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Operations by Business Segment and Geographic Area - Non-Operating (Income ) Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Corporate general and administrative expense      
Non-Operating Income (Expense)      
Non-operating income (expenses) $ 6 $ (1) $ 7