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Equity Tax amounts in components of other comprehensive income (loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Other Comprehensive Income Loss Commodity Hedges Tax $ (2) $ (2)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax 3 4
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Tax 0 7
Other Comprehensive Income (Loss), Tax $ 1 $ 9