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Restructuring and Other (Schedule of Restructuring and Other Charges) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring and Related Activities [Abstract]      
Restructuring $ 23 $ 22 $ 25
Other costs / (income) 9 (41) (2)
Asset impairments and sales 2 (7) (5)
Transaction costs 0 0 26
Restructuring and other $ 34 $ (26) $ 44