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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME        
Net income $ 46 $ 57 [1] $ 141 [1] $ 176 [1]
Other comprehensive income        
Change in fair value of cash flow hedges(Note 13) (1)   (1)  
Comprehensive income 45 57 140 176
Comprehensive income attributable to non-controlling interests 9 9 [1] 27 [1] 28 [1]
Comprehensive income attributable to controlling interests $ 36 $ 48 $ 113 $ 148
[1] (a) Recast as discussed in Note 2 and Note 4.