CONSOLIDATED STATEMENT OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
CONSOLIDATED STATEMENT OF INCOME
Transmission revenues	$ 82	$ 82	[1]	$ 169	$ 168	[1]
Equity earnings from unconsolidated affiliates (Note 4)	18	15	[1]	51	33	[1]
Operation and maintenance expenses	(12)	(13)	[1]	(24)	(26)	[1]
Property taxes	(6)	(6)	[1]	(12)	(12)	[1]
General and administrative	(1)	(4)	[1]	(3)	(6)	[1]
Depreciation	(22)	(22)	[1]	(43)	(43)	[1]
Financial charges and other	(14)	(10)	[1]	(26)	(19)	[1]
Net income	45	42	[1]	112	95	[1]
Net income attributable to non-controlling interests	8	8	[1]	18	17	[1]
Net income attributable to controlling interests	37	34	[1]	94	78	[1]
Net income attributable to controlling interests allocation (Note 6)
Common units	36	23	[1]	92	51	[1]
General Partner	1			2	1	[1]
Net income attributable to controlling interests	$ 37	$ 23	[1]	$ 94	$ 52	[1]
Net income per common unit (Note 6) - basic (in dollars per unit)	$ 0.58	$ 0.40	[1]	$ 1.48	$ 0.92	[1]
Net income per common unit (Note 6) - diluted (in dollars per unit)	$ 0.58	$ 0.40	[1]	$ 1.48	$ 0.92	[1]
Weighted average common units outstanding (millions) - basic (in units)	62.3	57.4	[1]	62.3	55.4	[1]
Weighted average common units outstanding (millions) - diluted (in units)	62.3	57.4	[1]	62.3	55.4	[1]
Common units outstanding, end of period (millions) (in units)	62.3	62.3		62.3	62.3

[1] (a) Recast as discussed in Note 2.