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Restructuring and Other (Restructuring and Other Charges) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring and Related Activities [Abstract]      
Asset impairments and sales $ 14 $ 22 $ 70
Restructuring 12 23 21
Transaction costs 0 15 17
Other costs 18 6 21
Restructuring and other $ 44 $ 66 $ 129