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Restructuring and Other - Restructuring Charges by Action/Type (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring Reserve [Abstract]        
Asset impairments and sales $ 0 $ 0 $ 7 $ (6)
Restructuring 3 2 6 4
Transaction costs 19 0 22 0
Other Restructuring Costs (6) 16 (6) 16
Restructuring and other $ 16 $ 18 $ 29 $ 14