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Restructuring and Other - Restructuring Charges by Action/Type (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring Reserve [Abstract]        
Asset impairments and sales $ (3) $ (13) $ (8) $ (6)
Restructuring 3 9 17 15
Transaction costs 0 0 0 22
Other Restructuring Costs 0 3 (50) (3)
Restructuring and other $ 0 $ (1) $ (41) $ 28