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Equity Tax amounts in components of other comprehensive income (loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Other Comprehensive Income Loss Commodity Hedges Tax $ (2) $ (2)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax 3 3
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Tax 3 0
Other Comprehensive Income (Loss), Tax $ 4 $ 1