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Restructuring and Other - Restructuring Charges by Action/Type (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Reserve [Abstract]        
Asset impairments and sales $ (13) $ 9 $ (6) $ 3
Restructuring 9 4 15 8
Transaction costs 0 0 22 0
Other Restructuring Costs 3 3 (3) 19
Restructuring and other $ (1) $ 16 $ 28 $ 30