CONSOLIDATED STATEMENT OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
CONSOLIDATED STATEMENT OF INCOME
Equity earnings from unconsolidated affiliates (Note 4)	$ 22	$ 31	$ 48	$ 69
Transmission revenues	16	16	33	32
Operating expenses	(3)	(4)	(7)	(8)
General and administrative	(4)	(2)	(6)	(4)
Depreciation	(3)	(3)	(6)	(6)
Financial charges and other	(5)	(5)	(10)	(11)
Net income	23	33	52	72
Net income allocation (Note 7)
Common units	23	32	51	70
General Partner		1	1	2
Net income allocated to partners	$ 23	$ 33	$ 52	$ 72
Net income per common unit (Note 7) - basic (in dollars per unit)	$ 0.40	$ 0.60	$ 0.92	$ 1.31
Net income per common unit (Note 7) - diluted (in dollars per unit)	$ 0.40	$ 0.60	$ 0.92	$ 1.31
Weighted average common units outstanding (millions) - basic (in units)	57.4	53.5	55.4	53.5
Weighted average common units outstanding (millions) - diluted (in units)	57.4	53.5	55.4	53.5
Common units outstanding, end of period (millions) (in units)	62.3	53.5	62.3	53.5