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Restructuring and Other (Restructuring Charges by Action/Type) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Restructuring Reserve [Abstract]        
Asset impairments and sales $ 4 $ 14 $ (3) $ 15
Restructuring 7 20 10 21
Transaction costs 0 0 0 15
Other costs 9 6 12 6
Restructuring and other $ 20 $ 40 $ 19 $ 57