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Restructuring and Other (Schedule of Restructuring and Other Charges) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring and Related Activities [Abstract]      
Asset impairments and sales $ (5) $ 12 $ 14
Restructuring 25 18 12
Transaction costs 26 2 0
Other costs (2) 19 4
Restructuring and other $ 44 $ 51 $ 30