CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Transmission revenues	$ 89	$ 85	$ 175	$ 172
Equity earnings (Note 4)	22	15	64	46
Operation and maintenance expenses	(12)	(13)	(22)	(24)
Property taxes	(5)	(5)	(10)	(11)
General and administrative	(2)	(1)	(4)	(4)
Depreciation	(22)	(21)	(43)	(42)
Financial charges and other (Note 14)	(16)	(16)	(33)	(29)
Net income	54	44	127	108
Net income attributable to non-controlling interests				7
Net income attributable to controlling interests	54	44	127	101
Net income attributable to controlling interest allocation
General Partner	3	2	5	3
Net income attributable to controlling interests	54	44	127	101
Common units
Net income attributable to controlling interest allocation
Limited partners	$ 50	$ 42	$ 121	$ 98
Net income per common unit (Note 8) - basic (in dollars per unit)	$ 0.76	$ 0.66	$ 1.86	$ 1.53
Net income per common unit (Note 8) - diluted (in dollars per unit)	$ 0.76	$ 0.66	$ 1.86	$ 1.53
Weighted average common units outstanding - basic (in units)	65.5	63.8	64.9	63.7
Weighted average common units outstanding - diluted (in units)	65.5	63.8	64.9	63.7
Common units outstanding, end of period (in units)	65.9	64.0	65.9	64.0
Class B units
Net income attributable to controlling interest allocation
Limited partners	$ 1		$ 1