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Restructuring and Other (Schedule of Restructuring and Other Charges) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring and Related Activities [Abstract]        
Asset impairments and sales   $ (7) $ (5) $ 12
Restructuring   22 25 18
Transaction costs $ 24 0 26 2
Other (income) / costs   (41) (2) 19
Restructuring and other   $ (26) $ 44 $ 51