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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS        
Interest expense, capitalized interest $ 12 $ 13 $ 26 $ 27