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Restructuring and Other - Restructuring Charges by Action/Type (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Reserve [Abstract]        
Asset impairments and sales $ (9) $ 0 $ (5) $ 7
Restructuring 5 3 14 6
Transaction costs 0 19 0 22
Other Restructuring Costs (41) (6) (50) (6)
Restructuring and other $ (45) $ 16 $ (41) $ 29