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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