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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS        
Interest expense, capitalized interest $ 6 $ 3 $ 11 $ 9