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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME    
Net income $ 73 $ 64
Other comprehensive income    
Change in fair value of cash flow hedges (Note 12) (2)  
Reclassification to net income of gains and losses on cash flow hedges (Note 12)   (1)
Comprehensive income 71 63
Comprehensive income attributable to non-controlling interests   7
Comprehensive income attributable to controlling interests $ 71 $ 56