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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]        
Settlements tax $ (20) $ 10 $ (37) $ 27
Ineffectiveness tax 0 0 0 1
Change in fair value of derivative instruments tax $ 1 $ 4 $ 8 $ (32)