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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME        
Net income $ 65 $ 55 $ 241 $ 193
Other comprehensive income        
Change in fair value of cash flow hedges (Note 13) 2   8 1
Amortization of realized loss on derivative financial instruments (Note 13)     2 1
Reclassification to net income of gains and losses on cash flow hedges (Note 13) 1 1 4  
Comprehensive income 68 56 255 195
Comprehensive income attributable to non-controlling interests 2 1 11 7
Comprehensive income attributable to controlling interests $ 66 $ 55 $ 244 $ 188