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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income tax expense (benefit) of $0, $5, ($1) and $4 on unrealized gains (losses) on derivative instruments $ 0 $ 5 $ (1) $ 4
Income tax expense (benefit) of $0, $2, $3 and $11 on reclassification of (gains) losses on settled derivative instruments $ 0 $ 2 $ 3 $ 11