
Financial charges and other (Note 15)	(23)	(19)	(46)	(36)
Net income before taxes	75	55	178	139
Income taxes (Note 18)			(1)	(1)
Net income	75	55	177	138
Net income attributable to non-controlling interests	2		8	6
Net income attributable to controlling interests	73	55	169	132
Net income attributable to controlling interest allocation (Note 9)
Net income attributable to common units	72	50	166	122
General Partner	1	5	3	8
TransCanada and its subsidiaries				2
Net income attributable to controlling interests	73	55	169	132
Common Units
Net income attributable to controlling interest allocation (Note 9)
Net income attributable to common units	$ 72	$ 50	$ 166	$ 122
Net income per common unit (Note 9) - basic and diluted (in dollars per unit)	$ 1.00	$ 0.73	$ 2.33	$ 1.78
Weighted average common units outstanding - basic (in units)	71.3	68.9	71.2	68.6
Common units outstanding, end of period	71.3	69.0	71.3	69.0