CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Transmission revenues	$ 85	$ 82	$ 172	$ 169
Equity earnings from unconsolidated affiliates (Note 4)	15	18	46	51
Operation and maintenance expenses	(13)	(12)	(24)	(24)
Property taxes	(5)	(6)	(11)	(12)
General and administrative	(1)	(1)	(4)	(3)
Depreciation	(21)	(22)	(42)	(43)
Financial charges and other	(16)	(14)	(29)	(26)
Net income	44	45	108	112
Net income attributable to non-controlling interests		8	7	18
Net income attributable to controlling interests	44	37	101	94
Calculation of net income attributable to common units
Net income attributable to controlling interests	44	37	101	94
Less: Net income allocated to the General Partner, including incentive distributions	2	1	3	2
Common units
Calculation of net income attributable to common units
Net Income allocated to common units (Note 8)	$ 42	$ 36	$ 98	$ 92
Weighted average common units outstanding (millions) - basic (in units)	63.8	62.3	63.7	62.3
Weighted average common units outstanding (millions) - diluted (in units)	63.8	62.3	63.7	62.3
Net income per common unit (Note 8) - basic (in dollars per unit)	$ 0.66	$ 0.58	$ 1.53	$ 1.48
Net income per common unit (Note 8) - diluted (in dollars per unit)	$ 0.66	$ 0.58	$ 1.53	$ 1.48
Common units outstanding, end of period (millions) (in units)	64.0	62.3	64.0	62.3