CONSOLIDATED STATEMENT OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CONSOLIDATED STATEMENT OF INCOME
Transmission revenues	$ 87	$ 86	[1]
Equity earnings from unconsolidated affiliates (Note 3)	33	18	[1]
Operation and maintenance expenses	(12)	(13)	[1]
Property taxes	(6)	(6)	[1]
General and administrative	(2)	(2)	[1]
Depreciation	(21)	(21)	[1]
Financial charges and other	(12)	(9)	[1]
Net income	67	53	[1]
Net income attributable to non-controlling interests	10	10	[1]
Net income attributable to controlling interests	57	43	[1]
Net income attributable to controlling interests allocation (Note 5)
Common units	56	28	[1]
General Partner	1	1	[1]
Net income attributable to controlling interests	$ 57	$ 29	[1]
Net income per common unit (Note 5) - basic (in dollars per unit)	$ 0.90	$ 0.52	[1]
Net income per common unit (Note 5) - diluted (in dollars per unit)	$ 0.90	$ 0.52	[1]
Weighted average common units outstanding (millions) - basic (in units)	62.3	53.5	[1]
Weighted average common units outstanding (millions) - diluted (in units)	62.3	53.5	[1]
Common units outstanding, end of period (millions) (in units)	62.3	53.5	[1]

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