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Restructuring and Other - Restructuring Charges by Action/Type (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restructuring Reserve [Abstract]    
Asset impairments and sales $ 4 $ 7
Restructuring 9 3
Transaction costs 0 3
Other Restructuring Costs (9) 0
Restructuring and other $ 4 $ 13